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A Gas Sensing Channel Composited with Pristine and Oxygen Plasma-Treated Graphene.


ABSTRACT: Oxygen plasma treatment has been reported as an effective way of improving the response of graphene gas sensors. In this work, a gas sensor based on a composite graphene channel with a layer of pristine graphene (G) at the bottom and an oxygen plasma-treated graphene (OP-G) as a covering layer was reported. The OP-G on top provided oxygen functional groups and serves as the gas molecule grippers, while the as-grown graphene beneath serves as a fast carrier transport path. Thus, the composite channel (OP-G/G) demonstrated significantly improved response in NH? gas sensing tests compared with the pristine G channel. Moreover, the OP-G/G channel showed faster response and recovering process than the OP-G channel. Since this kind of composite channel is fabricated from chemical vapor deposited graphene and patterned with standard photolithography, the device dimension was much smaller than a gas sensor fabricated from reduced graphene oxide and it is favorable for the integration of a large number of sensing units.

SUBMITTER: Wu H 

PROVIDER: S-EPMC6387050 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature

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A Gas Sensing Channel Composited with Pristine and Oxygen Plasma-Treated Graphene.

Wu Haiyang H   Bu Xiangrui X   Deng Minming M   Chen Guangbing G   Zhang Guohe G   Li Xin X   Wang Xiaoli X   Liu Weihua W  

Sensors (Basel, Switzerland) 20190201 3


Oxygen plasma treatment has been reported as an effective way of improving the response of graphene gas sensors. In this work, a gas sensor based on a composite graphene channel with a layer of pristine graphene (G) at the bottom and an oxygen plasma-treated graphene (OP-G) as a covering layer was reported. The OP-G on top provided oxygen functional groups and serves as the gas molecule grippers, while the as-grown graphene beneath serves as a fast carrier transport path. Thus, the composite cha  ...[more]

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