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Issue 2, 2019, Issue in Progress
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Photo-enhanced gas sensing of SnS2 with nanoscale defects

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Abstract

Recently a SnS2 based NO2 gas sensor with a 30 ppb detection limit was demonstrated but this required high operation temperatures. Concurrently, SnS2 grown by chemical vapor deposition is known to naturally contain nanoscale defects, which could be exploited. Here, we significantly enhance the performance of a NO2 gas sensor based on SnS2 with nanoscale defects by photon illumination, and a detection limit of 2.5 ppb is achieved at room temperature. Using a classical Langmuir model and density functional theory simulations, we show S vacancies work as additional adsorption sites with fast adsorption times, higher adsorption energies, and an order of magnitude higher resistance change compared with pristine SnS2. More interestingly, when electron–hole pairs are excited by photon illumination, the average adsorption time first increases and then decreases with NO2 concentration, while the average desorption time always decreases with NO2 concentration. Our results give a deep understanding of photo-enhanced gas sensing of SnS2 with nanoscale defects, and thus open an interesting window for the design of high performance gas sensing devices based on 2D materials.

Graphical abstract: Photo-enhanced gas sensing of SnS2 with nanoscale defects

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Supplementary files

Article information


Submitted
25 Oct 2018
Accepted
20 Dec 2018
First published
02 Jan 2019

This article is Open Access

RSC Adv., 2019,9, 626-635
Article type
Paper

Photo-enhanced gas sensing of SnS2 with nanoscale defects

W. Yan, D. Chen, H. Fuh, Y. Li, D. Zhang, H. Liu, G. Wu, L. Zhang, X. Ren, J. Cho, M. Choi, B. S. Chun, C. Ó. Coileáin, H. Xu, Z. Wang, Z. Jiang, C. Chang and H. Wu, RSC Adv., 2019, 9, 626
DOI: 10.1039/C8RA08857H

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    [Original citation] - Published by The Royal Society of Chemistry.

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