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Correlating Surface Structures and Nanoscale Friction of CVD Multi-layered Graphene
M. G. Choi(최민기),S. Park(박선하),H. Lee(이하범),S. Kim(김송길) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Surface structures which are ubiquitous in chemical vapor deposition (CVD) grown graphene determine functional properties of graphene and in-depth understanding about the relationship between the structures and the properties is essential for investigating CVD grown graphene in a variety of scientific and engineering applications. Here, we correlate various surface structures with nanoscale friction of CVD grown multi-layered graphene islands. By perfectly cleaning graphene surface by mechanical scratching of polymeric surface contamination, we unveiled the surface structures such as small-scale and large-scale (Folded) wrinkles on graphene by the combinatory analysis of atomic force microscopy and Raman spectroscopy. The formation of such the structures was found to induce the top-most graphene layer twisted over the underlying AB-stacked multiple layers of graphene, and the increased interlayer distance by the twisted top-most graphene layer influences the layer-dependent nanoscale friction of multi-layer graphene as revealed by friction force microscopy (FFM). Strong layer-dependency of the nanoscale friction was observed at a high enough normal load due to the difference in lateral bending stiffness, but no identifiable layer-dependency was observed at the low normal load. Increasing the normal load resulted in the transitional change of the layer-dependency on nanoscale friction of multi-layered graphene, which can be attributed