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The Effect of Thickness and Chemical Reduction of Graphene Oxide on Nanoscale Friction

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Title
The Effect of Thickness and Chemical Reduction of Graphene Oxide on Nanoscale Friction
Author(s)
Sangku Kwon; Kyung Eun Lee; Hyunsoo Lee; Sang Joon Koh; Jae-Hyeon Ko; Yong-Hyun Kim; Sang Ouk Kim; Jeong Young Park
Publication Date
2018-09
Journal
JOURNAL OF PHYSICAL CHEMISTRY B, v.122, no.2, pp.543 - 547
Publisher
American Chemical Society
Abstract
The tribological properties of two-dimensional (2D) atomic layers are quite different from three-dimensional continuum materials because of the unique mechanical responses of 2D layers. It is known that friction on graphene shows a remarkable decreasing behavior as the number of layers increases, which is caused by the puckering effect. On other graphene derivatives, such as graphene oxide (GO) or reduced graphene oxide (rGO), the thickness dependence of friction is important because of the possibilities for technical applications. In this report, we demonstrate unexpected layer-dependent friction behavior on GO and rGO layers. Friction force microscopy measurements show that nanoscale friction on GO does not depend on the number of layers; however, after reduction, friction on rGO shows an inverse thickness dependence compared with pristine graphene. We show that the friction on rGO is higher than that on SiO2 at low load, and that an interesting crossover behavior at higher load occurs because of the lower friction coefficient and higher adhesion of the rGO. We provide a relevant interpretation that explains the effect of thickness and chemical reduction on nanoscale friction. © 2017 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/4474
ISSN
1520-6106
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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