The evaluation of photo-activated gas response of monolayer MoS₂

Abstract

Monolayer MoS₂ is a promising material for gas sensing due to its large surface-volume ratio. However, its slow response / recovery in room temperature prevents practical sensor applications. Recently, we found that the gas response of the monolayer MoS₂ is activated under light illumination. In this study, we show that the response and recovery rates linearly increase with light intensity. This result can be explained by Langmuir adsorption model in consideration of photo-stimulated gas desorption.