Resistance-based H2S gas sensors using metal oxide nanostructures: A review of recent advances

Ali Mirzaei; Sang Sub Kim; Hyoun Woo Kim

doi:10.1016/j.jhazmat.2018.06.015

Resistance-based H₂S gas sensors using metal oxide nanostructures: A review of recent advances

J Hazard Mater. 2018 Sep 5:357:314-331. doi: 10.1016/j.jhazmat.2018.06.015. Epub 2018 Jun 6.

Authors

Ali Mirzaei¹, Sang Sub Kim², Hyoun Woo Kim³

Affiliations

¹ The Research Institute of Industrial Science, Hanyang University, Seoul 133-791, Republic of Korea; Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz, Iran.
² Department of Materials Science and Engineering, Inha University, Incheon 402-751, Republic of Korea. Electronic address: sangsub@inha.ac.kr.
³ The Research Institute of Industrial Science, Hanyang University, Seoul 133-791, Republic of Korea; Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Republic of Korea. Electronic address: hyounwoo@hanyang.ac.kr.

PMID: 29902726
DOI: 10.1016/j.jhazmat.2018.06.015

Abstract

Gas sensors play an undeniable role in most fields of technology in the modern world; they are broadly used for public safety, pollution monitoring, quality control, breath analysis, smart homes and automobiles, and so on. Due to their low cost, high sensitivity, compact size, online detection, ease of use, portability, and low power consumption, metal oxide (MO) gas sensors have exceptional potential for detection of more than 150 gases. This paper reviews the current state-of-the-art H₂S conductometric MO gas sensors. In the first part, the H₂S sensing mechanism for MOs is presented in detail. In the next part, the H₂S sensing characteristics of the different MOs are presented, focusing on strategies such as metal doping, heterojunction composites, and different morphologies that are applied to enhance their sensing characteristics. In general, CuO, ZnO, and SnO₂ show the highest sensitivity to H₂S; therefore, most of this review is dedicated to these oxides. In the last part, some unusual and emerging MOs for H₂S sensing are presented.

Keywords: Gas sensor; H(2)S gas; Metal oxide; Nanostructure; Sensing mechanism.

Publication types

Review
Research Support, Non-U.S. Gov't