Nanotribology under electrochemical conditions:influence of a copper(sub)monolayer deposited on single crystal electrodes on friction forces studied with atomic force microscopy

摘要

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.