title: Nanotribology under electrochemical conditions: influence of a copper (sub)monolayer deposited on single crystal electrodes on friction forces studied with atomic force microscopy.
abstract: Friction force measurements performed by means of an atomic force microscope (AFM) under electrochemical conditions on a pure Au(111) electrode surface and one modified with a foreign metal are presented; after deposition of a (sub)monolayer copper on a Au(111) single crystal electrode a large increase of the friction force is observed compared to the pure Au(111) electrode surface; the extent of the increase not only depends on the copper coverage, but also on the normal load and may be explained by a higher energy dissipation due to motion of the sulfate anions adsorbed on the copper atoms induced by the AFM tip.
authors.affiliation: Institute for Physical and Theoretical Chemistry, Roemerstrasse 164, D-53117, Bonn, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Nielinger
authors.forename: Helmut
authors.initials: H
authors.lastname: Baltruschat