Conductive edge-warping graphite mesas for robust structural superlubricity

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外文摘要：Structural superlubricity(SSL)refers to a state of ultralow friction and zero wear when two solid surfaces slide against each other.Recent investigations have identified amorphous carbon at the edge of the graphite mesa as the primary source of friction in such SSL systems.Here,the tensile stress of metal thin film is exploited to engineer vertically conductive edge-warping graphite mesas(EWGM).Through this approach,robust SSL performance is realized,demonstrated by sliding an 8 µm side length square EWGM on an atomically smooth Au substrate for 10000 cycles at a constant voltage of 1 mV.In this SSL system,differential friction coefficients lower than 1.5 × 10-4 are achieved,with static contact resistance between EWGM and Au substrate as low as 28 Ω and sliding contact resistance as low as 32 Ω.Moreover,the EWGM exhibits SSL behavior on polished Si wafer substrates.Furthermore,because of the no-edge contact with the substrate during sliding,friction is independent of the sliding speed of the EWGM.This study presents the first successful fabrication of conductive EWGM.Remarkably,in both EWGM-Au and EWGM-Si SSL systems,the measured frictions are more than one order of magnitude lower than those of ordinary self-retracting graphite mesas with no-edge warping,and no wear is observed during extended current-carrying sliding.Overall,these findings establish a solid groundwork for the future realization of macroscale conductive SSL systems.

外文关键词：

structural superlubricitygraphite mesacontact resistancetensile stressedge warping

作者：

FENG WeiJia、LIU Ying、MA Ming、PENG DeLi、NIE JinHui

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作者单位：

State Key Laboratory of Tribology in Advanced Equipment & Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China

Center for Nano and Micro Mechanics,Tsinghua University,Beijing 100084,China

Institute of Superlubricity Technology,Research Institute of Tsinghua University in Shenzhen,Shenzhen 518057,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaGuangdong Basic and Applied Basic Research FoundationShenzhen Science and Technology ProgramShenzhen Science and Technology ProgramShenzhen Science and Technology ProgramShenzhen Science and Technology ProgramShenzhen Key Laboratory of Superlubricity Technology

项目编号：

Grant Nos.12204321519611453042022B1515120040Grant Nos.RCBS20210609104540088JCYJ20200109150608043JCYJ20210324J00600001JSGG2022083-1095802004ZDSYS20230626091701002

出版年：

2024

DOI：

10.1007/s11431-024-2707-4

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.(7)