In situ friction study of Ag Underpotential deposition (UPD) on Au(111) in aqueous electrolyte.

ABSTRACT: The electrodeposition of silver on Au(111) was investigated using lateral force microscopy (LFM) in Ag⁺ containing sulfuric acid. Friction force images show that adsorbed sulfate forms 3×7R19.1∘ structure ( θsulfate=0.2) on Au(111) prior to Ag underpotential deposition (UPD) and (3×3R30∘) structure ( θsulfate=0.33 ) on a complete monolayer or bilayer of Ag. Variation of friction with normal load shows a non-monotonous dependence, which is caused by increasing penetration of the tip into the sulfate adlayer. In addition, the friction force is influenced by the varying coverage and mobility of Ag atoms on the surface. Before Ag coverage reaches the critical value, the deposited silver atoms may be mobile enough to be dragged by the movement of AFM tip. Possible penetration of the

SUBMITTER: Park I 

PROVIDER: S-EPMC8252634 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature