Fine defect engineering of graphene friction
EntityUAM. Departamento de Física de la Materia Condensada; UAM. Departamento de Física Teórica de la Materia Condensada
10.1016/j.carbon.2021.06.064Carbon 182 (2021): 735-741
Funded byWe acknowledge financial support from Spanish MINECO (projects PID2019-106268GB-C31, PID2019-104272RB-C52, ENE2016-79282-C5-4, and MAT2017-83273-R); Comunidad de Madrid (S2018/NMT-4511, NMAT, 2D-CM); and Ramón Areces Foundation. RP, JG-H, and CG-N acknowledge support from the Spanish Ministry of Science and Innovation, through the “María de Maeztu” Programme for Units of Excellence in R&D (CEX2018-000805-M)
ProjectGobierno de España. PID2019-106268GB-C31; Gobierno de España. PID2019-104272RB-C52; Gobierno de España. ENE2016-79282-C5-4-R; Gobierno de España. MAT2017-83273-R; Gobierno de España. CEX2018-000805-M
SubjectsGraphene; Friction; Vacancies; Defects; Tribology; Física
Rights© 2021 The Authors
Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Two-dimensional materials, in particular graphene, exhibit a low friction coefficient and good wear properties. However, the tribological properties of these materials strongly depend on faint differences at the atomic level, and the coexistence of different type of atomic defects in studied samples up to date led to experimental results difficult to reconcile. In our work, we quantified the influence of controlled induced atomic monovacancies on the frictional behaviour of graphene. Less than 0.1% of atomic vacancies induced a fivefold increase in the effective friction coefficient. We showed that friction force microscopy resolved monoatomic vacancies and provided the real-space distribution of their influence on the tribology of graphene. Two factors contributed to this increment in friction: one was related to enhanced reactivity of dangling bonds localized at the monovacancy (~1 nm2 ), that accounted for ~20% of the increase; and a more extended one (~25 nm2 ) arose from the long-range strain distribution around these defects, characteristic of graphene. These results unveil the subtle connection between friction, reactivity, and mechanical properties in two-dimensional materials
Google Scholar:Zambudio, Aitor - Gnecco, Enrico - Colchero, Jaime - Pérez Pérez, Rubén - Gómez Herrero, Julio - Gómez-Navarro González, Cristina
This item appears in the following Collection(s)
Showing items related by title, author, creator and subject.