The ultra-high NO^sub 2^ response of ultra-thin WS^sub 2^ nanosheets synthesized by hydrothermal and calcination processes

Ultra-thin WS2 nanosheets with a thickness of about 5 nm were synthesized by an economical hydrothermal method and the following calcination process. A three dimensional wall-like structure was formed by the interconnecting WS2 nanosheets. The growth mechanism of as-prepared WS2 nanosheets was discu...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2018-04, Vol.259, p.789
Main Authors: Xu, Tingting, Liu, Yunyun, Pei, Yongyong, Chen, Yunpeng, Jiang, Zimin, Shi, Zhifeng, Xu, Junmin, Wu, Di, Tian, Yongtao, Li, Xinjian
Format: Article
Language:English
Subjects:
Aqueous solutions
Gas sensors
Heating
High temperature
Nanosheets
Nanostructure
Nanostructured materials
Nitrogen dioxide
Roasting
Synthesis
Thickness
Tungsten disulfide
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Summary:Ultra-thin WS2 nanosheets with a thickness of about 5 nm were synthesized by an economical hydrothermal method and the following calcination process. A three dimensional wall-like structure was formed by the interconnecting WS2 nanosheets. The growth mechanism of as-prepared WS2 nanosheets was discussed, and it was deduced that mesolamellar tungsten sulfide (WS-L) with intercalated CTA+ cations was formed by co-condensation reaction of WS42− and CTAB in the hydrothermal process. The resistive gas sensors based on as-prepared WS2 nanosheets showed a p-type character, achieved a superior response of 9.3% to 0.1 ppm NO2 gas at room temperature (25 °C) and a good stability in low and moderate humidity. The excellent NO2 sensing properties can be attributed to the ultra-thin nanostructure of the WS2 nanosheets.
ISSN:0925-4005
1873-3077