Operando Investigation of WS₂ Gas Sensors: Simultaneous Ambient Pressure X-ray Photoelectron Spectroscopy and Electrical Characterization in Unveiling Sensing Mechanisms during Toxic Gas Exposure.

ABSTRACT: Ambient pressure X-ray photoelectron spectroscopy (APXPS) is combined with simultaneous electrical measurements and supported by density functional theory calculations to investigate the sensing mechanism of tungsten disulfide (WS₂)-based gas sensors in an operando dynamic experiment. This approach allows for the direct correlation between changes in the surface potential and the resistivity of the WS₂ sensing active layer under realistic operating conditions. Focusing on the toxic gases NO₂ and NH₃, we concurrently demonstrate the distinct chemical interactions between oxidizing or reducing agents and the WS₂ active layer and their effect on the sensor response. The experimental setup mimics standard electrical measurements on

SUBMITTER: Scardamaglia M 

PROVIDER: S-EPMC11348423 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature