期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 147, 期 1, 页码 234-240出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2010.03.003
关键词
Visible-light-induced photoelectric gas sensor; Photocurrent; CdS NPs/ZnO heterostructures; Formaldehyde detecting
资金
- National Basic Research Program of China (973 Program) [2007CB613303]
- National Natural Science Foundation of China [20673049, 20703020, 20873053]
- Dalian University of Technology [KLIEEE-08-03]
A visible-light-induced gas sensing element based on the heterostructures of CdS nanoparticles (NPs)/ZnO microcrystals has been successfully developed. Commercial ZnO microcrystals were coated with CdS nanoparticles by a sonochemical method to form the heterostructures. Compared with native CdS NPs, the as-obtained CdS NPs/ZnO showed enhanced photocurrent intensity. And the heterostructures-based element exhibited an excellent performance of photoelectric gas sensing to formaldehyde induced by visible-light. Moreover, the photocurrent intensity and sensitivity to formaldehyde were controllable by tuning the amount of CdS NPs attached on the surface of ZnO microcrystals. A possible explanation on the sensing mechanism has been proposed. In addition, the gas sensing element possessed good reproducibility. Our results demonstrate that the heterostructures of CdS NPs/ZnO is an efficient and promising material for visible-light-induced photoelectric gas sensors working at room temperature. (c) 2010 Elsevier B.V. All rights reserved.
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