Enhanced sensing of gas molecules by a 99.9% semiconducting carbon nanotube-based field-effect transistor sensor

Carbon nanotubes (CNTs) have been regarded as a promising material for highly sensitive gas sensors due to their excellent material properties combined with their one-dimensional structural advantages, i.e., a high surface-to-volume ratio. Here we demonstrate a CNT-based gas sensor based on assembling highly purified, solution-processed 99.9% semiconducting CNT networks bridged by palladium source/drain electrodes in a field-effect transistor (FET) configuration with a local back-gate electrode. We investigated the gas responses of the CNT-FETs under different controlled operating regimes for the enhanced detection of H-2 and NO2 gases using sensors with various physical dimensions. With the aid of the CNTs with high semiconducting purity (99.9%), we achieved excellent electrical properties and gas responses in the sensors and clearly determined that the operating regimes and physical dimensions of the sensors should be appropriately adjusted for enhanced sensing performance, depending on the gas molecules to be detected. Published by AIP Publishing.
Publisher
AMER INST PHYSICS
Issue Date
2017-07
Language
English
Keywords

HYDROGEN SENSORS; CHEMICAL SENSORS; PERFORMANCE; CONTACT; FILMS; TRANSPARENT; ELECTRONICS; MECHANISM; METAL

Citation

APPLIED PHYSICS LETTERS, v.111, no.2

ISSN
0003-6951
DOI
10.1063/1.4991970
URI
http://hdl.handle.net/10203/225334
Appears in Collection
ME-Journal Papers(저널논문)
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