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Visible-light-induced photoelectric gas sensing to formaldehyde based on CdS nanoparticles/ZnO heterostructures

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Authors
Zhai, J.
Wang, D.
Peng, L.
Lin, Y.
Li, Xin Yong
Xie, T.
Date
2010
Type
Journal Article

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Zhai, J. and Wang, D. and Peng, L. and Lin, Y. and Li, X.Y. and Xie, T. 2010. Visible-light-induced photoelectric gas sensing to formaldehyde based on CdS nanoparticles/ZnO heterostructures. Sensors and Actuators B. 147 (1): pp. 234-240.
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Sensors and Actuators B
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Department of Chemical Engineering
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Abstract

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. © 2010 Elsevier B.V. All rights reserved.