562 results on '"CuInS2"'
Search Results
2. A highly sensitive photoelectrochemical aptsensor based on photocathode CuInS2 for the detection of tobramycin
- Author
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Wang, Mengyan, Liu, Jinzhi, Zhang, Chi, Li, Gaiping, Ye, Baoxian, and Zou, Lina
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- 2022
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Catalog
3. Fabricating WS2/Mn0.5Cd0.5S/CuInS2 hierarchical tandem p-n heterojunction for highly efficient hydrogen production
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Lv, Hua, Wu, Hao, Wu, Xinxin, Zheng, JinZe, and Liu, Yumin
- Published
- 2022
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4. Iron-copper bimetallic photo-Fenton system promoted photothermal-hydrogen peroxide production for efficient low-temperature wastewater treatment.
- Author
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Ren, Bo, Xing, Zipeng, Zhang, Na, Cheng, Tao, Liu, Xinyue, Chen, Weizi, Wang, Zibin, Li, Zhenzi, and Zhou, Wei
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ELECTRON paramagnetic resonance spectroscopy , *X-ray photoelectron spectroscopy , *WASTEWATER treatment , *HETEROJUNCTIONS , *HYDROGEN production , *HYDROGEN peroxide - Abstract
NH 2 -MIL-88B(Fe)/CuInS 2 S-scheme heterojunction as iron-copper bimetallic photo-Fenton system is fabricated via a straightforward hydrothermal process. It shows excellent photothermal-photocatalytic Fenton property for degradation of tetracycline in low-temperature wastewaters, due to the synergistic effect of bimetallic codoped Fenton system and formation of S-scheme heterojunction. [Display omitted] Enhancing the velocity of the oxidation–reduction cycle is crucial for improving the catalytic efficiency of Fenton processes. Therefore, the development of an effective strategy for wastewater degradation at low temperatures is essential. In this context, we present the preparation of an NH 2 -MIL-88B (Fe)/CuInS 2 S-scheme heterojunction. Specifically, CuInS 2 nanoparticles are introduced onto the Ferro-organic skeleton, resulting in the exposure of a significant number of active surface sites. Furthermore, NH 2 -MIL-88B (Fe)/CuInS 2 demonstrates an extended photoresponse into the long-wavelength region, which contributes to its excellent photothermal properties. Notably, the degradation rate of tetracycline in low-temperature aqueous environments reaches as high as 99.7 %, several times higher than that of the original sample. Additionally, the hydrogen production of NH 2 -MIL-88B (Fe)/CuInS 2 is 2.23 times that of single NH 2 -MIL-88B (Fe) and 3.46 times that of single CuInS 2. Moreover, the system exhibits good H 2 O 2 evolution performance, forming an efficient photo-Fenton system. The charge transfer process in S-scheme heterojunction is confirmed using in-situ X-ray photoelectron spectroscopy and electron paramagnetic resonance. Both transient photoluminescence and photo electrochemical tests further validate the enhanced photoelectrochemical properties of the NH 2 -MIL-88B (Fe)/CuInS 2 S-scheme heterojunction. The exceptional performance of this system can be attributed to the synergistic effects of the S-scheme heterojunction and the bimetallic codoped photo-Fenton system. This research presents a novel approach for the breakdown of low-temperature wastewater using an improved photocatalytic Fenton system. [ABSTRACT FROM AUTHOR] more...
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- 2025
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5. Investigation of Grain Growth in Chalcopyrite CuInS2 Photoelectrodes Synthesized under Wet Chemical Conditions for Bias‐Free Photoelectrochemical Water Splitting.
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Chae, Sang Youn, Yoon, Noyoung, Jun, Minki, Hur, Sung Hyun, Lee, Myeongjae, Kim, BongSoo, Kim, Jin Young, Park, Eun Duck, Park, Jong Hyeok, and Joo, Oh Shim
- Subjects
GREEN fuels ,SEMICONDUCTORS ,SEMICONDUCTOR materials ,PHOTOELECTROCHEMICAL cells ,SPIN coating ,PHOTOCATHODES - Abstract
Photoelectrochemical (PEC) cells offer a promising method for producing green hydrogen through the splitting of water using solar energy. However, the cost‐effective synthesis of highly crystalline p‐type semiconductor materials for PEC cells remains a significant challenge for industrial applications. Herein, a CuInS2 photoelectrode is fabricated using a scalable and economical wet chemical spin‐coating technique. To enhance the crystallinity and photoelectrochemical activity of the photoelectrode, the grain size is precisely controlled by adjusting the atomic ratio, thickness, morphology, and Ag doping. Evaluating a novel growth mechanism of CuInS2 from Cu–In–O reveals that Ag doping significantly promotes grain growth. Consequently, the CuInS2 photocathode achieves one of the highest photoelectrochemical activities (−9.8 mA cm−2 at 0 VRHE) reported for CuInS2 photoelectrodes synthesized via wet chemical methods. Bias‐free water splitting is achieved using a CuInS2‐based photoelectrode in a photovoltaic–PEC cell configuration. These results highlight the potential of CuInS2, prepared through wet chemical methods, for cost‐effective photoelectrochemical water splitting. [ABSTRACT FROM AUTHOR] more...
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- 2024
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6. CuS/CuInS2/TiO2 ile Fotokatalitik Hidrojen Üretimi: Fotokatalizör Sentez Yönteminin Etkisi.
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KUYUMCU, Özge KERKEZ
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HYDROGEN production ,FEDERAL aid to renewable energy ,SOLAR energy ,PHOTOCATALYSTS ,IN situ (Civil engineering) - Abstract
Copyright of International Journal of Advances in Engineering & Pure Sciences is the property of Marmara University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
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- 2024
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7. Microwave-assisted synthesis of ZnS@CuInxSy for photocatalytic degradation of coloured and non-coloured pollutants
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Ashmalina Rahman, Fazlurrahman Khan, James Robert Jennings, Young-Mog Kim, and Mohammad Mansoob Khan
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Copper indium sulfide ,Copper sulfide ,Zinc sulfide ,CuInS2 ,CuS ,ZnS ,Medicine ,Science - Abstract
Abstract Copper indium sulfide (CuInS2) exhibits strong visible light absorption and thus has the potential for good photocatalytic activity; however, rapid charge recombination limits its practical usage. An intriguing strategy to overcome this issue is to couple CuInS2 with another semiconductor to form a heterojunction, which can improve the charge carrier separation and, hence, enhance the photocatalytic activity. In this study, photocatalysts comprising CuInS2 with a secondary CuS phase (termed CuInxSy) and CuInxSy loaded with ZnS (termed ZnS@CuInxSy) were synthesized via a microwave-assisted method. Structural and morphological characterization revealed that the ZnS@CuInxSy photocatalyst comprised tetragonal CuInS2 containing a secondary phase of hexagonal CuS, coupled with hexagonal ZnS. The effective band gap energy of CuInxSy was widened from 2.23 to 2.71 as the ZnS loading increased from 0 to 30%. The coupling of CuInxSy with ZnS leads to long-lived charge carriers and efficient visible-light harvesting properties, which in turn lead to a remarkably high activity for the photocatalytic degradation of brilliant green (95.6% in 5 h) and conversion of 4-nitrophenol to 4-nitrophenolate ions (95.4% in 5 h). The active species involved in these photocatalytic processes were evaluated using suitable trapping agents. Based on the obtained results, photocatalytic mechanisms are proposed that emphasize the importance of h+, O2 •–, and OH− in photocatalytic processes using ZnS@CuInxSy. more...
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- 2024
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8. Regulation of ZnO/CuInS2 Nanostructure and Improvement of Its Photocatalytic Hydrogen Production Performance.
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Zhou, Taihang, Qiao, Fen, and Liu, Yanzhen
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HYDROGEN production , *INTERSTITIAL hydrogen generation , *ELECTRON-hole recombination , *ELECTRICAL energy , *CHARGE exchange - Abstract
To address the constraints of CuInS2 in photocatalytic applications, ZnO was synthesized using the sol–gel technique, along with the in-situ hydrothermal method to acquire the ZnO/CuInS2 heterojunction photocatalyst. Comparisons with the pure CuInS2 monomer revealed that the fabricated composites demonstrated significant improvement in photocatalytic hydrogen production under simulated sunlight exposures. The optimal hydrogen production rate reached approximately 31-fold that of CuInS2 alone. The improved photocatalytic activity of ZnO/CuInS2 can be attributed to the successful formation of the heterojunction, which facilitates the effective transfer of electrons induced by light at the interface. Moreover, the composite photocatalyst significantly reduces electron–hole recombination resulting in efficient conversion of light energy to electrical energy. This study improves the performance of photocatalytic hydrogen production performance in CuInS2, providing a valuable reference for the development of photocatalytic hydrogen production catalysts. [ABSTRACT FROM AUTHOR] more...
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- 2024
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9. Comparative Study on the Effect of Precursors on the Morphology and Optical Properties of CuInS2 Nanoparticles
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Ben Belgacem, J., Ben Belgacem, I., Nouiri, M., Ben Ayadi, Z., Djessas, K., Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Bouraoui, Tarak, editor, Ben Moussa, Naoufel, editor, Zemzemi, Farhat, editor, Benameur, Tarek, editor, Aifaoui, Nizar, editor, Znaidi, Amna, editor, Mzali, Slah, editor, Ennetta, Ridha, editor, and Djemal, Fathi, editor more...
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- 2024
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10. Comparative study of interfacial charge transfer at the junction between CuInS2:In2S3/g-C3N4 photocatalysts for sacrificial hydrogen evolution activity.
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Golda A, Shiny, Shaheer, A.R. Mahammed, Neppolian, Bernaurdshaw, and Lakhera, Sandeep Kumar
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CHARGE transfer , *HYDROGEN evolution reactions , *PHOTOCATALYSTS , *RENEWABLE energy sources , *ELECTRON-hole recombination , *HYDROGEN production - Abstract
The quest for sustainable and efficient renewable energy sources has escalated in recent years, with photocatalytic hydrogen production gaining prominence due to its potential to harness solar energy for clean fuel generation. In this study, we design 2D/2D heterostructure CuInS 2 :In 2 S 3 /g-C 3 N 4 nanosheets utilizing electrostatic interaction for hydrogen evolution reaction under visible light irradiation. Integrating CuInS 2 :In 2 S 3 and g-C 3 N 4 layers to form an interfacial 2D:2D heterostructure results in a broad light absorption range, effective charge separation, and excellent stability. The heterostructure ensures efficient interfacial charge transfer pathways, mitigating electron-hole recombination and promoting hydrogen evolution. The hybrid nanosheets prepared with the hydrothermal method exhibited ∼40-fold synergistic enhancement in hydrogen production and long-term stability. The synergistic boost in activity resulted from the formation of S-scheme heterojunctions (CuInS 2 /g-C 3 N 4 and CuInS 2 /In 2 S 3) within hybrid nanosheets. [Display omitted] • CuInS 2 :In 2 S 3 /g-C 3 N 4 (CNCIS) nanosheets were synthesized using methods like self-assembly, photoreduction, and hydrothermal. • The CNCIS photocatalyst produced hydrogen at a rate of 917 μmol/h/g when TEOA was used as the sacrificial agent. • The composite CNCIS achieved a 40-fold synergistic boost in H 2 production compared to its individual components CN and CIS. • A dual S-Scheme heterojunction charge transfer mechanism is proposed. [ABSTRACT FROM AUTHOR] more...
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- 2024
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11. Optical and Optoelectrical Properties of Ternary Chalcogenide CuInS 2 /TiO 2 Nanocomposite Prepared by Mechanochemical Synthesis.
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Dutkova, Erika, Baláž, Matej, Kováč, Jaroslav, Daneu, Nina, Kashimbetova, Adelia, Briančin, Jaroslav, Kováč Jr., Jaroslav, Kováčová, Soňa, and Čelko, Ladislav
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OPTICAL properties ,NANOCOMPOSITE materials ,CHALCOGENIDES ,RAMAN spectroscopy ,PHOTOSENSITIVITY ,RUTILE - Abstract
In this work, a nanocomposite consisting of ternary chalcogenide CuInS
2 and TiO2 was prepared and its optical and optoelectrical properties were investigated. The CuInS2 /TiO2 nanocomposite was produced via one-step mechanochemical synthesis and characterized from the crystal structure, microstructural, morphology, surface, optical, and optoelectrical properties viewpoints. X-ray diffraction confirmed the presence of both components, CuInS2 and TiO2 , in the nanocomposite and revealed a partial transformation of anatase to rutile. The presence of both components in the samples was also proven by Raman spectroscopy. HRTEM confirmed the nanocrystalline character of the samples as crystallites ranging from around 10 nm and up to a few tens of nanometers were found. The presence of the agglomerated nanoparticles into larger grains was proven by SEM. The measured optical properties of CuInS2 , TiO2 , and CuInS2 /TiO2 nanocomposites demonstrate optical bandgaps of ~1.62 eV for CuInS2 and 3.26 eV for TiO2 . The measurement of the optoelectrical properties showed that the presence of TiO2 in the CuInS2 /TiO2 nanocomposite increased its conductivity and modified the photosensitivity depending on the ratio of the components. This study has demonstrated the possibility of preparing a CuInS2 /TiO2 nanocomposite material with promising applications in optoelectronics in the visible region in an eco-friendly manner. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
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12. Modification of carnation-like CuInS2 with Cu-MOF nanoparticles for efficient photocatalytic hydrogen production.
- Author
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Zhang, Weijie, Wei, Kai, Fan, Lufang, Song, Ziheng, Han, Huarui, Wang, Qianyu, Song, Shushan, Liu, Dandan, and Feng, Sheng
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HYDROGEN production , *HYDROGEN evolution reactions , *CONDUCTION electrons , *CONDUCTION bands , *PHOTOELECTRON spectroscopy , *LIGHT absorption , *CHARGE carriers - Abstract
In this study, Cu-MOF nanoparticles were synthesized and anchored on the surface of carnation-like CuInS 2 (CIS) for efficient hydrogen evolution. The floral structure of CIS could significantly improve the light absorption performance. Under light irradiation, the built-in electric field at the interface between CIS and Cu-MOF drove the photogenerated electrons at the conduction band of Cu-MOF fleetly recombined with the holes at the valent band of CIS. Consequently, the powerful photogenerated electrons at the conduction band of CIS worked on proton reduction. This S-scheme photogenerated charge transfer route was decoded through in-situ XPS, energy band structure analysis, ultraviolet photoelectron spectroscopy, and density functional theory (DFT) calculation. Benefiting from robust reduction capacity and enhanced light absorption performance, the hydrogen evolution efficiency of the optimized Cu-MOF/CIS was up to 1013.35 μmol g−1 h−1, 6.56 and 9.56 times that of CuInS 2 and Cu-MOF, respectively, and the apparent quantum efficiency (AQY) reached 15% at 420 nm. This study provides an efficient strategy for photocatalyst design by coupling S-scheme and morphology control. [Display omitted] • Carnation-like CIS/Cu-MOF was successfully prepared by an in situ growth method. • The CIS/Cu-MOF electron migration is following the S-scheme heterojunction route. • Carnation-like CuInS 2 improves the light absorption range. • CIS/Cu-MOF improves photocatalytic hydrogen production performance with good stability. [ABSTRACT FROM AUTHOR] more...
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- 2024
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13. Studies of Undoped and Doped Films of CuInS2.
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Sengupta, Sumita and Pateria, Mimi Akash
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OPTICAL measurements , *RARE earth oxides , *X-ray diffraction , *THIN films , *HOLMIUM , *SCANNING electron microscopy , *CHALCOPYRITE - Abstract
To find out the effect of the rare earth doping element Holmium (Ho) on CuInS2 thin films, various studies have been carried out and the results have been reported in this paper. The PL study shows that intensity of doped film is more than undoped film. The PL emission peak appears at 570–580 nm. SEM images of CIS:Ho (4 ml) film shows agglomeration on the surface. Both synthesized film of CuInS2 appears to be amorphous in nature with chalcopyrite structure as clear from XRD. Hall measurement and optical studies were also performed. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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14. Studies of Undoped and Doped Films of CuInS2.
- Author
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Sengupta, Sumita and Pateria, Mimi Akash
- Subjects
OPTICAL measurements ,RARE earth oxides ,X-ray diffraction ,THIN films ,HOLMIUM ,SCANNING electron microscopy ,CHALCOPYRITE - Abstract
To find out the effect of the rare earth doping element Holmium (Ho) on CuInS
2 thin films, various studies have been carried out and the results have been reported in this paper. The PL study shows that intensity of doped film is more than undoped film. The PL emission peak appears at 570–580 nm. SEM images of CIS:Ho (4 ml) film shows agglomeration on the surface. Both synthesized film of CuInS2 appears to be amorphous in nature with chalcopyrite structure as clear from XRD. Hall measurement and optical studies were also performed. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
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15. Electro-optical characterization of rare earth doped CuInS2 thin films synthesized by CBD.
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Sengupta, S.
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THIN films , *RARE earth metals , *SAMARIUM , *BAND gaps , *CANNABIDIOL , *CHEMICAL solution deposition - Abstract
This work aims to study the electrical and optical properties of CuInS2 thin films to see the impact of rare earth doping on the properties of films obtained by Chemical bath deposition (CBD) in alkaline medium at 80 °C bath temperature. The observed and calculated lattice parameters are in good agreement with each other as confirmed from structural studies. Hall mobility and other parameters were calculated. The mobility of Pr doped film was quite high. E = hν = hc λ has been used to calculate the band gaps of various doped films of CuInS2. It is found that band gap is low for Sm doped film. This could be due to small particle size. Presence of dopant has been confirmed from EDS. PC studies has been done to know about the possible states in band gap. The photoconductive gain is high in Sm doped film. The emission spectrum were recorded for the wavelength 300–1000nm. The peak sharpness in terms of intensity is very high in Sm doped films. Spherical shape particles are prominently appeared on the surface of the film. [ABSTRACT FROM AUTHOR] more...
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- 2024
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16. A signal polarity conversion photoelectrochemical immunosensor for neuron-specific enolase detection based on MgIn2S4-sensitized CsPbBr3.
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Xu, Kun, Dai, Li, Du, Yu, Liu, Lei, Zhang, Nuo, Feng, Ruiqing, Xu, Rui, and Wei, Qin
- Subjects
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ENOLASE , *ANALYTICAL chemistry , *BAND gaps , *DETECTION limit , *OPTICAL properties - Abstract
A photoelectrochemical (PEC) immunosensor was designed based on MgIn2S4-decorated inorganic halide perovskite CsPbBr3 combined with the signal polarity conversion strategy for neuron-specific enolase (NSE) detection. CsPbBr3 was applied as the basic photoactive material owing to its excellent optical and electronic properties, which provide a good PEC performance for sensor construction. In order to improve the stability of this perovskite, the three-dimensional flower-like MgIn2S4 with a desirable direct band gap was applied to enhance the PEC response. Also, the excellent structure of MgIn2S4 provides large surface-active sites for CsPbBr3 loaded. For enhancing the detection sensitivity of PEC immunosensor, p-type CuInS2 was used as a signal probe which fixed on detection antibody (Ab2). When the target NSE was present, the photogenerated electrons produced by CuInS2 were transferred to the test solution, and the polarity of PEC signal changes. Based on the above photosensitive materials and signal conversion strategy, the proposed PEC immunosensor showed favorable detection performance, and the linear detection range is 0.0001 ~ 100 ng/mL with a 38 fg/mL of detection limit. The proposed strategy improved the adhibition of CsPbBr3 in the analytical chemistry field as well as provided a reference method for other protein detections. [ABSTRACT FROM AUTHOR] more...
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- 2024
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17. A signal polarity conversion photoelectrochemical immunosensor for neuron-specific enolase detection based on MgIn2S4-sensitized CsPbBr3.
- Author
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Xu, Kun, Dai, Li, Du, Yu, Liu, Lei, Zhang, Nuo, Feng, Ruiqing, Xu, Rui, and Wei, Qin
- Subjects
ENOLASE ,ANALYTICAL chemistry ,BAND gaps ,DETECTION limit ,OPTICAL properties - Abstract
A photoelectrochemical (PEC) immunosensor was designed based on MgIn
2 S4 -decorated inorganic halide perovskite CsPbBr3 combined with the signal polarity conversion strategy for neuron-specific enolase (NSE) detection. CsPbBr3 was applied as the basic photoactive material owing to its excellent optical and electronic properties, which provide a good PEC performance for sensor construction. In order to improve the stability of this perovskite, the three-dimensional flower-like MgIn2 S4 with a desirable direct band gap was applied to enhance the PEC response. Also, the excellent structure of MgIn2 S4 provides large surface-active sites for CsPbBr3 loaded. For enhancing the detection sensitivity of PEC immunosensor, p-type CuInS2 was used as a signal probe which fixed on detection antibody (Ab2 ). When the target NSE was present, the photogenerated electrons produced by CuInS2 were transferred to the test solution, and the polarity of PEC signal changes. Based on the above photosensitive materials and signal conversion strategy, the proposed PEC immunosensor showed favorable detection performance, and the linear detection range is 0.0001 ~ 100 ng/mL with a 38 fg/mL of detection limit. The proposed strategy improved the adhibition of CsPbBr3 in the analytical chemistry field as well as provided a reference method for other protein detections. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
18. Studies of Undoped and Doped Films of CuInS2.
- Author
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Sengupta, Sumita and Pateria, Mimi Akash
- Abstract
To find out the effect of the rare earth doping element Holmium (Ho) on CuInS
2 thin films, various studies have been carried out and the results have been reported in this paper. The PL study shows that intensity of doped film is more than undoped film. The PL emission peak appears at 570–580 nm. SEM images of CIS:Ho (4 ml) film shows agglomeration on the surface. Both synthesized film of CuInS2 appears to be amorphous in nature with chalcopyrite structure as clear from XRD. Hall measurement and optical studies were also performed. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
19. Temperature- and Size-Dependent Photoluminescence of CuInS 2 Quantum Dots.
- Author
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Korepanov, Oleg, Kozodaev, Dmitriy, Aleksandrova, Olga, Bugrov, Alexander, Firsov, Dmitrii, Kirilenko, Demid, Mazing, Dmitriy, Moshnikov, Vyacheslav, and Shomakhov, Zamir
- Subjects
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QUANTUM dots , *PHOTOLUMINESCENCE , *TRANSMISSION electron microscopy , *NANOPARTICLES - Abstract
We present the results of a temperature-dependent photoluminescence (PL) spectroscopy study on CuInS2 quantum dots (QDs). In order to elucidate the influence of QD size on PL temperature dependence, size-selective precipitation was used to obtain several nanoparticle fractions. Additionally, the nanoparticles' morphology and chemical composition were studied using transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The obtained QDs showed luminescence in the visible–near infrared range. The PL energy, linewidth, and intensity were studied within an 11–300 K interval. For all fractions, a temperature decrease led to a shift in the emission maximum to higher energies and pronounced growth of the PL intensity down to 75–100 K. It was found that for large particle fractions, the PL intensity started to decrease, with temperature decreasing below 75 K, while the PL intensity of small nanoparticles remained stable. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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20. Copper Indium Sulfide Quantum Dots as Nanomanometers: Influence of Size and Composition
- Author
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Leyre Aldaz‐Caballero, Ulises R. Rodríguez‐Mendoza, Víctor Lavín, Patrizia Canton, Antonio Benayas, and Riccardo Marin
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CuInS2 ,luminescence ,nanomanometry ,pressure sensing ,quantum dots ,Technology (General) ,T1-995 ,Science - Abstract
Abstract Mechanical forces control the function of organisms and mediate the interaction between biological systems and their environments. Knowledge of these forces will increase the understanding of biological processes and can support the development of novel diagnostic and therapeutic procedures. Although techniques like atomic force microscopy and droplet insertion method allow measuring forces over a broad range of values, they are invasive and lack versatility. A promising way to overcome these hurdles is luminescent nanomanometry. Quantum dots (QDs) specifically have optical properties that depend on their size because of the quantum confinement, which makes them responsive to applied forces. Yet, a fine understanding of how fundamental parameters affect the response to applied stress is required before a QD family can be credibly proposed as luminescent nanomanometers. Here, a thorough study is conducted on how size and stoichiometry affect the nanomanometry performance of CuInS2 QDs. The studied QDs feature pressure‐dependent photoluminescence in the red/near‐infrared range, which can enable the measurement of mechanical forces in the range of physiological relevance in a remote and minimally invasive way. It is shown that tuning size and stoichiometry can simultaneously enhance the CuInS2 QDs’ brightness and response to applied pressure, thus providing guidelines for better luminescent nanomanometers. more...
- Published
- 2023
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21. Preparation and Structural Characterization of Thin Films of CuInS2 by Sintering Colloidally Synthesized Nanoparticles at Moderate Temperature.
- Author
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Reinhold, Harald, Mikolajczak, Ulf, Borchert, Holger, Parisi, Jürgen, and Scheunemann, Dorothea
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THIN films , *SEMICONDUCTOR nanoparticles , *THIN film deposition , *SINTERING , *COPPER , *ORGANIC semiconductors - Abstract
Copper indium disulfide nanoparticles continue attracting attention as absorber material in light harvesting devices. The preparation of thin films by deposition of this material from colloidal solution remains challenging. Typically, colloidal semiconductor nanoparticles are surrounded by long organic ligand molecules which are required to stabilize the particles during synthesis. A common way to obtain conductive thin films is the development of ligand exchange procedures that need to be applied prior to film deposition. However, in the case of copper indium disulfide nanoparticles, appropriate procedures are still missing. Therefore, an alternative approach is investigated herein. Colloidal copper indium disulfide nanoparticles are synthesized and deposited on substrates. Instead of applying a ligand exchange procedure, thermal removal of the ligands and sintering of the inorganic film are explored. Results on the preparation of the nanoparticle films, their structural investigation, and conductivity measurements are reported. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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22. Improving Organic Photovoltaic Efficiency via Heterophase Homojunction Copper Indium Sulfide Nanocrystals.
- Author
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Du, Zhonglin, Yu, Ting, He, Wanting, Yurtsever, Aycan, Izquierdo, Ricardo, and Ma, Dongling
- Subjects
COPPER sulfide ,CHARGE carriers ,CHARGE transfer ,SOLAR cells ,NANOCRYSTALS ,QUANTUM dots - Abstract
Eco‐friendly heterophase homojunction copper indium sulfide quantum dots (HH‐CIS QDs) terminated by short hydroxyl ligands are integrated into nonfullerene organic solar cells (OSCs) for the first time. Experimental results exhibit that this novel nanostructure can improve sunlight absorption and charge transfer ability, harvesting more photons and converting them to charge carriers. Additionally, the formation of hydrogen bonds between 2‐mercaptoethanol‐capped HH‐CIS QDs and the interface modification layer is beneficial for better interfacial contact, which promotes work function modification, reduces surface roughness, and increases interfacial charge transfer. Benefiting from HH‐CIS QDs incorporation, nonfullerene OSCs involving two different types of photoactive layers and three different types of electron transport layers all demonstrate improved photoelectric conversion efficiency (PCE). With QDs concentration optimization, nonfullerene OSCs with the PM6:ITIC‐4F and PM6:Y6 absorbers exhibit excellent PCEs of 14.04% and 16.26%, respectively. As compared to those reported previously, HH‐CIS QDs into the interface between the electron charge layer and photoactive layer lead to significant performance improvement, with both achieve PCEs and enhancement factors among the highest ones reported for various QD‐integrated OSCs. The results strongly suggest that the rational design of QDs and their optimal integration are critical for performance enhancement. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
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23. Copper indium sulfide quantum dots in photocatalysis.
- Author
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Zhang, Jingjing, Bifulco, Aurelio, Amato, Paola, Imparato, Claudio, and Qi, Kezhen
- Subjects
- *
QUANTUM dots , *CHEMICAL energy conversion , *COPPER sulfide , *PHOTOCATALYSIS , *SOLAR energy conversion , *ENERGY conversion , *LEAD sulfide - Abstract
[Display omitted] • Copper indium sulfide QDs are emerging as versatile visible-light photocatalysts. • Different synthesis methods determine the properties and performances. • Modification strategies such as heterojunction formation improve the activity. • Excellent results in photocatalytic degradation, H 2 production and CO 2 reduction. • Promising prospects for future development and wider applications. Since the advent of photocatalytic technology, scientists have been searching for semiconductor materials with high efficiency in solar energy utilization and conversion to chemical energy. Recently, the development of quantum dot (QD) photocatalysts has attracted much attention because of their unique characteristics: small size, quantum effects, strong surface activity, and wide photoresponse range. Among ternary chalcogenide semiconductors, CuInS 2 QDs are increasingly examined in the field of photocatalysis due to their high absorption coefficients, good matching of the absorption range with sunlight spectrum, long lifetimes of photogenerated electron-hole pairs and environmental sustainability. In this review paper, the structural and electronic properties, synthesis methods and various photocatalytic applications of CuInS 2 QDs are systematically expounded. The current research status on the photocatalytic properties of materials based on CuInS 2 QD is discussed combined with the existing modification approaches for the enhancement of their performances. Future challenges and new development opportunities of CuInS 2 QDs in the field of photocatalysis are then prospected. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
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24. Optical and Optoelectrical Properties of Ternary Chalcogenide CuInS2/TiO2 Nanocomposite Prepared by Mechanochemical Synthesis
- Author
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Erika Dutkova, Matej Baláž, Jaroslav Kováč, Nina Daneu, Adelia Kashimbetova, Jaroslav Briančin, Soňa Kováčová, and Ladislav Čelko
- Subjects
CuInS2 ,TiO2 ,mechanochemistry ,nanocomposite ,optical properties ,optoelectrical properties ,Crystallography ,QD901-999 - Abstract
In this work, a nanocomposite consisting of ternary chalcogenide CuInS2 and TiO2 was prepared and its optical and optoelectrical properties were investigated. The CuInS2/TiO2 nanocomposite was produced via one-step mechanochemical synthesis and characterized from the crystal structure, microstructural, morphology, surface, optical, and optoelectrical properties viewpoints. X-ray diffraction confirmed the presence of both components, CuInS2 and TiO2, in the nanocomposite and revealed a partial transformation of anatase to rutile. The presence of both components in the samples was also proven by Raman spectroscopy. HRTEM confirmed the nanocrystalline character of the samples as crystallites ranging from around 10 nm and up to a few tens of nanometers were found. The presence of the agglomerated nanoparticles into larger grains was proven by SEM. The measured optical properties of CuInS2, TiO2, and CuInS2/TiO2 nanocomposites demonstrate optical bandgaps of ~1.62 eV for CuInS2 and 3.26 eV for TiO2. The measurement of the optoelectrical properties showed that the presence of TiO2 in the CuInS2/TiO2 nanocomposite increased its conductivity and modified the photosensitivity depending on the ratio of the components. This study has demonstrated the possibility of preparing a CuInS2/TiO2 nanocomposite material with promising applications in optoelectronics in the visible region in an eco-friendly manner. more...
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- 2024
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25. Monitoring Transformations of Catalytic Active States in Photocathodes Based on MoSx Layers on CuInS2 Using In Operando Raman Spectroscopy.
- Author
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Chae, Sang Youn, Yoon, Noyoung, Joo, Oh shim, and Park, Eun Duck
- Subjects
- *
PHOTOCATHODES , *RAMAN spectroscopy , *X-ray photoelectron spectroscopy , *CHARGE transfer , *CHARGE carriers - Abstract
The electrochemical activation of CuInS2/MoSx for photoelectrochemical (PEC) H2 production was revealed for the first time through in operando Raman spectroscopy. During the activation process, the initial metallic MoSx phase was transformed to semiconducting MoSx, which facilitates charge carrier transfer between CuInS2 and MoSx. Ex situ X‐ray photoelectron spectroscopy and Raman spectroscopy suggest the existence of MoO3 after the activation process. However, apart from contradicting these results, in operando Raman spectroscopy revealed some of the intermediate steps of the activation process. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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26. CuInS2-based photocatalysts for photocatalytic hydrogen evolution via water splitting.
- Author
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Yang, Yuqi, Zheng, Xinlong, Song, Yiming, Liu, Yuhao, Wu, Daoxiong, Li, Jing, Liu, Weifeng, Fu, Lirong, Shen, Yijun, and Tian, Xinlong
- Subjects
- *
PHOTOCATALYSTS , *SEMICONDUCTOR materials , *MELTING points , *COPPER sulfide , *HYDROGEN , *SOLAR cells - Abstract
The realization of efficient photocatalytic hydrogen evolution (PHE) significantly depends on the development of durable and effective semiconductor photocatalysts. Copper indium sulfide (CuInS 2) is an emerging ternary chalcogenide semiconductor material for solar-to-chemical energy application, because it possesses a suitable bandgap, environment-friendly elements, and a low melting point. CuInS 2 -based semiconductor photocatalysts have been investigated for PHE via water splitting, but current PHE performance still has difficulty in meeting commercial application requirements and needs to be further improved. In this review, the basic semiconductor properties of CuInS 2 , including its crystal and band structures, are introduced, and its PHE mechanism is discussed in detail. The PHE performance of CuInS 2 -based photocatalysts is systematically discussed, with a focus on morphology, engineered structure, and heterojunction construction. Finally, issues and challenges currently encountered in the PHE application of CuInS 2 -based photocatalysts and their possible solutions are presented. [Display omitted] • The article focuses on photocatalytic hydrogen evolution (PHE) using CuInS 2 as photocatalyst. • Semiconductor properties of CuInS 2 is suitable for efficient PHE. • The strategies that enhance PHE rate of CuInS 2 are summarized. • Limitations and future prospects of CuInS 2 -based photocatalysts have also been reviewed. [ABSTRACT FROM AUTHOR] more...
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- 2023
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27. Employing facile molten-salt strategy towards erbium ornamentation over CuInS2 for upgrading visible-light-driven hydrogen production and Cr(VI) reduction.
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Wang, Fulin, Yang, Yanming, Li, Xiangwei, Huang, Weiya, Lu, Kangqiang, Ouyang, Shaobo, Xiang, Wentao, Zhou, Chensheng, Yu, Changlin, Zhou, Man, and Yang, Kai
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RARE earth metals ,RARE earth ions ,HYDROGEN production ,HYDROGEN as fuel ,METAL sulfides ,SILVER - Abstract
Rare earth ions can serve as the focal point of electron capture states, thereby enhancing the effectiveness of separating photogenerated carriers, which is an effective strategy for boosting the photocatalytic efficiency of metal sulfides. Despite this, the efficient doping all at once remains a challenge. In this research, we successfully synthesized highly dispersed Er-doped CuInS 2 nanosheet-connected nanoblocks (Er-CIS) using the facile molten salt method. Erbium ornamentation over CuInS 2 exhibits the enhanced photocatalytic activities and the faster reaction rate for the hydrogen generation and the reduction of Cr(VI) under visible light irradiation. Specifically, the optimal 5 %Er-CIS displays a 2.0-fold and 4.89-fold increase in the ability to produce hydrogen and reduce Cr(VI), respectively, in comparison to that of pristine CuInS 2. The upgrading results of photocatalytic activities can be attributed to multiple effects of Er ornamentation over CuInS 2 : 1) the substitution of Er atoms for CuInS 2 nanosheet-connected nanoblocks structure broadens the absorption range of visible light and further promotes the efficiency of separating the carriers; 2) the excellent hydrophilicity behavior for Er doping is propitious to lower the energy barrier for H 2 O dissociation and promote the generation and the transformation of protons; 3) furthermore, DFT calculations and photoelectrochemical measurements demonstrate that the presence of high dispersed Er effectively enhances the liberation of electrons and augments the active surface area. This finding presents a facile method for activating metal sulfides by incorporating rare earth elements to improve photocatalytic efficiency. This discovery highlights the activated photocatalytic behavior of metal sulfides through facile molten salt approach with the use of rare earth. • Er
3+ doped CuInS 2 (Er-CIS) photocatalyst was synthesized via molten salt method. • The introduction of Er3+ enhanced light absorption and the separation and transfer efficiency of photogenerated carriers. • Hydrogen production and Cr reduction capacity of 5 %Er-CIS was 2.0 and 4.89 times higher than that of CuInS 2 , respectively. • DFT calculations indicated that Er3+ doping reduced the electron escape work and the free energy of hydrogen production. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
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28. Origin of Enhanced Photoelectrochemical Activity of the n-CdS/p-type Semiconductor Interface: Homojunction or Heterojunction?
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Chae SY, Jun M, Yoon N, Joo OS, Kim JY, and Park ED
- Abstract
Surface engineering of photoelectrodes is considered critical for achieving efficient photoelectrochemical (PEC) cells, and various p-type materials have been investigated for use as photoelectrodes. Among these, the p-type semiconductor/n-type CdS heterojunction is the most successful photocathode structure because of its enhanced onset potential and photocurrent. However, it is determined that the main contributor to the enhanced activity is the Cd-doped layer and not the CdS layer. In this study, a Cd-doped n
+ p-buried homojunction of a CuInS2 photocathode is first demonstrated without a CdS layer. The homojunction exhibited a more active and stable PEC performance than the CdS/CuInS2 heterojunction. Moreover, it is confirmed that Cd doping is effective for other p-type materials. These results strongly suggest that the effects of Cd doping on photocathodes should be carefully investigated when designing CdS/p-semiconductor heterojunction photoelectrodes. They also indicate that the Cd-doped layer has great potential to replace the CdS layer in future photoelectrode designs., (© 2024 Wiley‐VCH GmbH.) more...- Published
- 2025
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29. Anti-Site Defect-Induced Cascaded Sub-Band Transition in CuInS 2 Enables Infrared Light-Driven CO 2 Reduction.
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Liao C, He Z, Wang F, Liu Y, and Guo L
- Abstract
Photocatalytic CO
2 conversion is a promising approach to simultaneously mitigate climate change and alleviate the energy crisis. However, infrared light, which constitutes nearly half of the solar energy, has not been effectively utilized yet. In this work, we discover a photogenerated charge transition mechanism in CuInS2 with intrinsic InCu antisite defects for synergistic utilization of full-spectrum photons. Femtosecond transient absorption spectroscopy and DFT calculation unveil an intermediate band induced by the intrinsic antisite defects, where cascaded sub-band transition could be realized by high-energy photons (UV-vis) and low-energy (IR), thus improving the absorption range of infrared light as well as the utilization efficiency of photogenerated carriers. In situ Kelvin probe force microscopy demonstrates that the generation of photoexcited electrons could be greatly enhanced through this synergistic utilization of full spectrum light. Moreover, in situ X-ray photoelectron spectroscopy and in situ diffuse reflectance infrared Fourier transform spectroscopy reveal that infrared photons could also enhance the adsorption and activation of CO2 and H2 O on the catalyst surface. As a result, the CO production rate under full spectrum light reaches 19.9 μmol g-1 h-1 , which is more than a 7-fold increase over that under UV-vis irradiation. more...- Published
- 2024
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30. Multimodal Temperature Readout Boosts the Performance of CuInS 2 /ZnS Quantum Dot Nanothermometers.
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Duda M, Joshi P, Borodziuk A, Sobczak K, Sikora-Dobrowolska B, Maćkowski S, Dennis AM, and Kłopotowski Ł
- Abstract
Fluorescent nanothermometers are positioned to revolutionize research into cell functions and provide strategies for early diagnostics. Fluorescent nanostructures hold particular promise to fulfill this potential if nontoxic, stable varieties allowing for precise temperature measurement with high thermal sensitivities can be fabricated. In this work, we investigate the performance of micelle-encapsulated CuInS
2 /ZnS core/shell colloidal quantum dots (QDs) as fluorescent nanothermometers. We demonstrate four temperature readout modes, which are based on variations in the photoluminescence intensity, energy, and lifetime and on a specific ratio of excitation efficiencies. We further leverage this multimodal readout to construct a fifth, multiparametric thermometer calibration based on the multiple linear regression (MLR) model. We show that the MLR approach boosts the thermometer sensitivity by up to 7-fold while reducing the readout error by about a factor of 3. As a result, our QDs offer the highest sensitivities among semiconducting QDs emitting in the first biological window. The obtained results indicate that CuInS2 /ZnS QDs are excellent candidates for intracellular in vivo thermometry and provide guidelines for further optimization of their performance. more...- Published
- 2024
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31. Controllable growth of coral-like CuInS2 on one-dimensional SiO2 nanotube with super-hydrophilicity for enhanced photocatalytic hydrogen evolution.
- Author
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Yu, Haiyan, Liang, Haiou, Bai, Jie, and Li, Chunping
- Subjects
- *
NANOTUBES , *INTERSTITIAL hydrogen generation , *ELECTRON-hole recombination , *HYDROGEN , *SEMICONDUCTOR design , *PHOTOCATALYSTS - Abstract
Designing a semiconductor photocatalyst with a unique structure is crucial for photocatalytic hydrogen evolution. The adsorption of water molecules is considered to be an important link affecting the photocatalytic activity. Nanoconfined water molecules inside the microporous SiO 2 nanotube adsorbed on the active sites boosting the photocatalytic hydrogen evolution compared with the bulk water system. Herein, hydrophilic porous SiO 2 hollow nanotubes were prepared through electrospinning fiber membranes as templates. CuInS 2 nanoparticles were uniformly deposited on porous SiO 2 hollow nanotubes to form CuInS 2 /SiO 2 composites. The unique CuInS 2 /SiO 2 hollow nanotube with a coral structure was prepared. A series of characterization results show that CuInS 2 supported on porous SiO 2 hollow nanotubes has two advantages. On the one hand, SiO 2 has excellent hydrophilicity and can be used as a micro water-collecting reactor to reduce mass transfer resistance. On the other hand, SiO 2 reduces the particle size of CuInS 2 , thus improving the utilization rate of light, and inhibiting electron-hole recombination. The CuInS 2 /SiO 2 with a coral structure exhibited the highest hydrogen production rate of 367.00 μmol g−1 h−1 under visible light irradiation (λ ≥ 420 nm), which is 3.1 times than that of CuInS 2 powder. This work points out a novel method to enhance photocatalytic hydrogen evolution. • Hydrophilic SiO 2 hollow tubes as a micro collector reactor effectively promoted the photocatalytic reaction. • Hydrophilic CuInS 2 /SiO 2 catalyst with coral-like morphology was designed. • The SiO 2 hollow tube with large specific surface area reduces the particle size of CuInS 2. [ABSTRACT FROM AUTHOR] more...
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- 2022
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32. A low-toxicity molecular precursor for nanocrystalline CuInS2 solar cells.
- Author
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Dong, Chao, Liu, Rong, and Meng, Weili
- Subjects
- *
BAND gaps , *SOLAR cells , *SOLAR energy , *THIN films , *PHOTOVOLTAIC power generation , *PHOTOVOLTAIC power systems - Abstract
• Nanocrystalline CuInS 2 films were prepared by a low-toxicity molecular precursor. • CuInS 2 films annealed at different temperature exhibit band gaps of ∼ 1.5 eV. • Annealing temperature imposes a significant influence on device performance. • The champion device based on CuInS 2 annealed at 350 °C yields an efficiency of 1.94 % Compact and smooth nanocrystalline CuInS 2 thin films were prepared by a low-toxicity molecular precursor solution method at low-temperature and exhibit band gaps of about 1.5 eV, which is promising for photovoltaics. We fabricated a planar heterojunction solar cell configured as FTO/CdS/CuInS 2 /Spiro-OMeTAD/Au. The champion device based on CuInS 2 film annealed at 350 °C yields an average power conversion efficiency of 1.79 % (maximum 1.94 %) and exhibits a good stability. [ABSTRACT FROM AUTHOR] more...
- Published
- 2025
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33. Sonochemical synthesis and characterization of CuInS2 nanostructures using new sulfur precursor and their application as photocatalyst for degradation of organic pollutants under simulated sunlight
- Author
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Aazam Jafarinejad, Hadis Bashiri, and Masoud Salavati-Niasari
- Subjects
Nanostructures ,Photodegradation ,CuInS2 ,Erythrosine ,Rubeanic acid ,Sonochemical fabrication ,Chemistry ,QD1-999 - Abstract
In this research, we investigated the photocatalytic activity of CuInS2 nanoparticles in visible light during the decomposition of three toxic dyes (Eriochrome Black T, Rhodamine B, and Erythrosine). The CuInS2 nanostructures were synthesized by a rapid and simple sonochemical method using dithiooxamide as a sulfur reagent and various capping agents, including SDS, CTAB, and PVP, were applied to achieve a pure structure with fine morphology. The flower-like structure was observed through FESEM images, implying different capping agents and fabrication had a considerable influence on the morphology of samples. The suitable bandgap of CuInS2 (1.53 eV) was obtained from DRS analysis and resulted in higher photodegradation efficiency. The fabricated CuInS2 revealed better photodegradation efficiency (74.8%) to the anionic dyes than cationic dye. A possible photodegradation mechanism was suggested based on scavenger tests of active species. more...
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- 2022
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34. Surface and interfacial engineering for aqueous-processed quantum dots-sensitized solar cell with efficiency approaching 11 %.
- Author
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Zeng, Heng-Huei, Rasal, Akash S., Alemayehu Abate, Mulu, Vithal Ghule, Anil, and Chang, Jia-Yaw
- Subjects
- *
SOLAR cell efficiency , *ELECTRON configuration , *OPEN-circuit voltage , *SURFACE defects , *ENERGY bands , *DYE-sensitized solar cells , *QUANTUM dots - Abstract
[Display omitted] • Demonstrated a highly efficient, environmentally-friendly QDs synthesis method. • Introducing novel surface and interfacial engineering strategies. • Achieving a record-breaking efficiency for aqueous-processed QDSSCs. This study presents a straightforward method for the aqueous synthesis of CuInSe 2 (CISe) quantum dots (QDs) utilizing various surface linkers. The energy band position and average photoluminescent lifetime of QDs are both influenced by different surface linkers. As a result, L-cysteine-capped CISe (C-CISe) quantum-dot sensitized solar cell (QDSSC) achieves an exceptional efficiency of 9.06 %, signifying a substantial improvement of approximately 39.0 % in comparison to QDSSC sensitized with thioglycolic acid-capped CISe QDs. After refining the device efficiency by modulating surface linkers of pre-synthesized QDs, surface and interface modification, which involved CuInS 2 (CIS) QDs and Gd3+ ions, respectively, were proposed to further improve the photovoltaic efficiency of pristine C-CISe cell. Implementing the cascade co-sensitization architecture of C-CISe and CIS QDs in the device resulted in an improved efficiency of 9.99 %, compared to devices that used an inverted cascaded CIS/C-CISe structure, which obtained an efficiency of 7.20 %. Furthermore, the Gd3+ ions, possessing a stable half-filled electron configuration, are the first report employed for heterointerface modification between C-CISe and CIS QD in QDSSC. The resulting C-CISe/Gd/CIS cell achieved a J SC of 31.4 mA/cm2, V OC of 0.63 V, and FF of 55.2 %, resulting in the highest efficiency of 10.91 %. Electrochemical impedance spectroscopy, open-circuit voltage decay, and intensity-modulated photocurrent/voltage spectroscopy collectively indicate that the introduction of interface modification (Gd3+ ions) and surface co-sensitization (CIS QDs) can effectively reduce the quantity of charge recombination pathways at the interface between the electrolyte and photoanode. [ABSTRACT FROM AUTHOR] more...
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- 2024
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35. Promoting charge separation in CuInS2/CeO2 photocatalysts by an S-scheme heterojunction for enhanced photocatalytic H2 production.
- Author
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Wang, Jing, Niu, Xingyu, Hao, Qi, Zhang, Kun, Shi, Xinyi, Yang, Liping, Yang, Hui Ying, Ye, Jilei, and Wu, Yuping
- Subjects
- *
HETEROJUNCTIONS , *CERIUM oxides , *INTERSTITIAL hydrogen generation , *PHOTOCATALYSTS , *ELECTRON paramagnetic resonance , *CHARGE transfer , *IRRADIATION , *DENSITY functional theory - Abstract
• An S-scheme heterojunction of CIS/CeO 2 was synthesized by combining CeO 2 with CIS. • The S-scheme heterojunction is beneficial to improve charge separation in CIS/CeO 2. • CIS/CeO 2 shows improved photocatalytic performance compared with both CIS and CeO 2. • The charge separation mechanism is verified by experiments and DFT calculations. Low charge separation efficiency significantly hampers the performance of photocatalytic hydrogen production. Constructing heterojunctions emerges as a crucial strategy to enhance photocatalytic activity by improving charge separation. An S-scheme heterojunction not only effectively separates the photogenerated charge in composite photocatalysts but also preserves optimal redox capabilities. This study presents the first report of CuInS 2 /CeO 2 (CIS/CeO 2) and demonstrates how charge separation within CIS/CeO 2 to enhance photocatalytic hydrogen production through the construction of an S-scheme heterojunction. The UV–visible-driven hydrogen production rate of CIS/CeO 2 is 4.6 and 9.4 times higher than that of CIS and CeO 2 alone, respectively. The improved photocatalytic performance primarily stems from enhanced charge separation promoted by the S-scheme heterojunction. The charge transfer pathway was confirmed as an S-scheme mechanism through a combination of band structure experiments, density functional theory (DFT) calculations on work function, internal electric field, and charge differential density distribution, alongside electron paramagnetic resonance (EPR) experiments. Multiple perspectives were employed to elucidate the reasons behind facilitating efficient charge separation. This research provides valuable insights for advancing photocatalytic performance. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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36. Systematic Study on Preparation of CuInS2 Films with Chalcopyrite from Nitrates.
- Author
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Li, Jing, Du, Jie, Liu, Kegao, and Yu, Liuyang
- Subjects
- *
CHALCOPYRITE , *BAND gaps , *NITRATES , *THIOACETAMIDE , *THIOUREA - Abstract
The Chalcopyrite CuInS2 films were prepared from nitrates below 220 °C. When the anhydrous ethanol is used as the solvent, the reaction cycle, temperature and holding time are main factors affecting crystallization. Increasing the reaction cycle, temperature and holding time are beneficial to the crystallinity. CuInS2 films prepared with thioacetamide and thiourea as sulfur sources have the chalcopyrite structure, the crystallinity of CuInS2 film prepared by thiourea is slightly better than that of by thioacetamide. It consists of spherical particles with diameters of 0.1 ∼ 0.4 μm. The band estimated gap of chalcopyrite CuInS2 film samples is about 1.49 ∼ 1.51 eV. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
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37. Semiconductor nanosheets for electrocatalytic self-coupling of benzaldehyde to hydrobenzoin
- Author
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China Scholarship Council, Lanzhou University, National Natural Science Foundation of China, Natural Science Foundation of Sichuan Province, China Postdoctoral Science Foundation, European Commission, Generalitat de Catalunya, Consejo Superior de Investigaciones Científicas (España), Gong, Li, Zhang, Chao Yue, Mu, Xiao, Han, Xu, Li, Junshan, Arbiol, Jordi, Zhou, Jin Yuan, Kallio, Tanja, Martínez-Alanis, Paulina R., Cabot, Andreu, China Scholarship Council, Lanzhou University, National Natural Science Foundation of China, Natural Science Foundation of Sichuan Province, China Postdoctoral Science Foundation, European Commission, Generalitat de Catalunya, Consejo Superior de Investigaciones Científicas (España), Gong, Li, Zhang, Chao Yue, Mu, Xiao, Han, Xu, Li, Junshan, Arbiol, Jordi, Zhou, Jin Yuan, Kallio, Tanja, Martínez-Alanis, Paulina R., and Cabot, Andreu more...
- Abstract
The electrochemical reduction of biomass-derived feedstocks provides a sustainable platform for the synthesis of a wide range of chemical commodities and biofuels. Despite their interest, the optimization of reaction conditions, the screening of electrode materials, and the mechanistic understanding of these processes lag well behind other chemical routes. Here, we focus on the electrochemical self-coupling of benzaldehyde (BZH) to hydrobenzoin (HDB) using semiconductor electrocatalysts with nanosheet morphologies. By testing several semiconductor materials, a correlation is observed between their band gap and the electrochemical potential necessary to maximize selectivity towards HDB in alkaline medium, which we associate with the charge accumulation at the semiconductor surface. N-type CuInS2 provides the highest conversion rate at 0.3 mmol cm−2h−1 with a selectivity of 98.5 % at −1.3 V vs. Hg/HgO. Additional density functional theory calculations demonstrate a lower kinetic energy barrier at the CuInS2 surface compared with graphitic carbon, proving its catalytic role in the self-coupling reaction of BZH. more...
- Published
- 2024
38. Synergistic Cr(VI) Reduction and Chloramphenicol Degradation by the Visible-Light-Induced Photocatalysis of CuInS2: Performance and Reaction Mechanism
- Author
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Chaosheng Zhu, Jingyu Li, Yukun Chai, Yongcai Zhang, Yunlin Li, Xiangli Zhang, Jin Liu, and Yan Li
- Subjects
CuInS2 ,Cr(VI) reduction ,chloramphenicol degradation ,synergistic effect ,visible light photocatalysis ,Chemistry ,QD1-999 - Abstract
Despite significant scientific efforts in the field of water treatment, pollution of drinking water by toxic metal ions and synthetic organic compounds is becoming an increasing problem. The photocatalytic capabilities of CuInS2 nanoparticles were examined in this study for both the degradation of chloramphenicol (CAP) and the reduction of Cr(VI). CuInS2 nanoparticles were produced using a straightforward solvothermal approach and subsequently characterized by many analysis techniques. Simultaneous photocatalytic Cr(VI) reduction and CAP oxidation by the CuInS2 nanoparticles under visible-light demonstrated that lower pH and sufficient dissolved oxygen favored both Cr(VI) reduction and CAP oxidation. On the basis of active species quenching experiments, the possible photocatalytic mechanisms for Cr(VI) conversion with synchronous CAP degradation were proposed. Additionally, the CuInS2 retains a high rate of mixed pollutant removal after five runs. This work shows that organic contaminants and heavy metal ions can be treated concurrently by the visible-light-induced photocatalysis of CuInS2. more...
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- 2022
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39. THEORETICAL INVESTIGATION ON THE ELASTIC AND THERMODYNAMIC PROPERTIES OF CuInS2.
- Author
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Shenghai FAN and Ziai LU
- Subjects
- *
ELASTICITY , *BULK modulus , *ELASTIC constants , *DENSITY functionals , *CHALCOPYRITE crystals , *DENSITY functional theory - Abstract
The first-principles method based on the density functional theory is used to investigate the properties of chalcopyrite CuInS2 crystal. The crystal structural parameters are optimized, and the elastic constants and bulk modulus are also calculated, and the results are highly consistent with those in the literature. The stability of the crystal is judged from the Born stability criteria. Based on the quasi-harmonic Debye model, the pressure and temperature dependencies of the bulk modulus, the Debye temperature, the Grüneisen parameter, and the thermal expansion coefficient are obtained. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
40. THEORETICAL INVESTIGATION ON THE ELASTIC AND THERMODYNAMIC PROPERTIES OF CuInS2.
- Author
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Shenghai FAN and Ziai LU
- Subjects
ELASTICITY ,BULK modulus ,ELASTIC constants ,DENSITY functionals ,CHALCOPYRITE crystals ,DENSITY functional theory - Abstract
The first-principles method based on the density functional theory is used to investigate the properties of chalcopyrite CuInS
2 crystal. The crystal structural parameters are optimized, and the elastic constants and bulk modulus are also calculated, and the results are highly consistent with those in the literature. The stability of the crystal is judged from the Born stability criteria. Based on the quasi-harmonic Debye model, the pressure and temperature dependencies of the bulk modulus, the Debye temperature, the Grüneisen parameter, and the thermal expansion coefficient are obtained. [ABSTRACT FROM AUTHOR] more...- Published
- 2022
- Full Text
- View/download PDF
41. Laser ablative TiO2 and tremella-like CuInS2 nanocomposites for robust and ultrasensitive photoelectrochemical sensing of let-7a.
- Author
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Fu, Cuiping, Wang, Xuefeng, Xue, Fumin, Zhu, Peihua, Zhou, Weijia, Ge, Shenguang, and Yu, Jinghua
- Subjects
- *
AMPLIFICATION reactions , *LASER engraving , *ELECTRON donors , *NANOCOMPOSITE materials , *LASERS , *DETECTION limit - Abstract
A photoelectrochemical (PEC) biosensor based on a multiple signal amplification strategy was established for highly sensitive detection of microRNA (miRNA). TiO2 was prepared on the surface of titanium sheet by laser etching to improve its stability and photoelectrical properties, and CuInS2-sensitized TiO2 was used to form a superior photoelectrical layer, which realized the initial signal amplification. The electron donor dopamine (DA) was modified to H2 as a signal regulator, which effectively increased the photocurrent signal. To further amplify the signal, an enzyme-free hybridization reaction was implemented. When target let-7a and fuel-DNA (F-DNA) were present, the base of H1 specifically recognized let-7a and forced dopamine@AuNPs-H2 away from the electrode surface. Subsequently, the end base of H1 specifically recognized F-DNA, and let-7a was replaced and recycled to participate in the next cycle. Enzyme-free circulation, as a multifunctional amplification method, ensured the recycling of target molecules. This PEC sensor for let-7a detection showed an excellent linear response from 0.5 to 1000 pM with a detection limit of 0.12 pM. The intra-batch RSD was 3.8% and the recovery was 87.74–108.1%. The sensor was further used for clinical biomolecular monitoring of miRNA, showing excellent quantitative detection capability. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
42. Postdeposition Sulfurization of CuInSe2 Solar Absorbers by Employing Sacrificial CuInS2 Precursor Layers.
- Author
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Khavari, Faraz, Saini, Nishant, Keller, Jan, Larsen, Jes K., Sopiha, Kostiantyn V., Martin, Natalia M., Törndahl, Tobias, Björkman, Charlotte Platzer, and Edoff, Marika
- Subjects
- *
SOLAR cell efficiency , *QUANTUM measurement , *QUANTUM efficiency , *SELENIUM , *X-ray diffraction , *AIR heaters , *SULFUR , *METALLIC thin films - Abstract
Herein, a new route of sulfur grading in CuInSe2 (CISe) thin‐film solar absorbers by introducing an ultrathin (<50 nm) sacrificial sputtered CuInS2 (CIS) layer on top of the CISe. Different CIS top layer compositions (Cu‐poor to Cu‐rich) are analyzed, before and after a high‐temperature treatment in selenium (Se)‐ or selenium+sulfur (SeS)‐rich atmospheres. An [S]/([S] + [Se]) grading from the surface into the bulk of the Se‐ and SeS‐treated samples is observed, and evidence of the formation of a mixed CuIn(S,Se)2 phase by Raman analysis and X‐ray diffraction is provided. The optical bandgap from quantum efficiency measurements of solar cells is increased from 1.00 eV for the CISe reference to 1.14 and 1.30 eV for the Se‐ and SeS‐treated bilayer samples, respectively. A ≈150 mV higher VOC is observed for the SeS‐treated bilayer sample, but the cell exhibits blocking characteristics resulting in lower efficiency as compared with the CISe reference. This blocking is attributed to an internal electron barrier at the interface to the sulfur‐rich surface layer. The difference in reaction routes and possible ways to improve the developed sulfurization process are discussed. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
43. Facile fabrication of CdSe/CuInS2 microflowers with efficient photocatalytic hydrogen production activity.
- Author
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Wang, Ying, Peng, Jiaru, Xu, Yangfan, Zhao, Ruiyang, Han, Jishu, and Wang, Lei
- Subjects
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HYDROGEN production , *QUANTUM dots , *CHARGE exchange , *LIGHT absorption - Abstract
Photocatalytic water splitting to produce hydrogen has attracted extensive attention and exhibited broad development prospects. In this work, CuInS 2 microflowers were fabricated through the solvothermal method, and decorated with CdSe quantum dots on the surface. As-prepared CdSe/CuInS 2 microflowers exhibited high photocatalytic hydrogen production activity (10610.37 μmol g−1 h−1) and high AQE of 48.97% at 420 nm. The enhanced photocatalytic hydrogen production activity owing to the construction of p-n heterostructure improved light absorption ability, increased electrons transfer efficiency and reduced recombination of photo-induced electrons and holes. Moreover, high stability and cyclic utilization of CdSe/CuInS 2 microflowers were beneficial to photocatalytic hydrogen production application. [Display omitted] • CuInS 2 microflowers were synthesized and modified with CdSe QDs on the surface. • CdSe/CuInS 2 exhibited high photocatalytic H 2 production activity and high AQE. • The construction of p-n heterostructure efficiently enhanced photocatalytic performance. [ABSTRACT FROM AUTHOR] more...
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- 2022
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44. A green synthesis of CuInS2/MIL-101(Cr) nanocomposite with efficient visible light induced photocatalytic activity
- Author
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Hong Van T Nguyen, Manh B Nguyen, Huan V Doan, and Xuan Nui Pham
- Subjects
CuInS2 ,MIL-101(Cr) ,recycled TPA ,plastic recycling ,tetracycline degradation ,Materials of engineering and construction. Mechanics of materials ,TA401-492 ,Chemical technology ,TP1-1185 - Abstract
This study demonstrates the sustainable synthesis of multifunctional CIS@MIL-101(Cr) composites for water treatment applications. The composites were prepared via hybridization of CuInS _2 with MIL-101(Cr) resulting in the formation of CIS nanoplates incorporated into MIL-101(Cr). The composites exhibited enhanced visible light photocatalytic activity due to their low bandgap energy and were tested for tetracycline photodegradation achieving a degradation efficiency of 98.8%. The material showed high stability after four cycles, and the effects of reactive species on photodegradation were investigated. The kinetics and mechanism of the photocatalytic process were studied, and LC-MS analysis was conducted to identify intermediate products. These results demonstrate the potential of using waste PET to create new semiconductors for water pollution control, promoting a circular material pathway. more...
- Published
- 2023
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45. Photo-electrochemical CO2 reduction at CuInS2 thin-film cathodes modified with CuIn alloy particles derived from Cu2O particles.
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An, Chenguang, Liu, Feng, and Yuan, Jiongliang
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- *
CATHODES , *THIN films , *CATALYTIC activity , *ALLOYS , *ELECTROPLATING - Abstract
In order to reduce CO2 to ethanol, the CuIn alloy-particle modified CuInS2 (CuIn AP/CIS) composite thin-film electrodes have been suggested and their catalytic activity and selectivity have been examined. The CuIn AP/CIS composite thin films have been fabricated via by two-step electrodeposition route – electrodepositing the Cu2O particles on the CuInS2 thin films, followed by electrodeposition of metallic indium on the Cu2O/CuInS2 thin films. Compared to the Cu2O/CuInS2 composite thin-film electrode, the CuIn AP/CIS composite thin-film electrode exhibits high catalytic activity and selectivity for ethanol formation. At the CuIn AP/CIS composite thin-film electrode with electrodeposition of In for 30 s, ethanol concentration reaches 0.046 mM at 1.5 h. The results of the electrochemical impedance spectra show that the interface charge-transfer is the rate-determining step in the CO2 reduction process, and the CuIn AP/CIS composite thin-film electrode with electrodeposition of In for 30 s exhibits the smallest resistant of the interface charge-transfer. The study on the adsorbed intermediates shows that the surface modification of CuIn AP increases *CO coverage and decreases *H coverage significantly, thus promoting coupling of *CO. Therefore, the selectivity for ethanol formation is improved. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
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46. CdS@CuInS2 nanocomposites for enhanced photocatalytic activity under visible light irradiation.
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Rahman, Ashmalina, Khan, Fazlurrahman, Jennings, James Robert, Kim, Young-Mog, and Khan, Mohammad Mansoob
- Subjects
- *
VISIBLE spectra , *PHOTODEGRADATION , *RADICAL ions , *HYDROXYL group , *COPPER sulfide , *DYES & dyeing , *INDIUM oxide , *PHOTOCATALYSTS - Abstract
Copper indium sulfide (CuInS 2) and CuInS 2 modified with different percentages of CdS (10% CdS@CuInS 2 , 20% CdS@CuInS 2 , and 30% CdS@CuInS 2) were successfully synthesized, as confirmed by structural, optical, and morphological characterization. The photocatalytic performance of the CuInS 2 and CdS@CuInS 2 composites was evaluated by degrading brilliant green (BG) dye and converting 4-nitrophenol under visible light irradiation. Amongst the synthesized photocatalysts, 30% CdS@CuInS 2 exhibited the highest photocatalytic activity, degrading 96.8% of BG within 5 h. The active species involved in the degradation processes were investigated by performing degradation experiments in the presence of suitable trapping agents for superoxide radical ions (O 2 •−), hydroxyl radicals (•OH), and valence band holes (h+). It was found that O 2 •− is the main active species in the photocatalytic degradation of BG by CdS@CuInS 2. Moreover, the photocatalytic conversion of 4-nitrophenol was also enhanced up to 95.5% under visible light irradiation, and h+ is the main active species involved in the conversion. This work opens new avenues for the development of highly efficient photocatalysts for practical wastewater remediation. The effect of CdS on structural, optical, and morphological properties of the CuInS 2 synthesized using a microwave method for photocatalytic degradation of brilliant green and conversion of 4-nitrophenol. [Display omitted] • CuInS 2 and CdS@CuInS 2 synthesized using microwave-assisted method. • Effect of CdS on the structural, optical, and morphological properties of CuInS 2. • Photocatalytic degradation brilliant green using CuInS 2 and CdS@CuInS 2. • Photocatalytic conversion of 4-nitrophenol using CuInS 2 and CdS@CuInS 2. • Determination of active species involved in the photocatalytic processes. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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47. Aqueous synthesis of photoluminescence enhanced CuInS2/ZnS quantum dots via the facile hot injection growth of AgInS2 interlayer.
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Piao, Zhiyan, Yang, Dan, Fu, Zizhao, He, Haiyang, Cui, Zhongjie, Lu, Hanxu, Chen, Yuanyuan, Mei, Shiliang, Zhang, Wanlu, and Guo, Ruiqian
- Subjects
- *
QUANTUM dots , *PHOTOLUMINESCENCE - Abstract
In this study, the hot injection of Ag ions to enhance the PL performance of aqueous-phase CuInS 2 /ZnS quantum dots (QDs) via the formation of AgInS 2 interlayer is first developed. Different amount of Ag doping by hot injection realizes the precise tuning of the peak wavelength from 649 nm to 684 nm, while the photoluminescence quantum yield is also improved from 14.79% to 26.8% due to the formation of the AgInS 2 interlayer on the surface of CuInS 2 QDs. The results of various characterizations demonstrate the formation of AgInS 2 interlayer and explain the enhanced PL performance of CuInS 2 QDs. This will expand the understanding of the PL enhancement of the aqueous-phase CuInS 2 /ZnS QDs and solidify the foundation for subsequent practical research to further realize the potential of aqueous CuInS 2 QDs. An AgInS 2 interlayer was formed on the surface of CuInS 2 core, enhancing the PL intensity. A precise tuning of PL spectrum from 649 nm to 684 nm by adjusting Ag doping amount was realized. The PL QY of the CuInS 2 /ZnS was boosted from 14.79% to 26.8% via Ag doping. The effects of Ag hot injection doping on the surface/lattice structure are discussed in detail. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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48. A signal-on photoelectrochemical aptasensor based on ferrocene labeled triple helix DNA molecular switch for detection of antibiotic amoxicillin.
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Wang, Mengyan, Li, Ying, Zhang, Chi, Li, Gaiping, and Zou, Lina
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- *
MOLECULAR switches , *AMOXICILLIN , *DNA , *PHOTOCURRENTS , *HAIRPIN (Genetics) , *CYANOBACTERIAL toxins , *FERROCENE - Abstract
• P-type CuInS 2 microflower recombined rGO modified ITO was used as photocathode. • Target was recognized by triple helix DNA switch in homogeneous solution. • Ferrocene labeled single stranded DNA was released as signal probe. • Energy level matching between ferrocene and CuInS 2 leaded an enhanced photocurrent. A sensitive signal-on photoelectrochemical aptasensor for antibiotic determination was constructed based on the energy level matching between ferrocene and CuInS 2. P-type CuInS 2 microflower was complexed with reduced graphene oxide (CuInS 2 /rGO) to get photocathode current with good photoelectric conversion efficiency and stability. Then, hairpin DNA (HP) was covalently bonded to the electrode surface. A triple helix DNA (THMS) was used as a molecular switch. After the specific recognition between target and THMS in homogeneous solution, ferrocene labeled probe (Fc-T2) was released. Finally, Fc-T2 was captured by the HP, which leaded the obvious increase of photocurrent for the energy level matching between ferrocene and CuInS 2. The increase of the photocurrent signal was proportional to the concentration of target amoxicillin (AMOX), the linear range was 100 fM-100 nM with detection limit of 19.57 fM. Meanwhile, the method has been successfully applied for milk and lake water samples analysis with satisfactory results. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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49. ANNEALING TEMPERATURE AND COCATALYST EFFECTS TO THE PHOTOELECTROCHEMICAL PROPERTY OF CuInS2 THIN FILM SEMICONDUCTOR.
- Author
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Gunawan, Haris, A., Widiyandari, H., Widodo, D. S., Septina, W., and Ikeda, S.
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- *
SEMICONDUCTOR thin films , *TEMPERATURE effect , *PHOTOCATHODES , *PLATINUM electrodes , *THIN films - Abstract
Thin film of CuInS2 semiconductor had been synthesized by copper and indium stack electrodepositions on a molybdenum glass substrate and followed by sulfurization at varied annealing temperatures of 600-800 °C. CuInS2 thin film was characterized by using XRD, Raman, and SEM. Then on the CuInS2 was deposited Pt with various deposition times and its photocurrent property was observed. Finally, Pt or Rh cocatalyst deposited on In2S3-CuInS2 was also measured its photoelectrochemical property. XRD, Raman, and SEM data showed CuInS2 had a different character with varied annealing temperatures. An annealing temperature of 680 °C gave a maximum photocurrent of CuInS2 as a photocathode. The introduction of cocatalysts increased the photocurrent, even for Rh cocatalyst gave a better-applied bias photon-to-current efficiency than Pt. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
- Full Text
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50. Study on Performance of U (VI) in CuInS2 Photocatalytic Reduction Solution.
- Author
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HE Deng-wu, LI Guan-chao, LI Xiao-yan, WANG Yang, FU Xiao-hui, and WANG Yu-ying
- Published
- 2021
- Full Text
- View/download PDF
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