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Operando Formation of Van der Waals Heterostructures for Achieving Macroscale Superlubricity on Engineering Rough and Worn Surfaces
State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Science Lanzhou 70000 China; Institute of Materials Science and Engineering Lanzhou University Lanzhou 730000 China.ORCID-id: 0000-0002-0520-4753
State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Science Lanzhou 70000 China.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.ORCID-id: 0000-0003-3919-2962
School of Nuclear Science and Technology University of South China Hengyang 421001 China.
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2022 (engelsk)Inngår i: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 32, nr 18, artikkel-id 2111365Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Macroscale superlubricity breakdown of lubricating materials caused by substrate surface roughening and mechanochemical modification poses great challenges for their practical tribological applications. Here, a facile way is reported to access robust macroscale superlubricity in a vacuum environment, via the operando formation of graphene/transition-metal dichalcogenide (TMDC) heterostructures at wear-induced rough surfaces. By trapping active amorphous carbon (a-C) wear products between TMDC flakes, the sandwich structures readily transform into graphene/TMDC heterostructures during running-in stage, based on shear-induced confinement and load-driven graphitization effects. Then they assemble into multipoint flake-like tribofilms to achieve macroscale superlubricity at steady stage by reducing contact area, eliminating strong cross-interface carbon–carbon interactions and polishing a-C rough nascent surface. Atomistic simulations reveal the preferential formation of graphene/TMDC heterostructures during running-in stage and demonstrate the superlubric sliding of TMDCs on the graphene. The findings are of importance to achieve robust superlubricity and provide a good strategy for the synthesis of other van der Waals heterostructures.

sted, utgiver, år, opplag, sider
John Wiley & Sons, 2022. Vol. 32, nr 18, artikkel-id 2111365
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URN: urn:nbn:se:ltu:diva-89448DOI: 10.1002/adfm.202111365ISI: 000745526000001Scopus ID: 2-s2.0-85123476280OAI: oai:DiVA.org:ltu-89448DiVA, id: diva2:1642444
Merknad

Validerad;2022;Nivå 2;2022-05-31 (johcin);

Funder: National Natural Science Foundation of China (52005233, 51905517, 51661135022); Swiss National Science Foundation and the Swiss Institute for Nanoscience, and LICP Cooperation Foundation for Young Scholars (HZJJ20-01); CAS “Light of West China” Program.

Tilgjengelig fra: 2022-03-07 Laget: 2022-03-07 Sist oppdatert: 2022-05-31bibliografisk kontrollert

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