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Journal Article
Flexible and Transparent Gas Molecule Sensor Integrated with Sensing and Heating Graphene Layers
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- Authors
- Hongkyw Choi, Jin Sik Choi, Jin-Soo Kim, Jong-Ho Choe, Kwang Hyo Chung, Jin-Wook Shin, Jin Tae Kim, Doo-Hyeb Youn, Ki-Chul Kim, Jeong-Ik Lee, Sung-Yool Choi, Philip Kim, Choon-Gi Choi, Young-Jun Yu
- Issue Date
- 2014-09
- Citation
- Small, v.10, no.18, pp.3685-3691
- ISSN
- 1613-6810
- Publisher
- Wiley-Blackwell
- Language
- English
- Type
- Journal Article
- 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 fl exible functionalities which cannot be expected from solid-state gas sensors. In order to attain a fast response and rapid recovering time, the fl exible sensors also require integrated fl exible and transparent heaters. Here, large-scale fl exible 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 signifi cant signal degradation under exposure to NO 2 gas.
- KSP Keywords
- Bending strain, Carbon bonding, Device structure, Fast Response, Gas molecule sensing, Graphene Devices, Graphene layers, NO 2, Sensing Performance, Sensor device, Sp 2