期刊
NANOMATERIALS
卷 8, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/nano8110902
关键词
ZnO; NiO loading; p-n heterojunction; nanofiber; gas sensor; sensing mechanism
类别
资金
- International Research and Development Program of the National Research Foundation of Korea (NRF) - Ministry of Science and ICT of Korea [NRF-2017K1A3A1A49070046]
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 degrees 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 H-2 sensors through the optimization of p-type metal oxide loading on the surfaces of n-type metal oxides.
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