Direct Growth Out-of-plane Graphene for Application of BioFET

Graphene has garnered more attention as a potential transducer material for field-effect transistors (FET). However, pristine graphene has a disadvantage for sensing applications. To overcome this problem, the introduction of defects into graphene facilitates the immobilisation of bioreceptors on the surface. In this work, we propose direct growth on sputtered copper using atmospheric pressure chemical vapour deposition (APCVD) to synthesis out-of-plane (OOP) graphene to ease the immobilisation of bioreceptors in the future. Raman analysis confirms the formation of OOP graphene from the D, G and 2D peaks. The defects appearing on the graphene were identified in the morphology analysis using FESEM. FTIR analysis was also performed to identify the presence of active sites for bioreceptors immobilisation. The OOP graphene could flow current in the range of microns when the gap of the channel is 25 µm. This shows the potential of OOP graphene as a transducer material in FET for biosensor applications.