Core鈥揝hell In2O3/ZnO Nanoarray Nanogenerator as a Self-Powered Active Gas Sensor with High H2S Sensitivity and Selectivity at Room Temperature

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• 作者：Weili Zang ; Yuxin Nie ; Dan Zhu ; Ping Deng ; Lili Xing ; Xinyu Xue
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：May 1, 2014
• 年：2014
• 卷：118
• 期：17
• 页码：9209-9216
• 全文大小：495K
• 年卷期：v.118,no.17(May 1, 2014)
• ISSN：1932-7455

文摘

Self-powered active gas sensing has been realized from core鈥搒hell In₂O₃/ZnO nanoarray nanogenerator, and extremely high H₂S sensitivity and selectivity at room temperature have been obtained. In₂O₃/ZnO nanoarrays have two functions: one is an energy source because In₂O₃/ZnO nanoarrays can produce piezoelectric output power; the other is a H₂S sensor because the piezoelectric output of In₂O₃/ZnO nanoarrays varies with the concentration of H₂S. Upon exposure to 700 ppm of H₂S at room temperature, the piezoelectric output of In₂O₃/ZnO nanoarrays decreases from 0.902 V (in air) to 0.088 V, and the sensitivity is up to 925, much higher than that of bare ZnO nanoarrays. The heterostructure conversion of In₂O₃/ZnO to In₂S₃/ZnO, in which the electron depletion layer on the surface of ZnO changes to the accumulation layer, has stronger adjustment on the free-carrier piezo-screening effect of ZnO than the gas adsorption. Our results demonstrate that a heterostructured nanoarray nanogenerator has potential applications in actively detecting toxic gas without using any external electricity power.