Journal
ADVANCED OPTICAL MATERIALS
Volume 2, Issue 8, Pages 738-745Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201400086
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Funding
- National Natural Science Foundation of China [51372273, 51201180, 21204100]
- One Hundred Talents program of Chinese Academy of Sciences [Y12H981601]
- Western Light program of Chinese Academy of Sciences [LHXZ201102]
- International Scientific Cooperation Program of Xinjiang [20136008]
- Xinjiang Science Foundation for Distinguished Young Scholars [2013711015]
- SRF for ROCS, SEM
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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.
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