Friction of graphene on a substrate with a cavity defect

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外文摘要：The frictional behavior of supported graphene is known to be influenced by the physical properties and surface morphologies of the underlying substrate.However,it is unclear how a surface defect on the substrate affects the friction of supported graphene,and it is even unknown how to define the defect-induced friction force in this context.Here we conduct molecular dynamics(MD)simulations to investigate the friction between a square diamond slider and a graphene sheet supported by a copper substrate with a surface cavity defect.Our results demonstrate that the defect-induced friction exhibits a nonlinear increase with cavity size,while it decreases nonlinearly with slider size.We propose that the definition of defect-induced friction can be linked to the increase in friction work over the length of the slider,and is closely correlated to the defect-induced relative change in indentation depth and the ratio of the cavity area to the contact area.These findings provide a comprehensive evaluation of the impact of a substrate cavity defect on the friction of supported graphene and offer insights that may have broader implications for understanding defect-induced friction in other two-dimensional materials.

外文关键词：

frictiongrapheneunderneath substratecavity defect

作者：

ZHOU Peng、HUO ZhanLei、CHANG TienChong

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作者单位：

Shanghai Institute of Applied Mathematics and Mechanics,Shanghai Key Laboratory of Mechanics in Energy Engineering,Shanghai Frontier Science Center of Mechanoinformatics,School of Mechanics and Engineering Science,Shanghai University,Shanghai 200072,China

The Center for Computational Mechanics and Engineering Applications,Provincial Mechanics Experimental Teaching Demonstration Center,School of Civil Engineering,Hebei University of Engineering,Handan 056038,China

Shanghai Institute of Aircraft Mechanics and Control,Tongji University,Shanghai 200092,China

Joint-Research Center for Computational Materials,Zhejiang Laboratory,Hangzhou 311100,China

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基金：

National Natural Science Foundation of ChinaKey Research Project of Zhejiang Laboratory

项目编号：

121320082021PE0AC02

出版年：

2024

DOI：

10.1007/s11431-023-2634-9

中国科学:技术科学(英文版)

中国科学院

中国科学:技术科学(英文版)

CSTPCDEI

影响因子：1.056

ISSN：1674-7321

年,卷(期)：2024.67(9)