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学科主题: 物理化学
题名: Effects of surface modification on photocatalytic activity of CdS nanocrystals studied by photoluminescence spectroscopy
作者: Huang, Lei1;  Yang, Jinhui1;  Wang, Xiuli1;  Han, Jingfeng1;  Han, Hongxian1;  Li, Can1
通讯作者: 李灿
刊名: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
发表日期: 2013
DOI: 10.1039/c2cp41153a
卷: 15, 期:2, 页:553-560
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 503
产权排名: 1,1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Physics
英文摘要: The surface features of semiconductors play very important roles in photocatalytic processes but they are far from being well understood. In this work, we used CdS nanocrystals (NCs) as a model semiconductor photocatalyst to investigate the influence of surface features on photocatalytic activity. The effects of surface modification on the recombination behavior were studied by photoluminescence (PL) spectroscopy. The surface of CdS NCs was modified by tuning the surface S/Cd ratio or by co-loading with Pt and/or PdS co-catalysts. It was found that the surface modifications significantly affect the emission bands at similar to 540 nm due to shallow traps and similar to 650 nm assigned to S2- vacancies, and consequently the photocatalytic activities. Without co-catalysts loading, the excited carriers are readily transferred to the shallow traps, while they are readily transferred to the co-catalysts upon co-catalysts loading. These results demonstrate that the surface features are crucial to photocatalytic activity of the CdS NCs. The surface modification is helpful for the excited carriers to transfer to either the shallow trap states or co-catalysts, resulting in higher quantum efficiency of photocatalytic H-2 production.
关键词[WOS]: VISIBLE-LIGHT IRRADIATION ;  QUANTUM DOTS ;  SEMICONDUCTOR NANOCRYSTALS ;  COLLOIDAL CDS ;  TIO2 ;  H-2 ;  ENHANCEMENT ;  PARTICLES ;  COMPOSITE ;  SCIENCE
语种: 英语
WOS记录号: WOS:000311963600019
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/117570
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Natl Lab Clean Energy, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Huang, Lei,Yang, Jinhui,Wang, Xiuli,et al. Effects of surface modification on photocatalytic activity of CdS nanocrystals studied by photoluminescence spectroscopy[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2013,15(2):553-560.
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