Operando Formation of Van der Waals Heterostructures for Achieving Macroscale Superlubricity on Engineering Rough and Worn SurfacesShow others and affiliations
2022 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 32, no 18, article id 2111365Article in journal (Refereed) 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.
Place, publisher, year, edition, pages
John Wiley & Sons, 2022. Vol. 32, no 18, article id 2111365
National Category
Other Mechanical Engineering
Research subject
Machine Elements
Identifiers
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
Note
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.
2022-03-072022-03-072025-04-23Bibliographically approved