Molecules on rails: Friction anisotropy and preferential sliding directions of organic nanocrystallites on two-dimensional materials

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dc.citation.issue39
dc.citation.rankM21a
dc.citation.spage18835
dc.citation.volume10
dc.contributor.authorVasić, Borislav
dc.contributor.authorStanković, Igor
dc.contributor.authorMatković, Aleksandar
dc.contributor.authorKratzer, Markus
dc.contributor.authorGanser, Christian
dc.contributor.authorGajić, Radoš
dc.contributor.authorTeichert, Christian
dc.date.accessioned2024-07-01T12:41:28Z
dc.date.available2024-07-01T12:41:28Z
dc.date.issued2018-10-21
dc.description.abstractTwo-dimensional (2D) materials are envisaged as ultra-thin solid lubricants for nanomechanical systems. So far, their frictional properties at the nanoscale have been studied by standard friction force microscopy. However, lateral manipulation of nanoparticles is a more suitable method to study the dependence of friction on the crystallography of two contacting surfaces. Still, such experiments are lacking. In this study, we combine atomic force microscopy (AFM) based lateral manipulation and molecular dynamics simulations in order to investigate the movements of organic needle-like nanocrystallites grown by van der Waals epitaxy on graphene and hexagonal boron nitride. We observe that nanoneedle fragments-when pushed by an AFM tip-do not move along the original pushing directions. Instead, they slide on the 2D materials preferentially along the needles' growth directions, which act as invisible rails along commensurate directions. Further, when the nanocrystallites were rotated by applying a torque with the AFM tip across the preferential sliding directions, we find an increase of the torsional signal of the AFM cantilever. We demonstrate in conjunction with simulations that both, the significant friction anisotropy and preferential sliding directions are determined by the complex epitaxial relation and arise from the commensurate and incommensurate states between the organic nanocrystallites and the 2D materials.
dc.identifier.doi10.1039/c8nr04865g
dc.identifier.issn2040-3364
dc.identifier.issn2040-3372
dc.identifier.scopus2-s2.0-85054899375
dc.identifier.urihttps://pub.ipb.ac.rs/handle/123456789/159
dc.identifier.wos000448421100047
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.relation.ispartofNanoscale
dc.relation.ispartofabbrNanoscale
dc.rightsrestrictedAccess
dc.titleMolecules on rails: Friction anisotropy and preferential sliding directions of organic nanocrystallites on two-dimensional materials
dc.typeArticle
dc.type.versionpublishedVersion
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