4.6 Article

CuO/ZnO Heterostructured Nanorods: Photochemical Synthesis and the Mechanism of H2S Gas Sensing

期刊

JOURNAL OF PHYSICAL CHEMISTRY C
卷 116, 期 29, 页码 15682-15691

出版社

AMER CHEMICAL SOC
DOI: 10.1021/jp302129j

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资金

  1. National Research Foundation [NRF2010-0009545]
  2. Global Research Network Program [220-2011-1-C00033]
  3. Korean Research Foundation
  4. Korean Government (MOEHRD) [KRF-2008-005-J00501]
  5. National Research Foundation of Korea [2010-0009545] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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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.

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