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Issue 5, 2019
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Robust superlubricity by strain engineering

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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 that limits its promising applications is the high anisotropy of friction which always leads to its failure. Here we study the friction of 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 via both biaxial and 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.

Graphical abstract: Robust superlubricity by strain engineering

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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, 2019,11, 2186-2193

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    Robust superlubricity by strain engineering

    K. Wang, W. Ouyang, W. Cao, M. Ma and Q. Zheng, Nanoscale, 2019, 11, 2186
    DOI: 10.1039/C8NR07963C

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