Issue 19, 2022

Bi2S3/ZnS heterostructures for H2S sensing in the dark: the synergy of increased surface-adsorbed oxygen and charge transfer

Abstract

Bismuth sulfide (Bi2S3) is a promising sensing material owing to its unique properties like a narrow bandgap, a large number of surface-adsorption sites, and excellent electrical properties. However, the unsatisfactory sensitivity precludes its application in high-performance sensors to detect H2S. Herein, a Bi2S3/ZnS heterostructure was constructed as a sensing material to further improve its sensitivity toward H2S by modulating light or dark conditions. The sensor based on the Bi2S3/ZnS heterostructure exhibited an ultrahigh response (1027%) when exposed to 500 ppb H2S in the dark, roughly 4 times higher than that of pristine Bi2S3 under indoor light. Besides, pristine ZnS has almost no H2S sensing response. Such a distinctive enhancement is mainly attributed to the effective separation of electron–hole pairs and charge transfer by the heterostructures, as well as more surface-adsorbed oxygen under dark conditions, which is conducive to H2S sensing. Moreover, the Bi2S3/ZnS-based sensor has excellent selectivity, repeatability, long-term stability, and humidity tolerance, which lays a good foundation for its practical production and application in dark and humid environments, such as tunnels.

Graphical abstract: Bi2S3/ZnS heterostructures for H2S sensing in the dark: the synergy of increased surface-adsorbed oxygen and charge transfer

Supplementary files

Article information

Article type
Research Article
Submitted
27 jun 2022
Accepted
05 aug 2022
First published
09 aug 2022

Inorg. Chem. Front., 2022,9, 4921-4929

Bi2S3/ZnS heterostructures for H2S sensing in the dark: the synergy of increased surface-adsorbed oxygen and charge transfer

J. Liu, T. Xin, Z. Yang, W. Hao, Y. Wang and J. Hao, Inorg. Chem. Front., 2022, 9, 4921 DOI: 10.1039/D2QI01378A

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