Issue 16, 2016

Ultrasensitive reversible oxygen sensing by using liquid-exfoliated MoS2 nanoparticles

Abstract

Two-dimensional (2D) molybdenum disulfide (MoS2) has been attracting rapidly increasing interest for application in chemoresistive gas sensors owing to its moderate band gap energy and high specific surface area. However, the mechanism of chemoresistive sensing via the adsorption and desorption of gas molecules and the influence of the shape of 2D materials are not well understood yet. Herein we investigate the oxygen sensing behavior of MoS2 microflakes and nanoparticles prepared by mechanical and liquid exfoliation, respectively. Liquid-exfoliated MoS2 nanoparticles with an increased number of edge sites present high and linear responses to a broad range of oxygen concentrations (1–100%). The energetically favorable oxygen adsorption sites, which are responsible for reversible oxygen sensing, are identified by first-principles calculations based on density functional theory. This study serves as a proof-of-concept for the gas sensing mechanism depending on the surface configuration of 2D materials and broadens the potential of 2D MoS2 in gas sensing applications.

Graphical abstract: Ultrasensitive reversible oxygen sensing by using liquid-exfoliated MoS2 nanoparticles

Supplementary files

Article information

Article type
Paper
Submitted
11 Feb 2016
Accepted
20 Mar 2016
First published
21 Mar 2016

J. Mater. Chem. A, 2016,4, 6070-6076

Ultrasensitive reversible oxygen sensing by using liquid-exfoliated MoS2 nanoparticles

Y. H. Kim, K. Y. Kim, Y. R. Choi, Y. Shim, J. Jeon, J. Lee, S. Y. Kim, S. Han and H. W. Jang, J. Mater. Chem. A, 2016, 4, 6070 DOI: 10.1039/C6TA01277A

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