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Open AccessArticle

Gas Sensors Based on Mechanically Exfoliated MoS2 Nanosheets for Room-Temperature NO2 Detection

1
School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China
2
Hunan Institute of Advanced Sensing and Information Technology, Xiangtan University, Xiangtan 411105, China
3
School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China
*
Authors to whom correspondence should be addressed.
Sensors 2019, 19(9), 2123; https://doi.org/10.3390/s19092123
Received: 8 April 2019 / Revised: 30 April 2019 / Accepted: 6 May 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Gas Sensors and Smart Sensing Systems)
The unique properties of MoS2 nanosheets make them a promising candidate for high-performance room temperature gas detection. Herein, few-layer MoS2 nanosheets (FLMN) prepared via mechanical exfoliation are coated on a substrate with interdigital electrodes for room-temperature NO2 detection. Interestingly, compared with other NO2 gas sensors based on MoS2, FLMN gas sensors exhibit high responsivity for room-temperature NO2 detection, and NO2 is easily desorbed from the sensor surface with an ultrafast recovery behavior, with recovery times around 2 s. The high responsivity is related to the fact that the adsorbed NO2 can affect the electron states within the entire material, which is attributed to the very small thickness of the MoS2 nanosheets. First-principles calculations were carried out based on the density functional theory (DFT) to verify that the ultrafast recovery behavior arises from the weak van der Waals binding between NO2 and the MoS2 surface. Our work suggests that FLMN prepared via mechanical exfoliation have a great potential for fabricating high-performance NO2 gas sensors. View Full-Text
Keywords: MoS2 nanosheets; gas sensors; NO2 sensors; mechanical exfoliation MoS2 nanosheets; gas sensors; NO2 sensors; mechanical exfoliation
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MDPI and ACS Style

Li, W.; Zhang, Y.; Long, X.; Cao, J.; Xin, X.; Guan, X.; Peng, J.; Zheng, X. Gas Sensors Based on Mechanically Exfoliated MoS2 Nanosheets for Room-Temperature NO2 Detection. Sensors 2019, 19, 2123. https://doi.org/10.3390/s19092123

AMA Style

Li W, Zhang Y, Long X, Cao J, Xin X, Guan X, Peng J, Zheng X. Gas Sensors Based on Mechanically Exfoliated MoS2 Nanosheets for Room-Temperature NO2 Detection. Sensors. 2019; 19(9):2123. https://doi.org/10.3390/s19092123

Chicago/Turabian Style

Li, Wenli; Zhang, Yong; Long, Xia; Cao, Juexian; Xin, Xin; Guan, Xiaoxiao; Peng, Jinfeng; Zheng, Xuejun. 2019. "Gas Sensors Based on Mechanically Exfoliated MoS2 Nanosheets for Room-Temperature NO2 Detection" Sensors 19, no. 9: 2123. https://doi.org/10.3390/s19092123

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