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

Authors

  • Hongkyw Choi,

    1. Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI), Yuseong-gu, Daejeon, Korea
    2. Department of Advanced Device Technology, University of Science and Technology (UST), Daejeon, Korea
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  • Jin Sik Choi,

    1. Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI), Yuseong-gu, Daejeon, Korea
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  • Jin-Soo Kim,

    1. Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI), Yuseong-gu, Daejeon, Korea
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  • Jong-Ho Choe,

    1. Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI), Yuseong-gu, Daejeon, Korea
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  • Kwang Hyo Chung,

    1. Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI), Yuseong-gu, Daejeon, Korea
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  • Jin-Wook Shin,

    1. OLED Research Center, Electronics and Telecommunications Research Institute (ETRI), Yuseong-gu, Daejeon, Korea
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  • Jin Tae Kim,

    1. Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI), Yuseong-gu, Daejeon, Korea
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  • Doo-Hyeb Youn,

    1. Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI), Yuseong-gu, Daejeon, Korea
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  • Ki-Chul Kim,

    1. Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI), Yuseong-gu, Daejeon, Korea
    2. Department of Advanced Chemical Engineering, Mokwon University, Daejeon, Korea
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  • Jeong-Ik Lee,

    1. OLED Research Center, Electronics and Telecommunications Research Institute (ETRI), Yuseong-gu, Daejeon, Korea
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  • Sung-Yool Choi,

    1. Department of Electrical Engineering and Graphene Research Center, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea
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  • Philip Kim,

    1. Department of Physics, Columbia University, New York, NY, USA
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  • Choon-Gi Choi,

    Corresponding author
    1. Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI), Yuseong-gu, Daejeon, Korea
    2. Department of Advanced Device Technology, University of Science and Technology (UST), Daejeon, Korea
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  • Young-Jun Yu

    Corresponding author
    1. Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI), Yuseong-gu, Daejeon, Korea
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Abstract

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 sp2-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.

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