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Atomic Friction Investigations on Ordered Superstructures

Steiner, P; Gnecco, E; Filleter, T; Gosvami, NN; Maier, S; Meyer, E; Bennewitz, R; (2010) Atomic Friction Investigations on Ordered Superstructures. In: TRIBOLOGY LETTERS. (pp. 321 - 327). SPRINGER/PLENUM PUBLISHERS

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We review recent friction measurements on ordered superstructures performed by atomic force microscopy. In particular, we consider ultrathin KBr films on NaCl(001) and Cu(001) surfaces, single and bilayer graphene on SiC(0001), and the herringbone reconstruction of Au(111). Atomically resolved friction images of these systems show periodic features spanning across several unit cells. Although the physical mechanisms responsible for the formation of these superstructures are quite different, the experimental results can be interpreted within the same phenomenological framework. A comparison between experiments and modeling shows that, in the cases of KBr films on NaCl(001) and of graphene films, the tip-surface interaction is well described by a potential with the periodicity of the substrate which is modulated or, respectively, superimposed with a potential with the symmetry of the superstructure.

Type:Proceedings paper
Title:Atomic Friction Investigations on Ordered Superstructures
Event:Conference on Trends in Nanotribology
Location:Trieste, ITALY
Keywords:Nanotribology, Friction mechanisms, Stick-slip, AFM, SCANNING-TUNNELING-MICROSCOPY, FORCE-MICROSCOPE, SURFACES
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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