Preprint Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 20 August 2018 / Approved: 20 August 2018 / Online: 20 August 2018 (12:26:21 CEST)

How to cite: Lee, J.; Kim, J.; Mirzaei, A.; Kim, H.W.; Kim, S.S. Significant Enhancement of Hydrogen-Sensing Properties of ZnO Nanofibers through NiO Loading. Preprints 2018, 2018080354 (doi: 10.20944/preprints201808.0354.v1). Lee, J.; Kim, J.; Mirzaei, A.; Kim, H.W.; Kim, S.S. Significant Enhancement of Hydrogen-Sensing Properties of ZnO Nanofibers through NiO Loading. Preprints 2018, 2018080354 (doi: 10.20944/preprints201808.0354.v1).

Abstract

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, and 0.1 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.

Subject Areas

ZnO; NiO loading; p-n heterojunction; nanofiber; gas sensor; sensing mechanism

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