Structural superlubricity of platinum on graphite under ambient conditions: the effects of chemistry and geometry

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buir.contributor.authorDurgun, Engin
dc.citation.issueNumber21en_US
dc.citation.volumeNumber111en_US
dc.contributor.authorÖzoǧul, A.en_US
dc.contributor.authorIpek, S.en_US
dc.contributor.authorDurgun, Enginen_US
dc.contributor.authorBaykara, M. Z.en_US
dc.date.accessioned2018-04-12T11:06:15Z
dc.date.available2018-04-12T11:06:15Z
dc.date.issued2017en_US
dc.departmentDepartment of Mechanical Engineeringen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractAn investigation of the frictional behavior of platinum nanoparticles laterally manipulated on graphite has been conducted to answer the question of whether the recent observation of structural superlubricity under ambient conditions [E. Cihan, S. Ipek, E. Durgun, and M. Z. Baykara, Nat. Commun. 7, 12055 (2016)] is exclusively limited to the gold-graphite interface. Platinum nanoparticles have been prepared by e-beam evaporation of a thin film of platinum on graphite, followed by post-deposition annealing. Morphological and structural characterization of the nanoparticles has been performed via scanning electron microscopy and transmission electron microscopy, revealing a crystalline structure with no evidence of oxidation under ambient conditions. Lateral manipulation experiments have been performed via atomic force microscopy under ambient conditions, whereby results indicate the occurrence of structural superlubricity at mesoscopic interfaces of 4000-75 000 nm2, with a noticeably higher magnitude of friction forces when compared with gold nanoparticles of similar contact areas situated on graphite. Ab initio simulations of sliding involving platinum and gold slabs on graphite confirm the experimental observations, whereby the higher magnitude of friction forces is attributed to stronger energy barriers encountered by platinum atoms sliding on graphite, when compared with gold. On the other hand, as predicted by theory, the scaling power between friction force and contact size is found to be independent of the chemical identity of the sliding atoms, but to be determined by the geometric qualities of the interface, as characterized by an average "sharpness score" assigned to the nanoparticles.en_US
dc.identifier.doi10.1063/1.5008529en_US
dc.identifier.issn0003-6951
dc.identifier.urihttp://hdl.handle.net/11693/37216
dc.language.isoEnglishen_US
dc.publisherAmerican Institute of Physics Inc.en_US
dc.relation.isversionofhttps://doi.org/10.1063/1.5008529en_US
dc.source.titleApplied Physics Lettersen_US
dc.subjectAtomic force microscopyen_US
dc.subjectDepositionen_US
dc.subjectElectron microscopyen_US
dc.subjectFrictionen_US
dc.subjectGolden_US
dc.subjectHigh resolution transmission electron microscopyen_US
dc.subjectNanoparticlesen_US
dc.subjectPlatinumen_US
dc.subjectScanning electron microscopyen_US
dc.subjectTransmission electron microscopyen_US
dc.subjectTribologyen_US
dc.subjectAb initio simulationsen_US
dc.subjectCrystalline structureen_US
dc.subjectFrictional behavioren_US
dc.subjectGraphite interfacesen_US
dc.subjectLateral manipulationsen_US
dc.subjectPlatinum nano-particlesen_US
dc.subjectPost deposition annealingen_US
dc.subjectStructural characterizationen_US
dc.subjectGraphiteen_US
dc.titleStructural superlubricity of platinum on graphite under ambient conditions: the effects of chemistry and geometryen_US
dc.typeArticleen_US

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