CuO/ZnO Heterostructured Nanorods: Photochemical Synthesis and the Mechanism of H2S Gas Sensing
SCIE
SCOPUS
- Title
- CuO/ZnO Heterostructured Nanorods: Photochemical Synthesis and the Mechanism of H2S Gas Sensing
- Authors
- Kim, J; Kim, W; Yong, K
- Date Issued
- 2012-07-26
- Publisher
- ACS
- Abstract
- This study reports on the structural properties of CuO/ZnO nanorods and the mechanism by which bundles of these nanorods are able to sense H2S gas. The CuO/ZnO nanorods were prepared by deposition of CuO nanostructures on the hydrothermally grown ZnO nanorods using a photochemical method. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to confirm that the heterogeneous nanostructure of the CuO/ZnO nanorods was highly crystalline. The H2S gas sensing properties of CuO/ZnO nanorod bundles was evaluated in air containing dilute H2S gas at sensing temperatures (T-s) <= 500 degrees C. The response of CuO/ZnO nanorod sensors to H2S gas was enhanced compared to that of bare ZnO nanorods. The heterostructured nanorods showed an exponential increase in sensing tendency with T-s. X-ray photoelectron spectroscopy analysis results indicated that the enhanced response of CuO/ZnO nanorod sensors is due to the chemical conversion of CuO into CuS upon H2S exposure, which acts as an electrical gate in the CuO/ZnO sensor.
- Keywords
- THIN-FILMS; SENSORS; CUO; OXIDE; FABRICATION; SURFACES; COPPER
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/15653
- DOI
- 10.1021/JP302129J
- ISSN
- 1932-7447
- Article Type
- Article
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY C, vol. 116, no. 29, page. 15682 - 15691, 2012-07-26
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