Gas Sensing Using Monolayer MoS2

In this chapter we explore the possibilities of using MoS2 for chemical gas sensing. We first introduce monolayer MoS2 and discuss the different reconstructed phases that can be produced in terms of their atomic and electronic structure. We show how these properties can vary drastically from their bulk counterparts, and how MoS2 can be taken as a useful model for other transition metal dichalcogenides (TMDs). We next explore different routes to tune the material properties through chemical functionalisation, before summarising the current literature on gas sensing using MoS2. We discuss the possibilities for Raman spectroscopy of MoS2 as a highly selective route to gas sensing, and the future possibilities for this as-yet largely unexplored application for this important family of monolayer TMDs.