Mechanically exfoliated MoS 2 nanosheets decorated with SnS 2 nanoparticles for high-stability gas sensors at room tempe
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Mechanically exfoliated MoS2 nanosheets decorated with SnS2 nanoparticles for high-stability gas sensors at room temperature Jia-Bei Liu, Jin-Yong Hu*
, Can Liu, Yu-Ming Tan, Xiang Peng, Yong Zhang*
Received: 3 June 2020 / Revised: 25 July 2020 / Accepted: 4 August 2020 Ó The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Due to its unique physical, chemical and surface electronic properties, molybdenum disulfide (MoS2) nanosheets open up a new avenue for nitrogen dioxide (NO2) detection at room temperature. Nevertheless, the gas sensing properties of pure MoS2 nanosheets are inevitably degenerated by the adsorption of atmospheric oxygen, which results in weak stability for MoS2-based gas sensors. Reducing surface defects and constructing heterojunctions may be effective strategies to improve the gas sensing properties of MoS2 nanosheets. In this work, we design a novel nanocomposite based on MoS2 nanosheets decorated with tin disulfide (SnS2) nanoparticles (MoS2/SnS2) via combining the mechanical exfoliation method with the facile hydrothermal method. The experimental results indicate that, after surfaces decoration with SnS2 nanoparticles, the as-prepared gas sensor based on MoS2/ SnS2 nanocomposites exhibits reliable long-term stability with the maximum response value drift of less than 3% at room temperature. Moreover, the MoS2/SnS2 sensor also possesses desirable gas sensing properties upon NO2 at room temperature, such as high sensitivity, rapid response/ recovery speed (28 s/3 s, 5 9 10-6 NO2), satisfactory selectivity, favorable repeatability and reversibility. The improved gas sensing properties of MoS2/SnS2 nanocomposites can be attributed to the unique electronic properties J.-B. Liu, J.-Y. Hu*, C. Liu, Y.-M. Tan, X. Peng, Y. Zhang* School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China e-mail: [email protected] Y. Zhang e-mail: [email protected] Y. Zhang Hunan Institute of Advanced Sensing and Information Technology, Xiangtan University, Xiangtan 411105, China
of MoS2 nanosheets with the fewer layers structure and the competitive adsorption effect of SnS2 nanoparticles. This work elucidates that SnS2 nanoparticles serving as an effective antioxidative decoration can promote the stability of MoS2 nanosheets, providing a promising approach to achieve high-stability NO2 gas sensors at room temperature. Keywords Mechanically exfoliated MoS2 nanosheets; MoS2/SnS2 nanocomposites; NO2 sensing properties; Room-temperature detection
1 Introduction Nitrogen dioxide (NO2), as one of the most common and dangerous toxic gases [1–3], mainly originates from the combustion of organic fuels and the exhaust emission of automobiles, which can cause serious environmental pollution and threaten human respiratory system [4, 5]. The National Institute of Occupational Safety and Health (NIOSH) proposes that the exposure limit of NO2 gas is 20 9 10-6 since it is immediately damage to life or health [6
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