Abstract
The development of high-performance gas sensors operating at room temperature based on transition metal dichalcogenide (TMD) remains a challenge. Herein, we demonstrated a novel visible-light photocatalysis-enhanced gas sensor based on MoS2/rGO hybrid, enabling high-performance detection of formaldehyde at room temperature. By introducing visible-light illumination, the sensor response to 10 ppm HCHO was increased by over 8 times, and the response time sharply decreased from 79 s to 17 s. The sensor also had advantages of low detection limit, excellent reversibility and long-term stability. The visible-light induced oxygen activation and formaldehyde oxidation over the MoS2 photocatalysts were investigated by X-ray photoelectron spectrometer (XPS), O2 temperature programmed desorption analysis (O2-TPD) and in-situ Fourier transform infrared spectroscopy (in-situ IR). The enhanced room-temperature HCHO sensing by the MoS2/rGO hybrid was connected with the visible-light photocatalytic activity of MoS2 as well as the efficient charge separation rendered by rGO. As a proof-of-concept, the photocatalytic gas sensing approach described here should be a promising strategy for developing room-temperature-operated, high-performance gas sensors based on TMD and other novel semiconductors.
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