Abstract
We have investigated the effects of metal decoration on the gas-sensing properties of a device with two-dimensional (2D) molybdenum disulfide (MoS2) flake channels and graphene electrodes. The 2D hybrid-structure device sensitively detected NO2 gas molecules (>1.2 ppm) as well as NH3 (>10 ppm). Metal nanoparticles (NPs) could tune the electronic properties of the 2D graphene/MoS2 device, increasing sensitivity to a specific gas molecule. For instance, palladium NPs accumulate hole carriers of graphene/MoS2, electronically sensitizing NH3 gas molecules. Contrarily, aluminum NPs deplete hole carriers, enhancing NO2 sensitivity. The synergistic combination of metal NPs and 2D hybrid layers could be also applied to a flexible gas sensor. There was no serious degradation in the sensing performance of metal-decorated MoS2 flexible devices before/after 5000 bending cycles. Thus, highly sensitive and endurable gas sensor could be achieved through the metal-decorated 2D hybrid-structure, offering a useful route to wearable electronic sensing platforms.
Highlights
Two-dimensional (2D) graphene has evoked considerable interest in diverse potential applications [1,2,3,4,5]. 2D graphene has been developed for a long time and primarily employed as a transparent conductor for electronic applications [6] and it is in the middle of vital advances toward practical applications [7]
Fabrication of Gas-Sensing Devices Consisting of MoS2 Channels and Graphene Electrodes
Interdigitated electrode array structure was selected for higher device yield by increasing a probability that MoS2 flakes bridge two graphene electrode lines
Summary
Two-dimensional (2D) graphene has evoked considerable interest in diverse potential applications [1,2,3,4,5]. 2D graphene has been developed for a long time and primarily employed as a transparent conductor for electronic applications [6] and it is in the middle of vital advances toward practical applications [7]. We report on the effect of metal-decoration on the gas-sensing properties of 2D hybrid-structures consisting of molybdenum disulfide (MoS2) flakes and graphene electrodes. The device showed an obviously higher response to NO2 gas molecules (>1.2 ppm) as well as NH3. It was found that metal nanoparticles (NPs) increase the selectivity for a certain gas molecule. Palladium NPs enhanced the response to NH3 gas molecule with respect to NO2. The synergistic combination of metal NPs and the 2D hybrid layers could be employed to form Pd:MoS2 flexible devices, showing no serious change in sensing performance even after 5000 bending cycles. Metal-decorated 2D hybrid-structures could enable highly sensitive and endurable gas sensors for wearable electronic sensing platforms
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