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Detection of sulfur dioxide gas with graphene field effect transistor

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9 Author(s)
Ren, Yujie ; School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China ; Zhu, Chaofu ; Cai, Weiwei ; Li, Huifeng
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Graphene grown by chemical vapor deposition on a Cu foil and transferred onto a Si wafer has been used to fabricate a field effect transistor device that was used to study the sensing of SO2 gas. It was found by in-situ measurements that the SO2 strongly p-dopes the graphene and dramatically shifts its Dirac point. This effect was used to monitor the SO2 gas. The detector can be completely reset by thermal annealing at 100 °C in high vacuum. The response and recovery of the detector are faster at higher temperatures. Moreover, the sensitivity of the SO2 graphene detector increases proportionally with increasing temperature.

Published in:

Applied Physics Letters  (Volume:100 ,  Issue: 16 )

Date of Publication:

Apr 2012

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