Effect of surface morphology on friction of graphene on various substrates

Dae Hyun Cho, Lei Wang, Jin Seon Kim, Gwan Hyoung Lee, Eok Su Kim, Sunhee Lee, Sang Yoon Lee, James Hone, Changgu Lee

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Abstract

The friction of graphene on various substrates, such as SiO2, h-BN, bulk-like graphene, and mica, was investigated to characterize the adhesion level between graphene and the underlying surface. The friction of graphene on SiO2 decreased with increasing thickness and converged around the penta-layers due to incomplete contact between the two surfaces. However, the friction of graphene on an atomically flat substrate, such as h-BN or bulk-like graphene, was low and comparable to that of bulk-like graphene. In contrast, the friction of graphene folded onto bulk-like graphene was indistinguishable from that of mono-layer graphene on SiO2 despite the ultra-smoothness of bulk-like graphene. The characterization of the graphene's roughness before and after folding showed that the corrugation of graphene induced by SiO2 morphology was preserved even after it was folded onto an atomically flat substrate. In addition, graphene deposited on mica, when folded, preserved the same corrugation level as before the folding event. Our friction measurements revealed that graphene, once exfoliated from the bulk crystal, tends to maintain its corrugation level even after it is folded onto an atomically flat substrate and that ultra-flatness in both graphene and the substrate is required to achieve the intimate contact necessary for strong adhesion.

Original languageEnglish
Pages (from-to)3063-3069
Number of pages7
JournalNanoscale
Volume5
Issue number7
DOIs
Publication statusPublished - 2013 Dec 1

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Cho, D. H., Wang, L., Kim, J. S., Lee, G. H., Kim, E. S., Lee, S., Lee, S. Y., Hone, J., & Lee, C. (2013). Effect of surface morphology on friction of graphene on various substrates. Nanoscale, 5(7), 3063-3069. https://doi.org/10.1039/c3nr34181j