4.6 Article

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

Journal

JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 17, Pages 9209-9216

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/jp500516t

Keywords

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Funding

  1. National Natural Science Foundation of China [51102041, 11104025]
  2. Fundamental Research Funds for the Central Universities [N120205001, N120405010]
  3. Program for New Century Excellent Talents in University [NCET-13-0112]

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Self-powered active gas sensing has been realized from core shell 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 In2O3/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.

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