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.
Small. 2014 Sep 24;10(18):3685-91. doi: 10.1002/smll.201400434. Epub 2014 May 15.
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.
具有高表面积与体积比和出色导电性的石墨烯，可应用于气体分子感测，充分利用其独特的透明和灵活功能，这是固态气体感测器无法实现的。为了实现快速响应和快速恢复时间，灵活的感测器还需要集成灵活且透明的加热元件。在此，展示了具有石墨烯感测通道和石墨烯透明加热器的大型灵活透明气体分子感测器装置，用于快速恢复操作。这种组合的全石墨烯器件结构使整体器件光透过率超过 90%，并且在小于 1.4%的弯曲应变下具有可靠的感测性能。特别地，由于 sp(2)-碳键合和石墨烯的无序，可以对快速（≈14 s）和慢速（≈95 s）响应进行分类，并且自集成的石墨烯加热器导致 2 cm×2 cm 大小的感测器快速恢复（≈11 s），具有可重复的感测循环，包括在暴露于 NO2 气体下完全恢复步骤，而信号没有明显的衰减。
