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Your search keyword '"Zhao, Haiguang"' showing total 602 results
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602 results on '"Zhao, Haiguang"'

151. Experimental study on safe disposal of As slag and As contaminated soil by new olidification/stabilization(S/S) agent TY-Z

Author

Duan Yijun, Zhao Haiguang, Tong Wang, Yang Zixuan, Sun Jing, Tingtao Bi, Wenwei Wu, Wang Shuting, Chen Chen, and Mina Wu

Subjects
Waste management, visual_art, visual_art.visual_art_medium, Environmental science, Slag, Soil contamination
Abstract

Taking the smelting waste residue of arsenic plant I and II and the contaminated soil around them as the research object, the solidification/stabilization tests of the four pollutants were carried out with TY-Z, A, B and C agents. The test results show that the cost and solidification/stabilization effect of the new agent TY-Z are better than those of the other three agents, and the toxicity leaching amount of TY-Z is much lower than the standard for pollution control on the security landfill site for hazardous wastes(GB18598-2001). Through the phase analysis, microscopic morphology analysis and morphological analysis of As pollutants, the results show that the solidification/stabilization effect of the new agent TY-Z is better than that of the other three agents.

Published
2021

152. Red and green-emitting biocompatible carbon quantum dots for efficient tandem luminescent solar concentrators.

Author

Han, Yi, Zhao, Xiujian, Vomiero, Alberto, Gong, Xiao, and Zhao, Haiguang

Abstract

Luminescent solar concentrators (LSCs) are large-scale sunlight collectors, consisting of fluorophores embedded in waveguides, which can concentrate part of the absorbed sunlight at the borders of the slab through wave-guided photoluminescence. Benefiting from their low-cost and semi-transparency, they exhibit great potential for building integrated photovoltaics. Among various types of fluorophores, carbon quantum dots (C-dots) have attracted great interest due to their relatively high quantum yield (QY), low-cost, non-toxic composition and simple synthetic methods. Unfortunately, most red-emitting C-dots with high QYs were synthesized using relatively toxic and expensive precursors. The C-dots exhibiting red-emission synthesized using sustainable precursors (e.g. citric acid) have QYs less than 20%. Here we synthesized the red-emitting C-dots produced by using citric acid and urea as precursors and N,N-diethylformamide as the solvent via a solvothermal reaction. The red C-dots have a broad absorption from 300–650 nm, with a QY as high as 40% in ethanol. In addition, the C-dots exhibited good biocompatibility, even for a C-dot concentration up to 1000 μg mL−1. The LSC (LSC area 100 cm2) based on red C-dots exhibited a solar-to-electricity power conversion efficiency (PCE) of 1.9% under natural sunlight illumination (35 mW cm−2). We combined red-emitting C-dots with green-emitting C-dots prepared via a vacuum heating approach. By using a tandem structure, composed of two slabs each incorporating a different C-dot type, the obtained PCE of the LSC based on the combination of red and green C-dots further increases up to 2.3% (under the same irradiance equal to 35 mW cm−2), which is comparable to the reported PCEs for the LSCs based on C-dots or other types of fluorophores. This work indicates that the red-emitting C-dots produced by low-cost and environmentally-friendly precursors exhibit great potential as building blocks for the environmentally compatible LSCs. [ABSTRACT FROM AUTHOR]

Published
2021
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153. Boosting efficiency of luminescent solar concentrators using ultra-bright carbon dots with large Stokes shiftElectronic supplementary information (ESI) available. See DOI: https://doi.org/10.1039/d2nh00360k

Author

Li, Jiurong, Zhao, Haiguang, Zhao, Xiujian, and Gong, Xiao

Abstract

Luminescent solar concentrators (LSCs) are able to collect sunlight from a large-area to generate electric power with a low cost, showing great potential in building-integrated photovoltaics. However, the low efficiency of large-area LSCs caused by the reabsorption losses is a critical issue that hampers their practical applications. In this work, we synthesized novel yellow emissive carbon dots (CDs) with a large Stokes shift of 193 nm, which exhibit nearly zero reabsorption. The quantum yield (QY) of the yellow emitting CDs is up to 61%. The yellow emitting CDs can be employed to fabricate high-performance large-area LSCs due to successful suppression of the reabsorption losses. The as-prepared LSCs are able to absorb 14% of the sunlight as the absorption of the CDs matches well with the sun's spectrum. The large-area LSC (10 × 10 cm2) with a laminated structure based on the yellow emitting CDs achieves an optical conversion efficiency (ηopt) of 4.56% and power conversion efficiency (ηPCE) of 4.1% under natural sunlight (45 mW cm−2), which are significantly higher than other previously reported works with similar sizes. Furthermore, the prepared high-performance LSCs show good stability. This method of synthesizing novel CDs for high-efficiency LSCs provides a useful platform for future study and practical application of LSCs.

Published
2022
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160. Efficient solar-driven hydrogen generation using colloidal heterostructured quantum dots

Author

Wang, Kanghong, primary, Tong, Xin, additional, Zhou, Yufeng, additional, Zhang, Hui, additional, Navarro-Pardo, Fabiola, additional, Selopal, Gurpreet S., additional, Liu, Guiju, additional, Tang, Jie, additional, Wang, Yiqian, additional, Sun, Shuhui, additional, Ma, Dongling, additional, Wang, Zhiming M., additional, Vidal, François, additional, Zhao, Haiguang, additional, Sun, Xuhui, additional, and Rosei, Federico, additional

Published
2019
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172. Peripheral arterial occlusive disease: Global gene expression analyses suggest a major role for immune and inflammatory responses

Author

Du Yanzhi, Zhou Jianqin, Ohno-Machado Lucila, Crawford Keith, Abzhanov Arhat, Shi Jiantao, Zhao Haiguang, Fu Shijun, Kuo Winston, Zhang Ji, Jiang Mier, and Jin Jason

Subjects
Biotechnology, TP248.13-248.65, Genetics, QH426-470
Abstract

Abstract Background Peripheral arterial disease (PAD), a major manifestation of atherosclerosis, is associated with significant cardiovascular morbidity, limb loss and death. However, mechanisms underlying the genesis and progression of the disease are far from clear. Genome-wide gene expression profiling of clinical samples may represent an effective approach to gain relevant information. Results After histological classification, a total of 30 femoral artery samples, including 11 intermediate lesions, 14 advanced lesions and 5 normal femoral arteries, were profiled using Affymetrix microarray platform. Following real-time RT-PCR validation, different algorithms of gene selection and clustering were applied to identify differentially expressed genes. Under a stringent cutoff, i.e., a false discovery rate (FDR) Conclusion Lines of evidence revealed in this study not only support previous hypotheses, primarily based on studies of animal models and other types of arterial disease, that inflammatory responses may influence the development of PAD, but also permit the recognition of a wide spectrum of immune/inflammatory genes that can serve as signatures for disease progression in PAD. Further studies of these signature molecules may eventually allow us to develop more sophisticated protocols for pharmaceutical interventions.

Published
2008
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173. Synergistic Effect of Plasmonic Gold Nanoparticles Decorated Carbon Nanotubes in Quantum Dots/TiO2 for Optoelectronic Devices.

Author

Selopal, Gurpreet Singh, Mohammadnezhad, Mahyar, Besteiro, Lucas V., Cavuslar, Ozge, Liu, Jiabin, Zhang, Hui, Navarro‐Pardo, Fabiola, Liu, Guiju, Wang, Maorong, Durmusoglu, Emek G., Acar, Havva Yagci, Sun, Shuhui, Zhao, Haiguang, Wang, Zhiming M., and Rosei, Federico

Subjects
GOLD nanoparticles, CARBON nanotubes, MULTIWALLED carbon nanotubes, OPTOELECTRONIC devices, NANOPARTICLES, ELECTRON impact ionization, QUANTUM dots, PHOTOCATHODES
Abstract

Here, a facile approach to enhance the performance of solar‐driven photoelectrochemical (PEC) water splitting is described by means of the synergistic effects of a hybrid network of plasmonic Au nanoparticles (NPs) decorated on multiwalled carbon nanotubes (CNTs). The device based on TiO2–Au:CNTs hybrid network sensitized with colloidal CdSe/(CdSexS1−x)5/(CdS)1 core/alloyed shell quantum dots (QDs) yields a saturated photocurrent density of 16.10 ± 0.10 mA cm−2 [at 1.0 V vs reversible hydrogen electrode (RHE)] under 1 sun illumination (AM 1.5G, 100 mW cm−2), which is ≈26% higher than the control device. The in‐depth mechanism behind this significant improvement is revealed through a combined experimental and theoretical analysis for QDs/TiO2–Au:CNTs hybrid network and demonstrates the multifaceted impact of plasmonic Au NPs and CNTs: i) hot‐electron injection from Au NPs into CNTs and TiO2; ii) near‐field enhancement of the QDs absorption and carrier generation/separation processes by the plasmonic Au NPs; iii) enhanced photoinjected electron transport due to the highly directional pathways offered by CNTs. These results provide fundamental insights on the properties of QDs/TiO2–Au:CNTs hybrid network, and highlights the possibility to improve the performance of other solar technologies. [ABSTRACT FROM AUTHOR]

Published
2020
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174. Preliminary study on the optical properties of Lake Gehu

Author

Li Yong, Pan Jizheng, HE Shangwei, and Zhao Haiguang

Subjects
Hydrology, Oceanography, Earth and Planetary Sciences (miscellaneous), Environmental science, Aquatic Science, Pollution, Water Science and Technology
Published
2014

176. Aggregation-Induced Enhanced Red Emission Graphene Quantum Dots for Integrated Fabrication of Luminescent Solar Concentrators

Author

Li, Jiurong, Zhao, Haiguang, Zhao, Xiujian, and Gong, Xiao

Abstract

Graphene quantum dots (GQDs) commonly suffer from the fluorescence problem of aggregation-caused quenching under high-concentration loading or in the solid state, which seriously hinders the application. Here we report a type of GQDs with red aggregation-induced enhanced emission (AIEE). It is confirmed that the aggregation state of the AIEE GQDs is a J-aggregate. The GQDs/poly(methyl methacrylate) film presented a photoluminescence quantum yield as high as 60.81%, and the record-high performance of luminescent solar concentrators (LSCs) was achieved. The power conversion efficiency (ηPCE) is up to 8.35% and the external optical efficiency (ηext) is ∼8.99% for the GQD-based LSCs (45 mW/cm2). Even under one sun illumination (100 mW/cm2), the corresponding ηPCEand ηextvalues are 3.12% and 4.52%, respectively. The internal photon efficiency (ηint) of an LSC device is about 5.02%. The synthesis of AIEE GQDs bridges the research gap in the emission mechanism of AIEE in GQDs.

Published
2024
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177. Structure/Property Relations in “Giant” Semiconductor Nanocrystals: Opportunities in Photonics and Electronics

Author

Navarro-Pardo, Fabiola, Zhao, Haiguang, Wang, Zhiming M., and Rosei, Federico

Abstract

Semiconductor nanocrystals exhibit size-tunable absorption and emission ranging from the ultraviolet (UV) to the near-infrared (NIR) spectral range, high absorption coefficient, and high photoluminescence quantum yield. Effective surface passivation of these so-called quantum dots (QDs) may be achieved by growing a shell of another semiconductor material. The resulting core/shell QDs can be considered as a model system to study and optimize structure/property relations. A special case consists in growing thick shells (1.5 up to few tens of nanometers) to produce “giant” QDs (g-QDs). Tailoring the chemical composition and structure of CdSe/CdS and PbS/CdS g-QDs is a promising approach to widen the spectral separation of absorption and emission spectra (i.e., the Stokes shift), improve the isolation of photogenerated carriers from surface defects and enhance charge carrier lifetime and mobility. However, most stable systems are limited by a thick CdS shell, which strongly absorbs radiation below 500 nm, covering the UV and part of the visible range. Modification of the interfacial region between the core and shell of g-QDs or tuning their doping with narrow band gap semiconductors are effective approaches to circumvent this challenge. In addition, the synthesis of g-QDs composed of environmentally friendly elements (e.g., CuInSe2/CuInS2) represents an alternative to extend their absorption into the NIR range. Additionally, the band gap and band alignment of g-QDs can be engineered by proper selection of the constituents according to their band edge positions and by tuning their stoichiometry during wet chemical synthesis. In most cases, the quasi-type II localization regime of electrons and holes is achieved. In this type of g-QDs, electrons can leak into the shell region, while the holes remain confined within the core region. This electron–hole spatial distribution is advantageous for optoelectronic devices, resulting in efficient electron–hole separation while maintaining good stability.

Published
2024
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182. Optoelectronic Properties in Near-Infrared Colloidal Heterostructured Pyramidal “Giant” Core/Shell Quantum Dots

Author

Tong, Xin, primary, Kong, Xiang-Tian, additional, Wang, Chao, additional, Zhou, Yufeng, additional, Navarro-Pardo, Fabiola, additional, Barba, David, additional, Ma, Dongling, additional, Sun, Shuhui, additional, Govorov, Alexander O., additional, Zhao, Haiguang, additional, Wang, Zhiming M., additional, and Rosei, Federico, additional

Published
2018
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199. Ultrasmall Nanoplatelets: The Ultimate Tuning of Optoelectronic Properties

Author

Zhou, Yufeng, primary, Celikin, Mert, additional, Camellini, Andrea, additional, Sirigu, Gianluca, additional, Tong, Xin, additional, Jin, Lei, additional, Basu, Kaustubh, additional, Barba, David, additional, Ma, Dongling, additional, Sun, Shuhui, additional, Vidal, François, additional, Zavelani‐Rossi, Margherita, additional, Wang, Zhiming M., additional, Zhao, Haiguang, additional, Vomiero, Alberto, additional, and Rosei, Federico, additional

Published
2017
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