Metal Oxide Based Heterojunctions for Gas Sensors: A Review

Overview

Journal Nanomaterials (Basel)

Date 2021 Apr 30

PMID 33920589

Citations 11

Authors

Shulin Yang

Gui Lei

Huoxi Xu

Zhigao Lan

Zhao Wang

Haoshuang Gu

Affiliations

Soon will be listed here.

Abstract

The construction of heterojunctions has been widely applied to improve the gas sensing performance of composites composed of nanostructured metal oxides. This review summarises the recent progress on assembly methods and gas sensing behaviours of sensors based on nanostructured metal oxide heterojunctions. Various methods, including the hydrothermal method, electrospinning and chemical vapour deposition, have been successfully employed to establish metal oxide heterojunctions in the sensing materials. The sensors composed with the built nanostructured heterojunctions were found to show enhanced gas sensing performance with higher sensor responses and shorter response times to the targeted reducing or oxidising gases compare with those of the pure metal oxides. Moreover, the enhanced gas sensing mechanisms of the metal oxide-based heterojunctions to the reducing or oxidising gases are also discussed, with the main emphasis on the important role of the potential barrier on the accumulation layer.

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