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CdS/ZnO Core/Shell Nanowire-Built Films for Enhanced Photodetecting and Optoelectronic Gas-Sensing Applications
Yang, Zheng; Guo, Linjuan; Zu, Baiyi; Guo, Yanan; Xu, Tao; Dou, Xincun
2014
Source PublicationADVANCED OPTICAL MATERIALS
ISSN2195-1071
Volume2Issue:8Pages:738-745
Abstract

Uniform CdS/ZnO core/shell nanowires are hydrothermally synthesized using a two-step process and assembled into a photodetector and a NO2 optoelectronic sensor for the first time. The corresponding photodetector exhibits a fast, reversible, and stable optoelectronic response with a rise time of similar to 26 ms, a decay time of similar to 2.1 ms and a stability of over 5 months. The remarkable photosensitivity and fast photoresponse are attributed to the formation of a heterojunction structure between CdS and ZnO, which greatly inhibits the recombination of photoinduced electrons and holes. The CdS/ZnO core/shell nanowires also show an excellent visible-light-activated gas sensing performance towards ppb-level NO2 at room temperature. The responses range from 6.7% to 337% toward NO2 concentrations of 5 to 1000 ppb. It is found that the sensitivity of the NO2 sensor is dependent on the illuminated light intensity with a maximum value at 0.68 mW/cm(2). The sensing mechanisms of the CdS/ZnO nanowires under visible-light irradiation and the influence of light intensity are also discussed. The present CdS/ZnO core/shell nanowire not only benefits the fabrication of efficient photo-detectors, but also makes the instant, optically controlled sensing of ppb-level NO2 gas possible.

DOI10.1002/adom.201400086
Indexed BySCI
WOS IDWOS:000341180400006
Citation statistics
Cited Times:40[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/3752
Collection环境科学与技术研究室
Corresponding AuthorZu, Baiyi
Affiliation1.Chinese Acad Sci, Lab Environm Sci & Technol, Xinjiang Tech Inst Phys & Chem, Key Lab Funct Mat & Devices Special Environm, Urumqi 830011, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.No Illinois Univ, Dept Chem & Biochem, De Kalb, IL 60115 USA
Recommended Citation
GB/T 7714
Yang, Zheng,Guo, Linjuan,Zu, Baiyi,et al. CdS/ZnO Core/Shell Nanowire-Built Films for Enhanced Photodetecting and Optoelectronic Gas-Sensing Applications[J]. ADVANCED OPTICAL MATERIALS,2014,2(8):738-745.
APA Yang, Zheng,Guo, Linjuan,Zu, Baiyi,Guo, Yanan,Xu, Tao,&Dou, Xincun.(2014).CdS/ZnO Core/Shell Nanowire-Built Films for Enhanced Photodetecting and Optoelectronic Gas-Sensing Applications.ADVANCED OPTICAL MATERIALS,2(8),738-745.
MLA Yang, Zheng,et al."CdS/ZnO Core/Shell Nanowire-Built Films for Enhanced Photodetecting and Optoelectronic Gas-Sensing Applications".ADVANCED OPTICAL MATERIALS 2.8(2014):738-745.
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