2,073 results on '"ZnS"'
Search Results
102. II–VI Semiconductor-Based Optical Temperature Sensors
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Saxena, Nupur, Kumar, Pragati, and Korotcenkov, Ghenadii, editor
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- 2023
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103. Introduction in Gas Sensing
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Korotcenkov, Ghenadii, Brinzari, Vladimir, and Korotcenkov, Ghenadii, editor
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- 2023
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104. II-VI Semiconductor-Based Thin Film Electric and Electronic Gas Sensors
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Vallejos, Stella, Blackman, Chris, and Korotcenkov, Ghenadii, editor
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- 2023
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105. Medical Applications of II-VI Semiconductor-Based Radiation Detectors
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Korotcenkov, Ghenadii, Vatavu, Sergiu, and Korotcenkov, Ghenadii, editor
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- 2023
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106. Thiozincate Phase Na2Zn4S5 in Spurrite Marbles at Tulul Al Hamam, Daba-Siwaga Pyrometamorphic Complex, Jordan: Chemical and Raman Data
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Sharygin, V. V., Sokol, E. V., Nigmatulina, E. N., Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, and Marin, Yuri, editor
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- 2023
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107. DFT Study of CuS-ZnS Heterostructures
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Oppong-Antwi, Louis, Hart, Judy N., Alam, Shafiq, editor, Guillen, Donna Post, editor, Tesfaye, Fiseha, editor, Zhang, Lei, editor, Hockaday, Susanna A.C., editor, Neelameggham, Neale R., editor, Peng, Hong, editor, Haque, Nawshad, editor, and Liu, Yan, editor more...
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- 2023
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108. ZnS-Based UV Detectors
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Ebrahimi, Sema, Yarmand, Benyamin, Naderi, Nima, and Korotcenkov, Ghenadii, editor
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- 2023
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109. Nanowire-Based Photodetectors for Visible-UV Spectral Region
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Korotcenkov, Ghenadii, Sysoev, Victor V., and Korotcenkov, Ghenadii, editor
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- 2023
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110. Flexible Photodetectors Based on II-VI Semiconductors
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Peng, Mingfa, Sun, Xuhui, and Korotcenkov, Ghenadii, editor
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- 2023
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111. Solution-Processed Photodetectors
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Mostaque, Shaikh Khaled, Kuddus, Abdul, Rahman, Md. Ferdous, Korotcenkov, Ghenadii, Hossain, Jaker, and Korotcenkov, Ghenadii, editor
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- 2023
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112. QDs of Wide Band Gap II–VI Semiconductors Luminescent Properties and Photodetector Applications
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Abdullah, M., Al-Nashy, Baqer O., Korotcenkov, Ghenadii, Al-Khursan, Amin H., and Korotcenkov, Ghenadii, editor
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- 2023
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113. Photodetectors Based on II-VI Multicomponent Alloys
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Korotcenkov, Ghenadii, Semikina, Tetyana, and Korotcenkov, Ghenadii, editor
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- 2023
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114. Improving the Electrochemical Performance of Zinc Sulfides by Iron Doping Toward Supercapacitor Applications
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Saad Gomaa Mohamed, Mona Mahmoud Morad, Masoom Raza Siddiqui, Abdullah Al Mahmud, and Wail Al Zoubi
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Asymmetric supercapacitors ,Energy storage ,Fe‐doping ,ZnS ,Physics ,QC1-999 ,Technology - Abstract
Abstract The rational design of heterostructured Fe‐doped ZnS microspheres (FeZnS‐MS) and their use as electrode materials for supercapacitors (SCs) is proposed. FeZnS‐MS are mounted on a Ni foam substrate to develop high‐activity positive electrodes for SCs. The morphological and electrochemical performances of the hydrothermally synthesized FeZnS‐MS are investigated, revealing the formation of microspherical Fe‐doped ZnS nanocubes. Different Fe ratios (0.1, 0.2, and 0.3) are successfully introduced to ZnS without impurities, whereas two phases are produced when the percentage is increased to 0.4. Notably, under a current density of 2 A g−1, the Zn0.7Fe0.3S nanocomposite showed an exceptional specific capacitance of 575 F g−1, compared to the moderate value (200 F g−1) achieved by ZnS. At 0.5 and 1 A g−1, the Zn0.7Fe0.3S electrode presented an even better specific capacitance of 700 and 604.5 F g−1, respectively. Using this electrode, a hybrid supercapacitor system is developed and delivered 11 Wh kg−1 and a high specific power of 591.2 W kg−1. more...
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- 2024
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115. Tailoring the gas sensing characteristics of ZnO and ZnS monolayers toward CO2, CO and N2 upon introducing defects and substitutional functionalization
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Pornsawan Sikam, Sireetone Yawirach, Anucha Watcharapasorn, Thanayut Kaewmaraya, and Pairot Moontragoon
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CO2 ,CO and N2 adsorption ,ZnO ,ZnS ,Monolayer ,DOS ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
This work aims to design two-dimensional (2D) catalysts based ZnO and ZnS for CO2 reduction reaction (CRR), nitrogen reduction reaction (NRR), CO2 and N2 captures and sensors. Cheap and abundant elements which are Mg, Cl, and N are doped into Zn, S, and O sites to tune the electronic properties of the ZnO and ZnS monolayers. Also, influences of O, S and Zn vacancies on the electronic properties and gas adsorption are examined as well. Adsorption energy, interaction energy, distortion energy, density of states, Bader charge, shift of Fermi level, and work function of the modified surfaces are studied via density functional theory (DFT) performed on VASP. From the results, Mg, Cl, and N doping as well as vacant sites can extremely change electronic properties, i.e., semiconductive to metallic behavior, the shift of Fermi level and the variation of work function. Some modified ZnS and ZnO monolayers can be good candidates CRR and NRR catalysts since neither too strong nor too light binding of CO2, CO and N2. The best catalysts for this study is (Mg, VZn)-ZnO and Cl-ZnS because both can be sensors and electrochemical catalysts due to the proper binding strength for CO2, CO and N2 adsorption. The change in the electronic properties leading to the change in gas adsorption shows that the ZnO and ZnS modification by cheap-element doping and vacancy-site creation are potential ways to improve their properties, extend their applications and lead to the invention promising catalysts for electrochemical reactions, gas sensors and gas storages. more...
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- 2023
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116. Effect of cooling rate on the crystallization and optical properties of silicate glasses containing ZnS.
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Liu, Jingjing, Wei, Jiahui, and Liu, Chao
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GLASS-ceramics , *SEMICONDUCTOR nanocrystals , *OPTICAL properties , *OPTICAL glass , *CRYSTALLIZATION , *GLASS construction - Abstract
Cooling rate has large effect on the structures and properties of glasses, which may change the chemical, physical, and mechanical properties of glasses, and their crystallization behaviors. In this work, effect of cooling rate on the crystallization and optical properties of glasses, which have been utilized to precipitate semiconductor nanocrystals, are investigated using sodium zinc silicate glasses as typical example. Cooling rate strongly affects the structural connectivity of the glasses, and as a result, Na 8 Al 4 Si 4 O 18 nanocrystals are formed as predominant crystalline phases in glasses with larger cooling rate, and ZnS nanocrystals are formed in glasses with smaller cooling rate. Results reported illustrate that it is important to control the cooling rate of the glass in order to modulate the crystallization and optical properties of semiconductor nanocrystals embedded in glasses. [ABSTRACT FROM AUTHOR] more...
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- 2023
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117. Effect of ZnS nanoparticles in photoluminescence properties of Tb3+ ion doped silica glass for photonic applications.
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Ralte, Lalruatpuia, Dawngliana, K. M. S., Fanai, A. L., and Rai, S.
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ZINC sulfide , *FUSED silica , *PHOTOLUMINESCENCE , *BAND gaps , *NANOPARTICLES , *TRANSMISSION electron microscopy , *X-ray diffraction - Abstract
The ZnS nanoparticles doped with Tb3+ ions and ZnS doped silica glass-ceramic were synthesized by sol–gel method. The density, refractive index and various physical properties were calculated. X-ray diffraction (XRD) and selected area electron diffraction (SAED) studies confirm the formation of hexagonal polycrystalline structure. Transmission electron microscopy (TEM) analyses revealed that variation in size of the particles lies between 10 to 50 nm. FTIR were used to examine the structural characteristics of prepared glass samples at specific annealing temperatures. The band gap energy of the as-synthesized nanocomposite glass was 3.18 eV with a green light emission. The influence of ZnS nanoparticles on Tb3+ ions doped glass was studies by photoluminescence (PL) spectra. The PL emission intensity increased with the concentrations of ZnS. The CIE chromaticity revealed that the tunability of color changes from blue-green to yellowish green region as ZnS concentration increases. [ABSTRACT FROM AUTHOR] more...
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- 2023
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118. Reflective color filters deposited via ZnS single-target sputtering for colorful solar cell applications.
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Cho, Dae-Hyung, Lee, Woo-Jung, Hwang, Tae-Ha, and Chung, Yong-Duck
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SOLAR cells , *LIGHT filters , *OPTICAL control , *OPTICAL films , *OPTICAL properties , *REFRACTIVE index , *PHOTOVOLTAIC power systems - Abstract
The use of colorful solar cells is necessary for building-integrated photovoltaic (BIPV) applications in urban areas, where aesthetics play an important role. The conventional deposition process of multilayer color filters utilized in solar cells for BIPV applications is expensive because it requires multiple sputter targets. Herein, to address the issue of high cost, a single sputter target was used to produce a color filter consisting of a Zn-based multilayer structure. The oxygen content in the Zn(O,S) films could be controlled by adjusting the amount of oxygen gas supplied during the sputtering process. This allows for control of the optical properties of the films, including the refractive index and extinction coefficient. A color filter with the Zn(O 0.92 ,S 0.08)/ZnS structure repeated three times was applied to Cu(In,Ga)Se 2 thin-film solar cells; the resulting solar cell demonstrated a wide range of color expressions and less than 10% reduction in optical performance. The proposed technology is expected to significantly reduce the cost of optical filter processes and their applications. [ABSTRACT FROM AUTHOR] more...
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- 2023
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119. Examining the Effect of Cu and Mn Dopants on the Structure of Zinc Blende ZnS Nanopowders.
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Kuzmin, Alexei, Pudza, Inga, Dile, Milena, Laganovska, Katrina, and Zolotarjovs, Aleksejs
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ZINC sulfide , *EXTENDED X-ray absorption fine structure , *COPPER , *SPHALERITE , *MONTE Carlo method , *X-ray absorption - Abstract
It is known that doping zinc sulfide (ZnS) nanoparticles with Mn or Cu ions significantly affects their luminescent properties. Herein, we investigated how dopant atoms are incorporated into the structure of ZnS using X-ray diffraction and multi-edge X-ray absorption spectroscopy. The observed broadening of the X-ray diffraction patterns indicates an average crystallite size of about 6 nm. By analyzing the Zn, Mn, and Cu K-edge extended X-ray absorption fine structure (EXAFS) spectra using the reverse Monte Carlo method, we were able to determine the relaxations of the local environments around the dopants. Our findings suggested that upon the substitution of Zn by Mn or Cu ions, there is a shortening of the Cu–S bonds by 0.08 Å, whereas the Mn–S bonds exhibited lengthening by 0.07 Å. These experimental results were further confirmed by first-principles density functional theory calculations, which explained the increase in the Mn–S bond lengths due to the high-spin state of Mn 2 + ions. [ABSTRACT FROM AUTHOR] more...
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- 2023
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120. Synthesis and Characterization of ZnS Nanoparticles by Chemical Co-precipitation Method.
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Sreenivasulu, Boggala, Obulapathi, Lavuluri, Hari Prasad Reddy, Mylapalli, and Venkatramana Reddy, Sakirevupalli
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ZINC sulfide , *BAND gaps , *COPRECIPITATION (Chemistry) , *ENERGY bands , *SEMICONDUCTORS , *SPHALERITE - Abstract
ZnS nanomaterials were effectively synthesized by the chemical co-precipitation method by using Zinc Acetate (Zn (CH3COO)2·2H2O), sodium sulfide (Na2S) and Poly Vinyl Pyrollidine (PVP) as precursor materials. The reactions were carried out at ambient temperature. The X-ray diffraction (XRD) studies confirmed the cubic zinc blende shape of ZnS. Surface morphology of the prepared material was analyzed by scanning electron microscopic (SEM) and transmission electron microscopic (TEM) techniques. The average particle size of the ZnS is found to be around 2 to 3 nm. Optical studies were carried out to calculate band gap energy by using UV-visible spectroscopy. The band gap energy of prepared ZnS nanoparticles is found to be as 3.7 eV. [ABSTRACT FROM AUTHOR] more...
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- 2023
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121. ZnS and ZnS/ZnO assembly for photocatalytic removal of Reactive Red 66.
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Sheshmani, Shabnam, Mardali, Mahan, Shahvelayati, Ashraf S., and Hajiaghababaei, Leila
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PHOTOCATALYSIS ,PHOTODEGRADATION ,ULTRAVIOLET radiation ,ELECTRON holography ,ZINC oxide - Abstract
The current work investigated the effect of ZnS and ZnS/ZnO assembly on the photocatalytic removal of Reactive Red 66 from an aqueous solution. The photocatalytic activities were carried out using both UV irradiation and visible light, and the effects of various operating parameters, such as pH, catalyst loading, dye concentration, and contact time, were studied. The results showed that the ZnS/ZnO heterostructure exhibited a higher dye removal percentage than ZnS alone and assisted in the photodegradation of Reactive Red 66. Maximum adsorption was found at pH 2 and 5, indicating that the dye removal was strongly pH-dependent. The highest dye removal efficiency under UV light was 77.7 and 91.7% using ZnS and ZnS/ZnO, respectively. Furthermore, the degradation percentage of Reactive Red 66 by ZnS and ZnS/ZnO decreased to 43.3 and 75.2% under visible light. The enhanced photocatalytic activity of the ZnS/ZnO heterostructure is attributed to its high absorption of light, efficient separation of electron-hole pairs, and quick surface reaction in the heterostructure. [ABSTRACT FROM AUTHOR] more...
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- 2023
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122. Toward High‐Efficiency CIGS‐based Thin‐film Solar Cells Incorporating Surface Defects Layer, through a Comparative Study of Electrical Characteristics—SCAPS 1D Modeling.
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Houmomou, Anne Marie, Mohammadou, Sali, Dzifack Kenfack, Guy Maurel, Tchangnwa Nya, Fridolin, Laref, Amel, and Mohamadou, Alidou
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SURFACE defects ,SOLAR cells ,PHOTOVOLTAIC power systems ,ELECTRON affinity ,ZINC sulfide ,BUFFER layers - Abstract
This research contribution investigates a way of improving performance of CIGSe‐based second‐generation thin‐film solar cells by analyzing output parameters of two reference cells using cadmium sulfide and zinc sulfide as buffer layers. The performances are improved by acknowledging both the exceptional properties of ZnS as a buffer layer, and the beneficial contributions of an indium‐enrich layer, which form a surface defect layer at the ZnS/CIGSe heterojunction. SCAPS‐1D numerical modeling software is used to conduct calculations, and the structure using ZnS enables achieving an efficiency of 24.31%. Deeper investigation on the effects of variation of functional layers properties such as bandgap, electron affinity, doping level, and thickness enables retaining an optimized structure, and results show an improved efficiency of 25.22% and a fill factor of 80.26%, indicating of a fluid flow of charge carriers, thus a more stable device. All simulations are performed considering experimental environment parameters, an external temperature of 300 K, light illumination of AM1.5G, and defects states are assumed in both the bulk and at interfaces. [ABSTRACT FROM AUTHOR] more...
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- 2023
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123. Structural, thermal and cytotoxic evaluation of ZnS-sensitized ZnO nanorods developed by single cyclic SILAR process.
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Khan, Faizan, Zaidi, Syed Jazib Abbas, Tariq, Salman, Khan, Talha Farooq, Rehman, Nagina, and Basit, Muhammad Abdul
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ZINC sulfide ,NANORODS ,ZINC oxide ,NANOSTRUCTURED materials ,THIN films ,PHOTOELECTRONS - Abstract
On one hand, morphological modification of ZnO nanoparticles (NPs) has served as an effectual route for the realization of improved photochemical and/or photobiological performances while on the other hand, there have been meaningful attempts to combine pristine ZnO NPs with secondary nanoscale materials for the same. In this paper, we are reporting the development of a binary system of ZnO and ZnS in which ZnO is used in nanorod (NR) like one-dimensional form whereas ZnS is deposited over it in 0-dimensional quantum-dots (QDs) form. Not only this combination is unique in its originality, the low scale sensitization of ZnS over ZnO-NR is also effectual to improve the bioactivity of resultant ZnO-NR/ZnS nanomaterial. Alongside the thermal characterization by TGA/DSC which is important to trace the potential of transformation of ZnO-NR/ZnS to corresponding thin films for optoelectronic applications, we carried out shrimp cells' assay and evaluated the chemical and toxic impact on microorganisms. To prove the successful low scale deposition of ZnS on ZnO-NR, we analyzed the X-ray photoelectron spectroscopic studies too. Based on the thermal, morphological and biological evaluation, it is believed that the resultant ZnO-NR/ZnS is purely compatible for various optical and electronic applications including but not limited to photocatalysis, etc. [ABSTRACT FROM AUTHOR] more...
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- 2023
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124. Enhancing Flash Storage Performance and Lifetime with Host-Guided Data Placement
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Purandare, Devashish Ravindra
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Computer science ,Flash ,Host Device Coordination ,SSDs ,Storage ,ZNS - Abstract
Solid State Drives (SSDs) form the core of modern data center storage, propelled by rapid growth in capacity and improved performance and reliability over hard drives. However, with shrinking feature sizes, capacity gains come at the cost of performance degradation and reduced lifetime. NAND flash’s inability to support in-place updates further degrades performance and lifetime due to the overhead of remapping and garbage collection. Even in SSD-optimized log-structured systems, the lack of coordination can result in misaligned and interleaved logs across the storage stack, requiring garbage collection at multiple levels, increasing wear due to write amplification. Efforts to address these issues require rethinking the SSD interface, leveraging host insights to co-locate related data. Such co-location can improve write isolation across unrelated data streams and reduce write amplification by lowering data movement caused by garbage collection.However, host-device coordination interfaces have struggled with large-scale adoption. The complexity introduced by integrating interface changes in applications and filesystems, coupled with the difficulty of grouping related data, makes adoption expensive and non-portable. Further, useful placement directives are hard to generate as applications are storage-unaware and filesystems application- unaware. Abstraction breaking changes can increase security risks and limit generalizability. Unless we tackle the complexity of abstraction changes and placement planning head-on, embracing these new interfaces will be limited to proof- of-concept applications or proprietary hyperscalar silos.In this dissertation, we identify and address the pressing issues that limit host- device coordination: (i) Enabling host-device coordination without large-scale application or filesystem rewrites, (ii) Generating intelligent placement directives based on the application and workload, and (iii) Simplified data placement and storage management for current and future SSD interfaces. We present systems that can coordinate or work independently to support modern interfaces: (i) Shimmer allows applications to support requirements of changing interfaces without modifying the application or the storage system. (ii) Parakeet presents a rich API that can capture data relations and lifetimes and generate heuristic-based or dynamic data placement plans. (iii) Persimmon and shimmer-vfs can manage the placement and maintenance of flash storage and utilize the placement indicators from Parakeet. Our approach enables embracing host-device coordination without requiring changes to data management systems.Together, these systems eliminate in-place updates and present a highly optimized data path for flash without kernel bypass or application-specific approaches. We demonstrate a 30-90% improvement in write throughput, a reduction in read and write latency, with a factor of 14 reduction in tail latency, and a large reduction in garbage collection overhead over traditional approaches. Further, we demonstrate that shim layers can keep up with highly-tuned per-application approaches, reducing application and filesystem complexity, reducing CPU, memory, and space utilization, and enabling more applications to unlock the full performance of SSDs. more...
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- 2024
125. Influence of Fe3+ ions on the crystallographic, optical and electrochemical performance of ZnS quantum dots
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Sakthivel, P., Krishnamoorthy, A., and Devadoss, I.
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- 2024
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126. Numerical prediction on the photovoltaic performance of CZTS‐based thin film solar cell
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Ahnaf Tahmid Abir, Arifuzzaman Joy, Bipanko Kumar Mondal, and Jaker Hossain
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CZTS ,dual‐heterojunction ,high efficiency ,WSe2 ,ZnS ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Abstract This article presents an enormously effective Cu2ZnSnS4 (CZTS)‐based n‐ZnS/p‐CZTS/p+‐WSe2 thin film solar cell. The device has been studied by varying the thickness, doping concentration and defect density of each layer utilizing SCAPS‐1D simulation software. The power conversion efficiency (PCE) for n‐ZnS/p‐CZTS single heterojunction is 14.06% with the JSC = 20.26 mA cm−2, VOC = 0.88 V and FF = 78.59%, respectively. This PCE is elevated to 27.31% with the JSC = 33.72 mA cm−2, VOC = 0.97 V and FF = 83.75%, respectively due to insertion of WSe2 back surface field (BSF) layer in the same structure. The significant improvement of PCE mainly depends on short circuit current which is resulted due to WSe2 layer that absorbs sub‐band gap photons through tail‐states‐assisted (TSA) photon upconversion method. These entire results demonstrate the potential of WSe2 as BSF layer in CZTS‐based thin film solar cells. more...
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- 2023
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127. Photocatalytic degradation of 2,4,6-trinitrotoluene (TNT) in the presence of ZnS, NiS and ZnS/NiS supported Clinoptilolite under UV irradiation: experimental and neural network modelling.
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Norouzi, Mahdi, Karimian, Azam, Dehghani, Hosseine, and Rezvan Leylan, Seyyed Alireza
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IRRADIATION , *PHOTODEGRADATION , *TRICHLOROPHENOL , *CLINOPTILOLITE , *NICKEL sulfide , *X-ray diffraction , *ION exchange (Chemistry) - Abstract
The Photocatalytic degradation of 2,4,6-trinitrotoluene (TNT), catalysed by nanosized ZnS, NiS and ZnS/NiS photocatalysts, was studied under UV irradiation. ZnS, NiS and ZnS/NiS nanoparticles were incorporated onto Iranian natural Clinoptilolite (CP) zeolite by calcination of Zn+2and Ni+2 ion-exchanged Clinoptilolite. The photocatalysts were characterised by the TEM, FT-IR, XRD, DRS, UV-VIS, HPLC and COD methods. The average particle size of different photocatalysts incorporated onto CP was calculated through XRD analyzes between 70–40 µm. The degradation extent of TNT was investigated by UV–Vis spectrophotometry, COD and HPLC. The influence of pH, concentration of TNT in aqueous solution, contact time, amount of photocatalysts and concentration of ion exchange solution on the degradation efficiency has also been studied. After 160 minutes of photocatalytic degradation experiments, the highest degradation (88.5%) was recorded at a concentration of 55 mg.L−1 of TNT and the lowest degradation (37.9%) at pH = 7. It has been revealed that0.075 g ZnS7.1%/NiS2.7%nanoCP (NCP)photocatalyst at pH = 11, with 55 mg.L−1 TNT solution was the optimum parameters of the experiment. A feed-forward Artificial neural network (ANN) was employed to predict the photocatalytic degradation of 2,4,6-trinitrotoluene (TNT)based on a set of experimental tests. The results indicated that the ANN model prediction and experimental data have excellent accordance and the model can be used for prediction of photocatalytic degradation efficiency. The sensitivity analysis revealed that the concentration of TNT has a considerable effect on degradation efficiency (about 26.19%). [ABSTRACT FROM AUTHOR] more...
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- 2023
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128. Wide-ranging Force Responsive Composites based on 1,2-Dioxetane and ZnS as Luminescent Probes in Polyurethanes.
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Zhang, Jin-Hui, Liu, Shuang, Yuan, Yuan, and Chen, Yu-Lan
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LUMINESCENT probes , *POLYURETHANES , *ZINC sulfide , *LUMINESCENCE , *POLYMERS - Abstract
Combining the advantages of mechanochemiluminescence from 1,2-dioxetane and elastico-mechanoluminescence from ZnS particles, a new kind of mechanoluminescent polymer composites are developed. They can emit bright luminescence with two distinct colors at different strains, empowering a verstaile mechanochemical strategy for force sensing and damage detection at a wider force responsive range. [ABSTRACT FROM AUTHOR] more...
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- 2023
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129. ZnS on Cu2Te quantum dots: preparation, characterisation, and optimisation of photocatalytic/H2O2 process by response surface methodology.
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Fatolahi, Leila
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RESPONSE surfaces (Statistics) , *QUANTUM dots , *ZINC sulfide , *SCANNING electron microscopy , *LIGHT scattering , *X-ray diffraction - Abstract
Fluoroquinolone antibiotic is used extensively and, is obtained to reasoninfluences neurologically on living microorganisms. In the present study, the photocatalyst/H2O2underUV light photo-degradation of Enrofloxacin was studied. In addition to that, ZnS on Cu2Tequantum dots was gathered via a simple synthesis method. The ZnS/Cu2Tenanocomposites were characterizedby dynamic light scattering, X-ray diffraction, scanning electron microscopy, and UV-vis spectroscopytothe evaluation of theoptical, and morphological properties.The Box-Behnken design method was used for Experiments optimizationusing response surface methodology (RSM). Several factors like ZnS/Cu2Teconcentration, H2O2concentration, and initial pH on the optimisation ofEnrofloxacinphoto-degradation were evaluatedwiththe polynomial regression method. At optimum process factors (ZnS/Cu2Te: 50 mg/L, H2O2: 100 mg/L, and pH: 6), the Enrofloxacinphoto-degradation was achieved 84.58% during 40 min as process time.The photo-degradationanalyzed for severaldecompositionprocesseslike as, H2O2, UV/H2O2, UV+ZnS/Cu2Te, and UV+ZnS/Cu2Te+H2O2 were carried out at the optimum factors. In this study,the Statistical evaluation was carried out for the optimisation of photo-degradation processes for the removalof pharmaceutical wastewater. [ABSTRACT FROM AUTHOR] more...
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- 2023
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130. Air‐condition process for scalable fabrication of CdS/ZnS 1D/2D heterojunctions toward efficient and stable photocatalytic hydrogen production.
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Zhang, Dongdong, Teng, Jie, Yang, Hongli, Fang, Zhi, Song, Kai, Wang, Lin, Hou, Huilin, Lu, Xianlu, Bowen, Chris R., and Yang, Weiyou
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We report the scalable fabrication of CdS/ZnS 1D/2D heterojunctions under ambient air conditions (i.e., room temperature and atmospheric pressure) in which ZnS nanoparticles are anchored on the surface of CdS nanosheets. The as‐formed heterojunctions exhibit a significantly enhanced photocatalytic H2 evolution rate of 14.02 mmol h−1 g−1 when irradiated with visible light, which is ~10 and 85 times higher than those of pristine CdS nanosheets and CdS nanoparticles, respectively, and superior to most of the CdS‐based photocatalysts reported to date. Furthermore, they provide robust photocatalytic performance with demonstratable stability over 58 h, indicating their potential for practical applications. The formation of 1D/2D heterojunctions not only provides improved exposed active sites that respond to illumination but also provides a rapid pathway to generate photogenerated carriers for efficient separation and transfer through the matrix of single‐crystalline CdS nanosheets. In addition, first‐principles simulations demonstrate that the existence of rich Zn vacancies increases the energy level of the ZnS valence band maximum to construct type‐II and Z‐scheme mixed heterojunctions, which plays a critical role in suppressing the recombination of carriers with limited photocorrosion of CdS to enhance photocatalytic behavior. [ABSTRACT FROM AUTHOR] more...
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- 2023
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131. Photocatalytic H 2 Production by Visible Light on Cd 0.5 Zn 0.5 S Photocatalysts Modified with Ni(OH) 2 by Impregnation Method.
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Páll, Bence, Mersel, Maali-Amel, Pekker, Péter, Makó, Éva, Vágvölgyi, Veronika, Németh, Miklós, Pap, József Sándor, Fodor, Lajos, and Horváth, Ottó
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VISIBLE spectra , *ALKALINE solutions , *PHOTOCATALYSTS , *HYDROGEN as fuel , *QUANTUM efficiency , *CLEAN energy , *HYDROGEN production , *STEAM reforming - Abstract
Nowadays, the study of environmentally friendly ways of producing hydrogen as a green energy source is an increasingly important challenge. One of these potential processes is the heterogeneous photocatalytic splitting of water or other hydrogen sources such as H2S or its alkaline solution. The most common catalysts used for H2 production from Na2S solution are the CdS-ZnS type catalysts, whose efficiency can be further enhanced by Ni-modification. In this work, the surface of Cd0.5Zn0.5S composite was modified with Ni(II) compound for photocatalytic H2 generation. Besides two conventional methods, impregnation was also applied, which is a simple but unconventional modification technique for the CdS-type catalysts. Among the catalysts modified with 1% Ni(II), the impregnation method resulted in the highest activity, for which a quantum efficiency of 15.8% was achieved by using a 415 nm LED and Na2S-Na2SO3 sacrificial solution. This corresponded to an outstanding rate of 170 mmol H2/h/g under the given experimental conditions. The catalysts were characterized by DRS, XRD, TEM, STEM-EDS, and XPS analyses, which confirmed that Ni(II) is mainly present as Ni(OH)2 on the surface of the CdS-ZnS composite. The observations from the illumination experiments indicated that Ni(OH)2 was oxidized during the reaction, and that it therefore played a hole-trapping role. [ABSTRACT FROM AUTHOR] more...
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- 2023
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132. High power aqueous hybrid asymmetric supercapacitor based on zero-dimensional ZnS nanoparticles with two-dimensional nanoflakes CuSe2 nanostructures.
- Author
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Ahmad, Syed Awais, Shah, Muhammad Zia Ullah, Arif, Muhammad, Ullah, Ehsan, ur Rahman, Shams, Shah, Muhammad Sana Ullah, Eldin, Syed M., Song, Peng, Sajjad, Muhammad, and Shah, A.
- Subjects
- *
HYBRID power , *SONOCHEMICAL degradation , *ENERGY storage , *SUPERCAPACITOR electrodes , *ZINC sulfide , *ELECTRIC conductivity , *NANOSTRUCTURES - Abstract
Energy storage materials, particularly chalcogenides, are fascinating electrode materials for supercapacitors (SCs) because of their high capacitance, remarkable electrical conductivity, and multiple oxidation states contributed by numerous metal cations. Herein, a novel nanocomposite based on zinc sulfide and copper diselenide, denoted as (ZnS–CuSe 2), was prepared via a sonochemical-assisted method. The structural analysis revealed the cubic structure for pure ZnS, orthorhombic for CuSe 2, and co-existing cubic and orthorhombic phases for ZnS–CuSe 2 nanocomposites with high purity and crystallinity. The ZnS–CuSe 2 nanocomposite offered exceptional electrochemical performance with redox peaks from the CV analysis, and coupled with plateaus in the charge/discharge profile, confirming the faradaic energy storage properties with functional reversibility. Similarly, a high conductive feature of the ZnS–CuSe 2 composite was revealed by impedance study, with a minor charge transfer resistance than their bulk materials. A hybrid asymmetric supercapacitor (HASCs) composed of ZnS–CuSe 2 //AC was constructed, which manifested an enlarged voltage window up to 1.7 V with capacitance of 95 F g−1 and a maximum specific energy of 38 Wh kg−1. Also, high power delivery was attained at 3927 Wkg-1 when specific energy goes down to 12 Wh kg− at 5 A g−1. Interestingly, only 81.8% retention was left beneath when cycled to 8000 cycles, specifying decent stability of the ZnS–CuSe 2 //AC HASCs. [ABSTRACT FROM AUTHOR] more...
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- 2023
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133. High-efficient removal of Cu(II) using biochar/ZnS composite: optimized by response surface methodology.
- Author
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Yan, Lili, Jiang, Siyu, Rao, Pinhua, Li, Guanghui, Hao, Zongdi, He, Lei, Liu, Shanliang, and Shang, Guofeng
- Subjects
- *
RESPONSE surfaces (Statistics) , *COPPER , *BIOCHAR , *LEAD removal (Water purification) , *RICE hulls , *ADSORPTION kinetics - Abstract
Rice hull biochar modified by ZnS nanocrystals (RBZ) was developed as an efficient absorbent for the removal of Cu(II) in aqueous solution. Response surface methodology (RSM) was applied for modeling and optimizing the performance of RBZ. The maximum adsorption capacity of RBZ toward Cu(II) through the Langmuir model fitting was 248.98 mg g−1, which was four times larger than that of rice hull biochar (RB). The adsorption kinetics of Cu(II) and XPS analysis revealed that the chemisorption process played the leading role when using RBZ. Through competition ions study, Pb(II), Cd(II), or Ca(II) can slightly reduce the adsorption of Cu(II). According to the Box Behnken design method, the analysis of variance results showed that the pH and adsorbent dosage had significant effects on the predicted responses of adsorption capacity and removal efficiency. When using the optimum conditions, pH 6, temperature 27 °C, and dosage 0.20 mg mL−1 for removing Cu(II) in solution, the maximum adsorption capacity and relatively higher removal efficiency could be obtained through the 3D response surface plots. The results demonstrated that RSM is feasible to achieve optimal conditions for adsorption capacity and removal efficiency simultaneously toward heavy metals from aqueous medium, and the interaction between them when using the biochar/ZnS composite. [ABSTRACT FROM AUTHOR] more...
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- 2023
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134. Preliminary results on the characterization of ZnS and ZnS:La nanophosphors synthetized by chemical route.
- Author
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Rodríguez-Lazcano, Y, Barrios-Salgado, E, Correcher, V, Pérez-Orozco, J P, Altuzar, P, and Campos, J
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- *
SEMICONDUCTOR materials , *SCANNING electron microscopy , *THERMOLUMINESCENCE , *X-ray diffraction - Abstract
ZnS, a semiconductor material with a bandgap in the range of 3.6–3.8 eV, can be employed as a scintillator. We herein report on the preliminary results obtained from the thermoluminescence (TL) emission of ZnS and ZnS:La nanophosphors synthesized by chemical route. The samples were characterized by X-ray diffraction, scanning electron microscopy and TL. ZnS samples show a TL maximum centred at 87°C, while the ZnS:La sample shows two groups of components appearing between 70–160°C and 190–330°C. The dose–response displays a good linearity in the range of 10–17 Gy. [ABSTRACT FROM AUTHOR] more...
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- 2023
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135. Recent Strategies and Developments of ZnS Nanomaterials as Photocatalysts and Electrocatalysts
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Bhushan, Medha, Jha, Ranjana, Bhardwaj, Rekha, and Ikhmayies, Shadia Jamil, Series Editor
- Published
- 2022
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136. Remediation of perchloroethylene contaminated groundwater using Fe0/ZnS embedded in a highly porous polymer: Experimental results on pilot-scale photoreactor and kinetic modeling analysis for industrial scale-up
- Author
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Wanda Navarra, Olga Sacco, Raffaella Rescigno, Christophe Daniel, Vincenzo Vaiano, Domenico Pisano, Bruno Brancato, Francesco Casertano, Mario Raiola, and Vincenzo Venditto
- Subjects
Zero-valent iron (ZVI) ,ZnS ,Syndiotactic polystyrene (sPS) aerogel ,Perchloroethylene ,Kinetics model ,Pilot-scale photoreactor ,Chemistry ,QD1-999 - Abstract
Perchloroethylene (PCE) is a pollutant toxic to aquatic life and suspected of being a human carcinogen. It is also recalcitrant to degradation. Therefore remediation of PCE-contaminated groundwater is currently still a challenging task. In this work, the efficiency of a UV-assisted oxidation process exploiting a photocatalyst composed of zero-valent iron supported on commercial zinc sulfide (Fe/ZnS) and incorporated in a highly porous polymer, is investigated. The experimental studies were carried out, for about six months, on a pilot-scale photoreactor operating in continuous mode at the Solofra (Campania, Italy) wastewater plant, to evaluate the effectiveness and stability of the photocatalytic system. The results show that it is possible to reach a PCE degradation in natural groundwater in the range of 85–95%%. Furthermore, a kinetic model is developed and compared with collected experimental data. The mathematical model well describes the experimental data of the photocatalytic system operating both in batch and continuous mode and therefore it can be potentially used for further scale-up of photocatalytic systems devoted to PCE degradation, allowing to estimate the catalyst weight required for total PCE removal as a function of the liquid flow rate to be treated and inlet PCE concentration. more...
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- 2023
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137. Air‐condition process for scalable fabrication of CdS/ZnS 1D/2D heterojunctions toward efficient and stable photocatalytic hydrogen production
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Dongdong Zhang, Jie Teng, Hongli Yang, Zhi Fang, Kai Song, Lin Wang, Huilin Hou, Xianlu Lu, Chris R. Bowen, and Weiyou Yang
- Subjects
air condition ,CdS ,heterojunctions ,photocatalytic hydrogen production ,ZnS ,Production of electric energy or power. Powerplants. Central stations ,TK1001-1841 - Abstract
Abstract We report the scalable fabrication of CdS/ZnS 1D/2D heterojunctions under ambient air conditions (i.e., room temperature and atmospheric pressure) in which ZnS nanoparticles are anchored on the surface of CdS nanosheets. The as‐formed heterojunctions exhibit a significantly enhanced photocatalytic H2 evolution rate of 14.02 mmol h−1 g−1 when irradiated with visible light, which is ~10 and 85 times higher than those of pristine CdS nanosheets and CdS nanoparticles, respectively, and superior to most of the CdS‐based photocatalysts reported to date. Furthermore, they provide robust photocatalytic performance with demonstratable stability over 58 h, indicating their potential for practical applications. The formation of 1D/2D heterojunctions not only provides improved exposed active sites that respond to illumination but also provides a rapid pathway to generate photogenerated carriers for efficient separation and transfer through the matrix of single‐crystalline CdS nanosheets. In addition, first‐principles simulations demonstrate that the existence of rich Zn vacancies increases the energy level of the ZnS valence band maximum to construct type‐II and Z‐scheme mixed heterojunctions, which plays a critical role in suppressing the recombination of carriers with limited photocorrosion of CdS to enhance photocatalytic behavior. more...
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- 2023
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138. Highly efficient and selective Hg(II) adsorbent: ZnS grown on the surface of 4A zeolite and supported on starch aerogels.
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Jiang, Chuanzhi, Yang, Chengyue, Fu, Yong, Chen, Feng, and Hu, Jianshe
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ZINC sulfide ,ZEOLITES ,EMISSIONS (Air pollution) ,AEROGELS ,STARCH ,ADSORPTION capacity ,MERCURY (Element) - Abstract
In this study, ZnS nanoparticles were loaded on the surface of zeolite NaA and embedded in a carbon aerogel to prepare C@zeolite-ZnS, where zeolite NaA was used in order to adsorb Zn
2+</superscript> ions released during ion exchange, and the carbon aerogel had good dispersion as a carrier for ZnS to solve the ZnS agglomeration problem. The morphology and structure of C@zeolite-ZnS were characterized by FT-IR, XRD, SEM, BET, and XPS. C@zeolite-ZnS showed excellent selectivity and high removal rate for Hg(II) ions with a maximum adsorption capacity of 795.83 mg/g. When the pH, adsorption time, and Hg(II) ion concentration were 6, 30 min, and 25 mg/L at 298 K, the corresponding adsorption and removal rates reached 99.90% and 124.88 mg/g, respectively. Thermodynamic studies have shown that the adsorption process is a spontaneous heat absorption process. Furthermore, after up to 10 cycles of adsorption, the adsorbent still exhibited outstanding stability and high adsorption capacity with removal rates exceeding 99%. In conclusion, C@zeolite-ZnS, which is stable and reusable and has the ability to meet industrial emission standards after adsorption of Hg(II) ions, is very promising for industrial applications. [ABSTRACT FROM AUTHOR] more... - Published
- 2023
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139. Photoluminescence of wurtzite-type Ce-doped ZnS nanocrystals processed by a low-temperature aqueous solution approach.
- Author
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González, Luis A., Sánchez-Cardona, Vianey, Escorcia-García, José, and Meléndez-Lira, Miguel A.
- Subjects
- *
NANOCRYSTALS , *ENERGY dispersive X-ray spectroscopy , *AQUEOUS solutions , *X-ray photoelectron spectroscopy , *PHOTOLUMINESCENCE - Abstract
Undoped and Ce-doped ZnS nanocrystals with hexagonal wurtzite structure were synthesized by a low-temperature aqueous solution method that uses l -cysteine as complexing and capping agent. The morphology analysis revealed the formation of polydisperse nanocrystals with sizes in the range of 2–4 nm, while the energy dispersive X-ray spectroscopy showed that all the samples were sulfur deficient. The presence of Ce3+ species in the Ce-doped samples was confirmed by the X-ray photoelectron spectroscopy technique. UV–vis spectroscopy indicated that all samples had a blue shift of optical bandgap compared to bulk ZnS. According to the room-temperature photoluminescence studies, the spectra of Ce-doped ZnS nanocrystals exhibited a broad band emission consisting of UV and blue components, associated with ZnS defects, and a green component due to the 5d-4f transition of Ce3+. [ABSTRACT FROM AUTHOR] more...
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- 2023
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140. Glutathione-Capped ZnS Quantum Dots-Urease Conjugate as a Highly Sensitive Urea Probe.
- Author
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Metwly, Wafaa, Fadl, Eman, Soliman, Moataz, Ebrahim, Shaker, and Sabra, Sally A.
- Subjects
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GLUTATHIONE , *UREA , *TRANSMISSION electron microscopes , *UREASE , *ULTRAVIOLET spectroscopy , *QUANTUM dots , *ZETA potential , *X-ray diffraction - Abstract
Quantum dots (QDs) possess characteristic chemical and optical features. In this light, ZnS QDs capped with glutathione (GSH) were synthesized via an easy aqueous co-precipitation technique. Fabricated QDs were characterized in terms of X-ray diffraction (XRD), high resolution transmission electron microscope (HRTEM), Fourier transform infrared (FTIR) and Zeta potential analyses. Optical properties were examined using photoluminescence (PL) and ultraviolet–visible (UV–visible) spectroscopies. Moreover, GSH-capped ZnS QDs were evaluated as an optical probe for non-enzymatic detection of urea depending on the quenching of PL intensity of ZnS QDs in the presence of urea from concentration range of 0.5–5 mM with a correlation coefficient (R2) of 0.995, sensitivity of 0.0875 mM−1 and LOD of 0.426 mM. Furthermore, GSH-capped ZnS QDs-urease conjugate was utilized as an optical probe for enzymatic detection of urea in the range from 1.0 µM to 5.0 mM. Interestingly, it was observed that urea has a good affinity towards ZnS QDs-urease conjugate with a linear relationship between the change of PL intensity and urea concentration. It was found that R2 is 0.997 with a sensitivity of 0.042 mM−1 for mM concentration (0.5–5 mM) and LOD of 0.401 mM. In case of µM concentration range (1–100 µM), R2 was 0.971 with a sensitivity of 0.0024 µM−1 and LOD of 0.687 µM. These data suggest that enzyme conjugation to capped QDs might improve their sensitivity and applicability. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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141. ZNSwap: un-Block your Swap.
- Author
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BERGMAN, SHAI, CASSEL, NIKLAS, BJØRLING, MATIAS, and SILBERSTEIN, MARK
- Subjects
SANITATION workers ,DATA management ,SOLID state drives - Abstract
We introduce ZNSwap, a novel swap subsystem optimized for the recent Zoned Namespace (ZNS) SSDs. ZNSwap leverages ZNS’s explicit control over data management on the drive and introduces a space-efficient host-side Garbage Collector (GC) for swap storage co-designed with the OS swap logic. ZNSwap enables cross-layer optimizations, such as direct access to the in-kernel swap usage statistics by the GC to enable fine-grain swap storage management, and correct accounting of the GC bandwidth usage in the OS resource isolation mechanisms to improve performance isolation in multi-tenant environments. We evaluate ZNSwap using standard Linux swap benchmarks and two production key-value stores. ZNSwap shows significant performance benefits over the Linux swap on traditional SSDs, such as stable throughput for different memory access patterns, and 10× lower 99th percentile latency and 5× higher throughput for memcached key-value store under realistic usage scenarios. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
142. A Comparative Study of ZnS–ZnO Nanocomposite Assembly for Photocatalytic Removal of Crystal Violet Dye.
- Author
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Gupta, Aayush, Kaur, Jagdeep, and Pandey, Om Prakash
- Subjects
- *
GENTIAN violet , *PRECIPITATION (Chemistry) , *NANOCOMPOSITE materials , *DIFFRACTION patterns , *OPTICAL spectra , *CHARGE carriers - Abstract
Herein, the effect of composition on the optical and photocatalytic performance of ZnS–ZnO composite is described. The composite samples are synthesized by chemical precipitation method using (NaOH + Na2S) mixture as the precipitating agent. The chemical composition of precipitating agent results in in situ formation of ZnO and ZnS. Lower content of NaOH in precipitating agent solution (1:3 by volume) exhibits the formation of ZnS, while, its higher concentration induces the phase separation with higher volume fraction of ZnO as observed from X‐ray diffraction patterns. Optical studies suggest the enhancement of visible absorption along with redshift in the absorption edge of composites as compared with bare ZnS nanoparticles (NPs). Moreover, the incorporation of ZnO with ZnS is also supported by optical emission spectra in which intense emission around 507 nm is associated with S‐species. ZnO encapsulation on ZnS NPs exhibits higher emission associated with O‐ defects as compared to S‐species. Since both are near‐UV excited semiconductors, both contribute toward the generation of charge carriers to produce radicals and hence photo‐oxidation of crystal violet dye. Further, little concentration of ZnO with ZnS NPs exhibits comparable photocatalytic efficiency (≈88%) that is observed with other ZnS–ZnO nanocomposite samples. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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143. Modifying the Optical Properties of ZnS for Optoelectronic Applications †.
- Author
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Raza, Ali, Noor, Hadia, Riaz, Saira, and Naseem, Shahzad
- Subjects
OPTICAL properties ,ZINC sulfide ,OPTOELECTRONICS ,X-ray diffraction ,PHOTOLUMINESCENCE - Abstract
Iron (Fe) doped zinc sulfide (ZnS) nanoparticles were prepared by thermolysis with varying concentrations of iron. X-ray diffraction (XRD) results revealed the zinc blende cubic structure of ZnS. The effect of iron on lattice parameters such as crystallite size, micro strains, and dislocation density was examined. The defect chemistry inside the samples was analyzed by photoluminescence spectroscopy (PL). The variation in PL intensity introduced by doping can be used in optical applications. The optical parameters of nanostructures were investigated with different doping and the incorporation of Fe substitute for Zn ions using UV-Visible (UV-Vis). [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
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144. Tuning the Spectroscopic and Electronic Characteristics of ZnS/SiC Nanostructures Doped Organic Material for Optical and Nanoelectronics Fields.
- Author
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Ahmed, Hind and Hashim, Ahmed
- Abstract
The current work aims to investigate of designing the polystyrene(PS)/zinc sulfide(ZnS)/silicon carbide(SiC) new nanostructures as a potential materials for optical and nanoelectronics applications with potential characteristics include few cost and low weight with excellent spectroscopic and electronic properties compared of other nanostructures. The structure, spectroscopic and electronic characters of PS/ZnS/SiC nanostructures were explored. The optical and electronic characteristics included the total energy, ionization potential, HOMO/LUMO energies, electron affinity, chemical hardness, electronegativity, chemical softness, electrophilicity, dipole moment, electrostatic surfaces potential(ESP), Raman and IR-Spectrums, and density of states. The results indicated that the PS/ZnS/SiC nanostructures have wide absorption spectrum and good spectroscopic characteristics with band gap(1.327 eV) which make it appropriate for a variety of nanooptics and nanoelectronics fields. The absorption of PS shifted to the higher wavelength by adding the ZnS/SiC nanostructures which can be functional in various optical fields. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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- View/download PDF
145. Practical Characteristics of Photosensors Based on Semiconductor–Electrolyte Contact.
- Author
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Demidenko, I. V.
- Abstract
The features of the deviation of the open circuit potential at the semiconductor–electrolyte contact where cadmium and zinc sulfides are used as semiconductor materials are considered. Models of equivalent electrical circuits that explain the observed phenomena are proposed. Some examples of devices designed on the basis of the research results are given. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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146. One-step preparation of MoOx/ZnS/ZnO composite and its excellent performance in piezocatalytic degradation of Rhodamine B under ultrasonic vibration.
- Author
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Zheng, Song, Li, Xiaojing, Zhang, Jiayu, Wang, Junfeng, Zhao, Chunran, Hu, Xin, Wu, Ying, and He, Yiming
- Subjects
- *
RHODAMINE B , *ZINC sulfide , *X-ray photoelectron spectroscopy , *ZINC oxide , *PIEZOELECTRICITY , *TRANSMISSION electron microscopy - Abstract
This paper synthesized a new type of ternary piezoelectric catalyst MoO x /ZnS/ZnO (MZZ) by a one-step method. The catalytic degradation of Rhodamine B (RhB) solution (10 µg/g, pH = 7.0) shows that the composite catalyst has excellent piezoelectric catalytic activity under ultrasonic vibration (40 kHz). The piezoelectric degradation rate of the optimal sample reached 0.054 min−1, which was about 2.5 times that of pure ZnO. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman, transmission electron microscopy (TEM), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS) technologies were used to analyze the structure, morphology, and interface charge transfer properties of the MZZ piezocatalysts. The results showed that the composite catalyst may have a core-shell structure. ZnS is coated on the surface of ZnO, while MoO x adheres to the surface of ZnS. This structure endowed MZZ larger specific surface area than ZnO, which benefits the RhB adsorption. More importantly, the formed heterojunction structure between ZnS and ZnO promotes the separation of positive and negative charges induced by the piezoelectric effect. MoO x species may act as a charge trap to further promote more carriers to participate in the reaction. In addition, MoO x may also be beneficial in adsorbing dyes. Active species capture experiments show that superoxide radicals and holes are the main active species in piezoelectric catalytic reactions on MZZ catalysts. [Display omitted] [ABSTRACT FROM AUTHOR] more...
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- 2023
- Full Text
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147. Photocatalytic Evaluation of the Ternary Composite CdSO 4 -ZnAl LDH/ZnS in Hydrogen Production without a Sacrificial Reagent.
- Author
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Romero-Villegas, Angela G., Tzompantzi-Flores, Clara, Hernández, Raúl Pérez, Barrera-Rodríguez, Arturo, Tzompantzi, Francisco, and Gómez, Ricardo
- Subjects
- *
INTERSTITIAL hydrogen generation , *LAYERED double hydroxides , *PHOTOCATALYSTS , *HYDROGEN production , *SULFURATION , *X-ray diffraction , *ZINC sulfide , *HYDROXIDES - Abstract
In this work, a layered double hydroxide support modified with cadmium was synthesized by a one-pot coprecipitation method. Then, it was sulfured in different percentages by a solvothermal method. Next, the samples were analyzed using various characterization techniques like XRD, DRS, FTIR, N2 physisorption, PL spectroscopy, TEM, and SEM. Finally, the synthesized and uncalcined materials were assessed in hydrogen production from water and a methanol-water solution under UV-light irradiation. The results showed that the sulphuration improves the photocatalytic activity, reaching a maximum rate constant of hydrogen production of 7403 µmol/g∙h in a methanol-water solution and 1326 µmol/g∙h in water. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
148. Antibacterial studies of ZnO and silica capped manganese doped zinc sulphide nanostructures.
- Author
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Kumar, Sunil, Jain, Anita, Panwar, Sanjay, Sharma, Indu, Gupta, Suhaas, Dopita, Milan, and Choubey, Ravi Kant
- Subjects
- *
GRAM-negative bacteria , *ZINC sulfide , *NANOSTRUCTURES , *ESCHERICHIA coli , *MANGANESE , *SPHALERITE , *ZINC oxide - Abstract
To investigate a potential new antibacterial agent to combat increasing antimicrobial resistance, undoped and 1% manganese doped Zinc Sulphide quantum dots (ZnS and Zn0.99Mn0.01S QDs, respectively) were synthesised by co-precipitation method and capped with increasing amounts of Zinc Oxide and Silica in aqueous media to prepare ZnS@ZnO, Zn0.99Mn0.01S@ZnO, and Zn0.99Mn0.01S@SiO2 nanostructures. P-XRD analysis confirmed the cubic zinc-blende phase of the seed ZnS QDs, Zn0.99Mn0.01S QDs, and Zn0.99Mn0.01S@SiO2 nanostructures, and the wurtzite phase of the ZnO in the ZnS@ZnO and Zn0.99Mn0.01S@ZnO nanostructures, further confirmed using TEM studies, which also revealed the size of the largest nanostructures to be in the range of a hundred nanometres. FTIR spectroscopy illustrated the quenching of characteristic ZnS peaks with increasing capping material. UV–Visible absorption spectroscopy and subsequent Tauc analysis illustrated the strong size confinement of the synthesised ZnS and Zn0.99Mn0.01S QDs; Brus equation calculations revealed that the particle size of the samples increases with increasing capping material. Photoluminescent emission spectroscopy illustrated the tuneable emission properties of the prepared nanostructures; manganese doping induced the characteristic orange emission in the Zn0.99Mn0.01S QDs, which was enhanced by ZnO, but quenched by SiO2. The antimicrobial activity of all the prepared samples was qualitatively evaluated using well known Agar well diffusion method against six human pathogenic bacteria: Gram positive Bacillus subtilis and Staphylococcus aureus; Gram negative Salmonella Typhi, Escherichia coli, Klebsiella pneumoniae and Pseudomonas aeruginosa. Qualitative antibacterial assay confirmed the high antibacterial potential of the synthesised ZnS and Zn0.99Mn0.01S QDs, especially against E. coli. Increasing ZnO amount improves the antibacterial activity of the nanostructures against different Gram-positive bacterial strains, while increasing SiO2 amount improves the antibacterial activity of the nanostructures against both Gram positive strains and three of the four Gram negative bacterial strains. Thus, the positive results suggest that the prepared ZnS@ZnO, Zn0.99Mn0.01S@ZnO, and Zn0.99Mn0.01S@SiO2 nanostructures should be further studied as antimicrobial agents. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
149. Preparation, Properties, and Characterization of ZnS Nanoparticles †.
- Author
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Ali, Amani H., Hashem, Hassan Abd-elhamid, and Elfalaky, Ahmed
- Subjects
ZINC sulfide ,CRYSTAL structure ,ELECTRIC properties ,NANOPARTICLE synthesis ,X-ray diffraction - Abstract
In this paper, the structural, microstructural, thermal, electrical, and dielectric properties of synthesized ZnS nanoparticles are studied using the co-precipitation technique. The precipitate was characterized using X-ray diffraction (XRD). Characterization was confirmed via formation of a single-phase cubic nanocrystal line structure. The crystalline size was obtained using three different models. Information regarding thermal transition such as melting, oxidation, and crystallization was revealed using differential scanning calorimetry and thermogravimetry (DTG/TG). Transmission electron microscopy (TEM) images were obtained to explore the stability, morphology, and other properties of the ZnS nanoparticles. Regarding the crystallite size of the prepared ZnS, different techniques were utilized to estimate the crystallite size, and the calculations confirmed the formation of the ZnS in nanocrystal form. The electrical properties of the synthesized nanocrystals were measured at different temperatures (293–373 K) over a wide range of frequencies from about (50 Hz up to 5 MHz). Regarding the frequency dependence of the A.C conductivity and the Activation energy (E
a ) was found to decrease as the frequency increase. [ABSTRACT FROM AUTHOR] more...- Published
- 2023
- Full Text
- View/download PDF
150. Effect of the Surface Passivation on the I‒V Characteristics of the XBn-InGaAs Focal Plane Arrays.
- Author
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Trukhachev, A. V., Trukhacheva, N. S., Sednev, M. V., and Boltar, K. O.
- Subjects
FOCAL plane arrays sensors ,SURFACE passivation ,ZINC sulfide ,DIELECTRIC materials ,MAGNETRON sputtering - Abstract
The effect of the properties and materials of a passivation coating and the low-energy argon ion flux on the I‒V characteristics of the XBn-InGaAs focal plane arrays has been studied. Passivation coatings have been obtained by magnetron and resistive sputtering of dielectric materials (zinc sulfide ZnS, silicon monoxide SiO, and yttrium fluoride YF
3 ). It is shown that the exposure to low-energy argon ions leads to a catastrophic increase in the dark currents in non-passivated array elements. [ABSTRACT FROM AUTHOR] more...- Published
- 2023
- Full Text
- View/download PDF
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