| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014) | |
| Thin Films | Thursday Sessions |
| Session TF-ThM |
| Session: | Graphene |
| Presenter: | Choon-Gi Choi, Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI), Republic of Korea |
| Correspondent: | Click to Email |
Graphene leading to high surface-to-volume ratio and outstanding conductivity has been applied for gas molecule sensing with fully utilizing its unique transparent and flexible functionalities which cannot be expected from solid-state gas sensors. However, in order to realize the fast responsive and significantly sensitive graphene gas sensor without hampering of both flexibility and transparency, the high quality of sp2 carbon bonding for sharp sensing response are demanded. In this work, we demonstrate large-scale flexible and transparent gas molecule sensor devices, integrated with a graphene sensing channel and a graphene transparent heater for fast recovering operation. This combined all-graphene device structure enable an overall device optical transmittance that exceeds 90% and reliable sensing performance with a bending strain of less than 1.4 %. In particular, we could 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 × 2 cm2 sized sensor with reproducible sensing cycles, including full recovery steps without significant signal degradation under exposure to NO2 gas.
This work was supported by the Creative Research Program of the ETRI (14ZE1110) of Korea and by a grant (Code No. 2011-0031660) from the Center for Advanced Soft Electronics under the Global Frontier Research Program of the Ministry of Education, Science and Technology of Korea.