Flexible and transparent gas molecule sensor integrated with sensing and heating graphene layers.
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 (≈14 s) and slow (≈95 s) response due to sp(2) -carbon bonding and disorders on graphene and the self-integrated graphene heater leads to the rapid recovery (≈11 s) of a 2 cm × 2 cm sized sensor with reproducible sensing cycles, including full recovery steps without significant signal degradation under exposure to NO2 gas.
Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI), 218 Gajeong-ro, Yuseong-gu, Daejeon, 305-700, Korea; Department of Advanced Device Technology, University of Science and Technology (UST), Daejeon, 305-333, Korea.
Hongkyw
H
Choi
Jin Sik
JS
Choi
Jin-Soo
JS
Kim
Jong-Ho
JH
Choe
Kwang Hyo
KH
Chung
Jin-Wook
JW
Shin
Jin Tae
JT
Kim
Doo-Hyeb
DH
Youn
Ki-Chul
KC
Kim
Jeong-Ik
JI
Lee
Sung-Yool
SY
Choi
Philip
P
Kim
Choon-Gi
CG
Choi
Young-Jun
YJ
Yu
flexiblility; gas sensors; graphene; heaters; transparency