Issue 22, 2019

Extremely sensitive and accurate H2S sensor at room temperature fabricated with In-doped Co3O4 porous nanosheets

Abstract

A facile hydrothermal method to prepare In-doped Co3O4 porous nanosheets is reported in this paper for the first time. The prepared samples were made into gas sensors, and their sensing properties, such as response, response time, recovery time, selectivity and stability, have been researched systematically. These results indicate that the sensor fabricated with 1.0 at% In-doped Co3O4 porous nanosheets shows a high response of 6.81 to 50 ppm and an obvious response of 1.4 to 1 ppm H2S. What's more, this sensor exhibited a high selectivity and outstanding long-term stability toward H2S. The excellent gas sensing performance was mainly ascribed to two reasons. (i) Doping with In increases the concentration of charge carriers, oxygen-deficient regions and the chemisorbed oxygen, which enhances the gas response. (ii) The rough porous structure is conducive to gas adsorption and capture, and provides many active sites for the sensing reaction. Therefore, 1.0 at% In-doped Co3O4 porous nanosheets could be used as a sensing material in future applications.

Graphical abstract: Extremely sensitive and accurate H2S sensor at room temperature fabricated with In-doped Co3O4 porous nanosheets

Supplementary files

Article information

Article type
Paper
Submitted
09 Mar 2019
Accepted
24 Apr 2019
First published
24 Apr 2019

Dalton Trans., 2019,48, 7720-7727

Extremely sensitive and accurate H2S sensor at room temperature fabricated with In-doped Co3O4 porous nanosheets

J. Wu, Y. Yang, C. Zhang, H. Yu, L. Huang, X. Dong, J. Wang and X. Wang, Dalton Trans., 2019, 48, 7720 DOI: 10.1039/C9DT01043B

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