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Open AccessArticle

Significant Enhancement of Hydrogen-Sensing Properties of ZnO Nanofibers through NiO Loading

1
Department of Materials Science and Engineering, Inha University, Incheon 402-751, Korea
2
The Research Institute of Industrial Science, Hanyang University, Seoul 133-791, Korea
3
Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz 7155713876, Iran
4
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
*
Authors to whom correspondence should be addressed.
Nanomaterials 2018, 8(11), 902; https://doi.org/10.3390/nano8110902
Received: 18 October 2018 / Revised: 1 November 2018 / Accepted: 2 November 2018 / Published: 3 November 2018
(This article belongs to the Special Issue Development of Semiconductor Nanomaterials for Gas Sensors)
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. View Full-Text
Keywords: ZnO; NiO loading; p-n heterojunction; nanofiber; gas sensor; sensing mechanism ZnO; NiO loading; p-n heterojunction; nanofiber; gas sensor; sensing mechanism
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MDPI and ACS Style

Lee, J.-H.; Kim, J.-Y.; Mirzaei, A.; Kim, H.W.; Kim, S.S. Significant Enhancement of Hydrogen-Sensing Properties of ZnO Nanofibers through NiO Loading. Nanomaterials 2018, 8, 902.

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