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15 results on '"Chen, Da-Qin"'

6. Enhancment of Upconversion Luminescence of Lanthanide-doped Nanocrystals Through Non-lanthanide Ions Doping Core-shell Nanoarchitecture

Author

马丹阳 Ma Dan-yang, 潘雅静 Pan Ya-jing, 戴建斌 Dai Jian-bin, 季振国 Ji Zhen-guo, 陈大钦 Chen Da-qin, 李雨亭 Li Yu-ting, 胡琪唯 Hu Qi-wei, and 丁明烨 Ding Ming-ye

Subjects
Core shell, Lanthanide, Radiation, Materials science, Upconversion luminescence, Doping, Condensed Matter Physics, Photochemistry, Doped nanocrystals, Electronic, Optical and Magnetic Materials, Ion
Published
2016

10. MoS 2 -graphene/ZnIn 2 S 4 hierarchical microarchitectures with an electron transport bridge between light-harvesting semiconductor and cocatalyst: A highly efficient photocatalyst for solar hydrogen generation

Author

Yuan, Yong-Jun, primary, Tu, Ji-Ren, additional, Ye, Zhi-Jun, additional, Chen, Da-Qin, additional, Hu, Bin, additional, Huang, Yan-Wei, additional, Chen, Ting-Ting, additional, Cao, Da-Peng, additional, Yu, Zhen-Tao, additional, and Zou, Zhi-Gang, additional

Published
2016
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14. MoS2 Nanosheet-Modified CuInS2 Photocatalyst for Visible-Light-Driven Hydrogen Production from Water.

Author

Yuan, Yong‐Jun, Chen, Da‐Qin, Huang, Yan‐Wei, Yu, Zhen‐Tao, Zhong, Jia‐Song, Chen, Ting‐Ting, Tu, Wen‐Guang, Guan, Zhong‐Jie, Cao, Da‐Peng, and Zou, Zhi‐Gang

Subjects
MOLYBDENUM disulfide, PHOTOCATALYSTS, NANOCRYSTALS, HYDROGEN production, WATER
Abstract

Exploiting photocatalysts respond to visible light is of huge challenge for photocatalytic H2 production. Here, we synthesize a new composite material consisting of few-layer MoS2 nanosheets grown on CuInS2 surface as an efficient photocatalyst for solar H2 generation. The photocatalytic results demonstrate that the 3 wt % MoS2/CuInS2 photocatalyst exhibits the highest H2 generation rate of 316 μmol h−1 g−1 under visible light irradiation, which is almost 28 times higher than that of CuInS2. Importantly, the MoS2/CuInS2 photocatalyst shows a much higher photocatalytic activity than that of Pt-loaded CuInS2 photocatalyst. The enhanced photocatalytic activities of MoS2/CuInS2 photocatalysts can be attributed to the improved charge separation at the interface of MoS2 and CuInS2, which is demonstrated by the significant enhancement of photocurrent responses in MoS2/CuInS2 photoelectrodes. This work presents a noble-metal-free photocatalyst that responds to visible light for solar H2 generation. [ABSTRACT FROM AUTHOR]

Published
2016
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15. Upconversion Emission of Infrared Excited Er3+-Doped Transparent Glass Ceramics Containing CaF2 Nano-Crystals

Author

Chen, Da Qin, Wang, Yuan Sheng, and Yu, Yun Long

Abstract

Upconversion luminescence of Er3+-doped SiO2-Al2O3-CaO-NaF-CaF2 transparent glass ceramics under 980 nm excitation was investigated. XRD and TEM experiments revealed the homogeneous distribution of CaF2 nano-crystals among the glassy matrix. Intense red upconversion signal was recorded and its intensity increased with the increasing of heating temperature and Er3+-doping level at the range of 0.1 to 1.0 mol%. When Er3+ doping reached 2 mol%, the concentration quenching effect appeared. All these results could be due to the incorporation of Er3+ ions into precipitated CaF2 nano-crystals. The quadratic pump power dependence of the upconversion luminescence intensity indicated that the transition mechanism of the red emission was due to two-photon absorption processes.

Published
2007
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