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- Title
Metal Decoration Effects on the Gas-Sensing Properties of 2D Hybrid-Structures on Flexible Substrates.
- Authors
Byungjin Cho; Jongwon Yoon; Sung Kwan Lim; Ah Ra Kim; Sun-Young Choi; Dong-Ho Kim; Kyu Hwan Lee; Byoung Hun Lee; Heung Cho Ko; Myung Gwan Hahm
- 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.
- Subjects
METALS; FLEXIBLE structures; GRAPHENE; ELECTRODES; WEARABLE technology
- Publication
Sensors (14248220), 2015, Vol 15, Issue 10, p24903
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s151024903