Charge-transfer-based Gas Sensing Using Atomic-layer MoS2
Open Access
- 27 January 2015
- journal article
- research article
- Published by Springer Science and Business Media LLC in Scientific Reports
- Vol. 5 (1), srep08052
- https://doi.org/10.1038/srep08052
Abstract
Two-dimensional (2D) molybdenum disulphide (MoS2) atomic layers have a strong potential to be used as 2D electronic sensor components. However, intrinsic synthesis challenges have made this task difficult. In addition, the detection mechanisms for gas molecules are not fully understood. Here, we report a high-performance gas sensor constructed using atomic-layered MoS2 synthesised by chemical vapour deposition (CVD). A highly sensitive and selective gas sensor based on the CVD-synthesised MoS2 was developed. In situ photoluminescence characterisation revealed the charge transfer mechanism between the gas molecules and MoS2, which was validated by theoretical calculations. First-principles density functional theory calculations indicated that NO2 and NH3 molecules have negative adsorption energies (i.e., the adsorption processes are exothermic). Thus, NO2 and NH3 molecules are likely to adsorb onto the surface of the MoS2. The in situ PL characterisation of the changes in the peaks corresponding to charged trions and neutral excitons via gas adsorption processes was used to elucidate the mechanisms of charge transfer between the MoS2 and the gas molecules.Keywords
This publication has 35 references indexed in Scilit:
- Layer-by-Layer Thinning of MoS2 by PlasmaACS Nano, 2013
- Electrical control of neutral and charged excitons in a monolayer semiconductorNature Communications, 2013
- Tightly bound trions in monolayer MoS2Nature Materials, 2012
- Growth of Large-Area and Highly Crystalline MoS2 Thin Layers on Insulating SubstratesNano Letters, 2012
- High Sensitivity Gas Detection Using a Macroscopic Three-Dimensional Graphene Foam NetworkScientific Reports, 2011
- Metal Oxide Semi-Conductor Gas Sensors in Environmental MonitoringSensors, 2010
- Recent advances in wide bandgap semiconductor biological and gas sensorsProgress in Materials Science, 2010
- Gas Sensors Based on Semiconducting Metal Oxide One-Dimensional NanostructuresSensors, 2009
- Detection of individual gas molecules adsorbed on grapheneNature Materials, 2007
- Nanotube Molecular Wires as Chemical SensorsScience, 2000