Significant Enhancement of Hydrogen-Sensing Properties of ZnO Nanofibers through NiO Loading.
Significant Enhancement of Hydrogen-Sensing Properties of ZnO Nanofibers through NiO Loading.
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DOI:
10.3390/nano8110902
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发表时间:
2018-11-03
期刊:
影响因子:
--
通讯作者:
Kim SS
中科院分区:
文献类型:
--
作者:
Lee JH;Kim JY;Mirzaei A;Kim HW;Kim SS
Metal oxide p-n heterojunction nanofibers (NFs) are among the most promising approaches to enhancing the efficiency of gas sensors. In this paper, we report the preparation of a series of p-NiO-loaded n-ZnO NFs, namely (1−x)ZnO-xNiO (x = 0.03, 0.05, 0.7, 0.1, and 0.15 wt%), for hydrogen gas sensing experiments. Samples were prepared through the electrospinning technique followed by a calcination process. The sensing experiments showed that the sample with 0.05 wt% NiO loading resulted in the highest sensing performance at an optimal sensing temperature of 200 °C. The sensing mechanism is discussed in detail and contributions of the p-n heterojunctions, metallization of ZnO and catalytic effect of NiO on the sensing enhancements of an optimized gas sensor are analyzed. This study demonstrates the possibility of fabricating high-performance H2 sensors through the optimization of p-type metal oxide loading on the surfaces of n-type metal oxides.
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