Charge-induced ultralow friction between graphite and atomically flat surfaces

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F24%3A00373683" target="_blank" >RIV/68407700:21230/24:00373683 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.carbon.2024.119036" target="_blank" >https://doi.org/10.1016/j.carbon.2024.119036</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.carbon.2024.119036" target="_blank" >10.1016/j.carbon.2024.119036</a>

Result language

angličtina

Original language name

Charge-induced ultralow friction between graphite and atomically flat surfaces

Original language description

Reaching near-zero friction is one of the jewels on the crown of tribology, and structural superlubricity is a crucial mechanism to achieve it. Previous works focus mainly on the structural superlubricity at incommensurate crystalline interfaces. However, realizing such interfaces on a large scale without defects and contaminations is a formidable challenge. Here, we report a charge-induced robust macroscale superlubricity between graphite and atomically flat surfaces in the ambient condition. We transferred graphite flakes on Si3N4 balls and used them to measure the friction properties on pristine and charged atomically flat surfaces such as 300 nm SiO2/Si and sapphire. We found that the surface charge can dramatically reduce the coefficient of friction between graphite and substrates by two orders of magnitude to 10-4, and the sliding is wearless even under harsh contact conditions (~1.1 GPa center pressure and >100 m). We demonstrate that the surface charge is critical in achieving superlubricity possibly because it can reduce adhesion between graphite and substrate surfaces and make the substrate surfaces resistant to contaminations. Our method offers a ready-to-use solution to superlubricity alternative to achieve incommensurate crystalline interfaces. Thus, it can reduce the difficulty of realizing macroscale superlubricity for applications.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20506 - Coating and films

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Carbon

ISSN

0008-6223

e-ISSN

1873-3891

Volume of the periodical

223

Issue of the periodical within the volume

April

Country of publishing house

GB - UNITED KINGDOM

Number of pages

11

Pages from-to

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UT code for WoS article

001219295000001

EID of the result in the Scopus database

2-s2.0-85188110258