Flexible and Transparent Gas Molecule Sensor Integrated with Sensing and Heating Graphene Layers

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Graphene leading to high surface-to-volume ratio and outstanding conductivity is applied for gas molecule sensing with fully utilizing its unique transparent and flexible functionalities which cannot be expected from solid-state gas sensors. In order to attain a fast response and rapid recovering time, the flexible sensors also require integrated flexible and transparent heaters. Here, large-scale flexible and transparent gas molecule sensor devices, integrated with a graphene sensing channel and a graphene transparent heater for fast recovering operation, are demonstrated. This combined all-graphene device structure enables an overall device optical transmittance that exceeds 90% and reliable sensing performance with a bending strain of less than 1.4%. In particular, it is possible to classify the fast (approximate to 14 s) and slow (approximate to 95 s) response due to sp(2)-carbon bonding and disorders on graphene and the self-integrated graphene heater leads to the rapid recovery (approximate to 11 s) of a 2 cm x 2 cm sized sensor with reproducible sensing cycles, including full recovery steps without significant signal degradation under exposure to NO2 gas.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2014-09
Language
English
Article Type
Article
Citation

SMALL, v.10, no.18, pp.3685 - 3691

ISSN
1613-6810
DOI
10.1002/smll.201400434
URI
http://hdl.handle.net/10203/192933
Appears in Collection
EE-Journal Papers(저널논문)
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