Graphene Decorated With Mo3S7 Clusters for Sensing CO2

Abstract

This paper reports for the first time a gas-sensitive nanohybrid based on trinuclear molybdenum sulfido clusters ((Bu4N)2[Mo3(μ3-S)(μ-S2)3Cl6] (Mo3S7)) supported on graphene flakes (Mo3S7@Graphene). The nanomaterial, once implemented in a chemoresistive device, changes its electrical resistivity when exposed, at room temperature (RT), to toxic and harmful gases, such as hydrogen (H2), carbon dioxide (CO2), carbon monoxide (CO), and benzene. Particularly, the Mo3S7@Graphene hybrid shows an outstanding sensing performance toward CO2. Theoretical calculations provide a better understanding of the plausible gas sensing mechanisms. These findings open the door for a new generation of molybdenum sulfido cluster-based sensors in which electronic interrogation can be implemented, advancing toward the realization of highly sensitive gas sensing.