13:30 〜 15:30
▲ [5p-PA1-43] Correlation of chemical state and adhesion force to nanotribological properties of graphene oxide
キーワード：Graphene oxide, Nanotribology, Surface
Recently, the tribological properties of graphene oxide (GO) has been widely investigated as it can be used as a solid lubricant on solid substrate at micro/ nano-scales. In this study, GO was dispersed on the hydrogen terminated silicon substrate (H-Si) and was reduced by using vacuum-ultraviolet (VUV) light irradiation. Contact-mode atomic force microscopy (AFM) measurements showed that the friction force of the reduced graphene oxide (rGO) regions was smaller than that of the GO regions at various load force condition. The difference of surface chemical states between rGO and GO could lead to the difference of friction properties as revealed by X-ray photoelectron spectroscopy (XPS) analyses. The relationship between adhesion force and friction force of rGO/GO pattern was studied by combining the adhesion force image with the lateral force mapping image. The experimental results showed that, the region of rGO with smaller adhesion force corresponded to less friction force, indicating that the less interaction between the tip and surface. It is noted that the residual solvent layer on substrate surface also played an important role on nano-tribological properties, which will be discussed at the conference.