Mechanically exfoliated MoS2 nanosheets decorated with SnS2 nanoparticles for high-stability gas sensors at room temperature
Due to its unique physical, chemical and surface electronic properties, molybdenum disulfide (MoS 2 ) nanosheets open up a new avenue for nitrogen dioxide (NO 2 ) detection at room temperature. Nevertheless, the gas sensing properties of pure MoS 2 nanosheets are inevitably degenerated by the adsorp...
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Published in | Rare metals Vol. 40; no. 6; pp. 1536 - 1544 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Beijing
Nonferrous Metals Society of China
01.06.2021
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Due to its unique physical, chemical and surface electronic properties, molybdenum disulfide (MoS
2
) nanosheets open up a new avenue for nitrogen dioxide (NO
2
) detection at room temperature. Nevertheless, the gas sensing properties of pure MoS
2
nanosheets are inevitably degenerated by the adsorption of atmospheric oxygen, which results in weak stability for MoS
2
-based gas sensors. Reducing surface defects and constructing heterojunctions may be effective strategies to improve the gas sensing properties of MoS
2
nanosheets. In this work, we design a novel nanocomposite based on MoS
2
nanosheets decorated with tin disulfide (SnS
2
) nanoparticles (MoS
2
/SnS
2
) via combining the mechanical exfoliation method with the facile hydrothermal method. The experimental results indicate that, after surfaces decoration with SnS
2
nanoparticles, the as-prepared gas sensor based on MoS
2
/SnS
2
nanocomposites exhibits reliable long-term stability with the maximum response value drift of less than 3% at room temperature. Moreover, the MoS
2
/SnS
2
sensor also possesses desirable gas sensing properties upon NO
2
at room temperature, such as high sensitivity, rapid response/recovery speed (28 s/3 s, 5 × 10
−6
NO
2
), satisfactory selectivity, favorable repeatability and reversibility. The improved gas sensing properties of MoS
2
/SnS
2
nanocomposites can be attributed to the unique electronic properties of MoS
2
nanosheets with the fewer layers structure and the competitive adsorption effect of SnS
2
nanoparticles. This work elucidates that SnS
2
nanoparticles serving as an effective antioxidative decoration can promote the stability of MoS
2
nanosheets, providing a promising approach to achieve high-stability NO
2
gas sensors at room temperature. |
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ISSN: | 1001-0521 1867-7185 |
DOI: | 10.1007/s12598-020-01565-4 |