期刊
NANOTECHNOLOGY
卷 30, 期 35, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/ab2277
关键词
molybdenum disulfide; nitrogen dioxide sensor; UV-LED illumination; recovery; room temperature gas sensor
资金
- National Research Foundation of Korea(NRF) - Korea government (MSIT) [NRF-2018R1A2A1A05023070]
- Ministry of Trade, Industry & Energy (MOTIE, Korea) [10070075]
Two-dimensional (2D) nanomaterials have been extensively explored as promising candidates for gas sensing due to their high surface-to-volume ratio. Among many 2D nanomaterials, molybdenum disulfide (MoS2) is known to be functional in detecting harmful gases at room temperature; therefore, it has been actively studied as a gas sensing material. However, there has been a limitation in recovering the original signal from reacted MoS2 after exposure to the target gas. This work demonstrates the recovery of the initial resistance of reacted chemical vapor deposition-grown MoS2 by illuminating it with a UV light-emitting diode (LED). A novel mechanism involving photo-generated electron-hole pairs in MoS2 is proposed and experimentally verified. The fabricated sensor detects nitrogen dioxide (NO2) and distinguishes between concentrations from 1 to 10 ppm with the proposed recovery process. Reversible detection after repeated exposure to 5 ppm NO2 over eight cycles is achieved through UV-LED illumination for a short time during the recovery process, while the identical sensor without UV illumination shows a transitional response at each cycle. To apply a low cost gas sensing solution at room temperature, visible light LEDs are also used to recover the resistance of the reacted MoS2.
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