| 초록 |
Graphene can be used as an active material for sensors by being introduced to versatile substrates. However, since graphene has an atomic monolayer thickness, the surface of substrates can have a significant impact on the electrical properties of graphene, which can alter the sensing characteristics for the target molecules. In this work, we investigated how the NO2 sensing of a graphene-based sensor vary when the effect on the substrate is suppressed using a PS brush, which is well known for removing the effect of charged impurities on the surface. The response of graphene on PS brush-modified substrates was 5.3 times better than that of unmanaged ones. The reduction of unintended doping boosts the charge mobility of graphene, resulting in a substantial decrease in electron mobility due to NO2 adsorption. Surface modification is expected to be able to decouple substrate attributes in graphene sensors using diverse substrates and to give insight into substrate selection. |
