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나노물질 및 화학반응 연구단
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Nanotribological Properties of Fluorinated, Hydrogenated, and Oxidized Graphenes Highly Cited Paper

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Title
Nanotribological Properties of Fluorinated, Hydrogenated, and Oxidized Graphenes
Author(s)
Ko, Jae-Hyeon; Kwon, Sangku; Byun, Ik-Su; Choi, Jin Sik; Park, Bae Ho; Yong-Hyun Kim; Jeong Young Park
Publication Date
2013-05
Journal
TRIBOLOGY LETTERS, v.50, no.2, pp.137 - 144
Publisher
SPRINGER/PLENUM PUBLISHERS
Abstract
Recently, the tribological properties of graphene have been intensively examined for potential applications in micro- and nano-mechanical graphene-based devices. Here, we report that the tribological properties can be easily altered via simple chemical modifications of the graphene surface. Friction force microscopy measurements show that hydrogenated, fluorinated, and oxidized graphenes exhibit, 2-, 6-, and 7-fold enhanced nanoscale friction on their surfaces, respectively, compared to pristine graphene. The measured nanoscale friction should be associated with the adhesive and elastic properties of the chemically modified graphenes. Density-functional theory calculations suggest that, while the adhesive properties of chemically modified graphenes are marginally reduced down to *30 %, the out-of-plane elastic properties are drastically increased up to 800 %. Based on these findings, we propose that nanoscale friction on graphene surfaces is characteristically different from that on conventional solid surfaces; stiffer graphene exhibits higher friction, whereas a stiffer three-dimensional solid generally exhibits lower friction. The unusual friction mechanics of graphene is attributed to the intrinsic mechanical anisotropy of graphene, which is inherently stiff in plane, but remarkably flexible out of plane. The out-of-plane flexibility can be modulated up to an order of magnitude by chemical treatment of the graphene surface. The correlation between the measured nanoscale friction and the calculated outof-plane flexibility suggests that the frictional energy in graphene is mainly dissipated through the out-of-plane vibrations, or the flexural phonons of graphene.
URI
https://pr.ibs.re.kr/handle/8788114/1329
ISSN
1023-8883
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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9_IBS CA1201_TRIBOLOGY LETTERS_50_137_Nanotribological Properties of Fluorinated, Hydrogenated, and Oxidized Graphenes.pdfDownload

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