期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 118, 期 17, 页码 9209-9216出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp500516t
关键词
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资金
- National Natural Science Foundation of China [51102041, 11104025]
- Fundamental Research Funds for the Central Universities [N120205001, N120405010]
- Program for New Century Excellent Talents in University [NCET-13-0112]
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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