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Robust Superlubricity by Strain Engineering

Abstract

Structural superlubricity, a nearly frictionless state between two contact solid surfaces, has attracted rapidly increasing attention during the past few years. Yet a key problem for its promising applications is to reduce the high anisotropy of friction which always leads to its failure. Here we study the friction for a graphene flake sliding on top of a graphene substrate using molecular dynamics simulation. The results show that by applying strain on the substrate, biaxial stretching is better than uniaxial stretching in terms of reducing interlayer friction. Importantly, we find that robust superlubricity can be achieved both via biaxial or uniaxial stretching, namely, for stretching above a critical strain which has been achieved experimentally, the friction is no longer dependent on the relative orientation mainly due to the complete lattice mismatch. The underlying mechanism is revealed to be the Moiré pattern formed. These findings provide a viable approach for the realization of robust superlubricity through strain engineering.

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Publication details

The article was received on 30 Sep 2018, accepted on 06 Jan 2019 and first published on 07 Jan 2019


Article type: Paper
DOI: 10.1039/C8NR07963C
Citation: Nanoscale, 2019, Accepted Manuscript
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    Robust Superlubricity by Strain Engineering

    K. Wang, W. Ouyang, W. Cao, M. Ma and Q. Zheng, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C8NR07963C

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