The role of charge distribution on the friction coefficients of epitaxial graphene grown on the Si-terminated and C-terminated faces of SiC

Yasemin KeskinÖzhan ÜnverdiDogan ErbaharIsmet I. KayaCem CelebiÇelebi, CemÜnverdi, ÖzhanKeskin, YaseminErbahar, DoganKaya, İsmet İnönü2025-10-062021000862230008-62231873-389110.1016/j.carbon.2021.03.0052-s2.0-85102633907https://www.scopus.com/inward/record.uri?eid=2-s2.0-85102633907&doi=10.1016%2Fj.carbon.2021.03.005&partnerID=40&md5=5ef7691eba2e00ec567af448f501662dhttps://gcris.yasar.edu.tr/handle/123456789/8956https://doi.org/10.1016/j.carbon.2021.03.005The friction coefficients of single-layer epitaxial graphene grown on the Si-terminated and C-terminated faces of Silicon Carbide (SiC) substrate were measured under ambient conditions using Friction Force Microscope (FFM). The lateral friction force measurements acquired in the applied normal force range between 4.0 and 16.0 nN showed that the friction coefficient of graphene on the C-terminated face of SiC is about two times smaller than the one grown on its Si-terminated face. The lateral friction was found to be decreased as the average of root mean square roughness increases suggesting the observed difference in the friction coefficients cannot be related to the roughness of the graphene layers. DFT calculations demonstrated that the altered periodicity of charge distribution on graphene due to the specific interactions with two distinct polar faces of SiC substrate might explain the observed difference in the friction coefficients. © 2021 Elsevier B.V. All rights reserved.Englishinfo:eu-repo/semantics/closedAccessAfm, Epitaxial Graphene, Friction Force, Charge Distribution, Friction, Silicon Carbide, Substrates, Afm, Ambient Conditions, Epitaxial Graphene, Friction Coefficients, Friction Force, Friction Force Measurement, Friction Force Microscope, Lateral Friction, Silicon Carbide Substrates, Single Layer, GrapheneCharge distribution, Friction, Silicon carbide, Substrates, AFM, Ambient conditions, Epitaxial graphene, Friction coefficients, Friction force, Friction force measurement, Friction force microscope, Lateral friction, Silicon carbide substrates, Single layer, GrapheneAFMEpitaxial GrapheneFriction ForceThe role of charge distribution on the friction coefficients of epitaxial graphene grown on the Si-terminated and C-terminated faces of SiCArticle