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학술지 Flexible and Transparent Gas Molecule Sensor Integrated with Sensing and Heating Graphene Layers
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최홍규, 최진식, 김진수, 최종호, 정광효, 신진욱, 김진태, 윤두협, Ki-Chul Kim, 이정익, 최성율, 김필립, 최춘기, 유영준
Small, v.10 no.18, pp.3685-3691
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 제안 키워드
Carbon bonding, Device structure, Gas molecule sensing, Graphene Devices, Graphene layer, NO 2, Optical transmittance, Sensing Performance, Sensor device, Sp 2, Surface-to-volume ratio