5:30 PM - 5:45 PM
▲ [25p-E102-16] Effect of Substrate Material on the Resistance Change of Graphene Caused by the Adsorption of Water Molecules
Keywords:graphene, adsorption, interface
In this study, the first principles calculation was applied to the charge transfer analysis between graphene and substrate material and graphene and adsorbed molecules. It was confirmed that both the charge transfers of electrons and holes appeared depending on the material combination at the interface between graphene and a substrate or adsorbed molecules. To validate the analyzed results, graphene sheets were deposited on polydimethylsiloxane (PDMS) and Si substrates. The graphene was synthesized using low-pressure chemical vapor deposition and was transferred to the target substrate using a wet transfer method. The high quality of the transferred mono-layer graphene was validated by Raman spectroscopy. The metallic electrodes were patterned using electron beam evaporation. It was confirmed that the direction of the resistance change under the adsorption of water molecules was strongly influenced by the substrate material. The effect of the interface structure on the resistance change under the adsorption of water molecules was successfully validated. These results clearly show that the properties of graphene are significantly affected by the substrate materials, and it is possible to quantitatively control the performance of graphene-based gas-detecting sensor devices by changing the substrate material.