Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 116, Issue 49, Pages 24452-24456Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1907947116
Keywords
friction; energy dissipation; superlubricity; graphene; strain engineering
Categories
Funding
- National Natural Science Foundation of China [11772169, 11432008, 11921002, 11832010, 11890682, 11890671]
- National Basic Research Program of China [2015CB351903]
- National Science and Technology Major Project [2017-VI-0003-0073]
- State Key Laboratory of Tribology at Tsinghua University [SKLT2019B02]
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Controlling, and in many cases minimizing, friction is a goal that has long been pursued in history. From the classic Amontons-Coulomb law to the recent nanoscale experiments, the steady-state friction is found to be an inherent property of a sliding interface, which typically cannot be altered on demand. In this work, we show that the friction on a graphene sheet can be tuned reversibly by simple mechanical straining. In particular, by applying a tensile strain (up to 0.60%), we are able to achieve a superlubric state (coefficient of friction nearly 0.001) on a suspended graphene. Our atomistic simulations together with atomically resolved friction images reveal that the in-plane strain effectively modulates the flexibility of graphene. Consequently, the local pinning capability of the contact interface is changed, resulting in the unusual strain-dependent frictional behavior. This work demonstrates that the deformability of atomic-scale structures can provide an additional channel of regulating the friction of contact interfaces involving configurationally flexible materials.
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