Abstract
Transition metal dichalcogenides (TMDs) have recently sparked interest in gas-sensing applications. Generally, the kinetics of gases show minimal reactivity when the sensor is operable at room temperature (RT). Photon excitation is a potential solution for enhancing gas kinetics at RT. The present study delves gas sensing properties of MoS2/WSe2 heterostructure, emphasizing its effectiveness in detecting a broad range of NO concentration (0.1 ppm to 10 ppm) at room temperature using UV-light (266 nm & 355 nm) as a catalyst. The results reveal a remarkable 13x & 5x amplification in NO detection at 10 ppm for MoS2/WSe2 heterostructure compared to pristine WSe2 and MoS2, which were primarily tested. The highest relative sensor response of 95.4 % is reported for 10 ppm of NO gas at RT under 266 nm illumination. The sensing results revealed a substantial reduction in the limit of detection (LOD) to around 16 ppb, followed by a swift response speed of 10.31/14.38 seconds. The synergistic combination of WSe2 and MoS2 and their high specific surface area enhance NO sensitivity under UV exposure. The fabricated device holds substantial importance in environmental monitoring and healthcare, paving the way for real-time data acquisition in gas sensing.
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