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Publication
Electrochimica Acta
Paper
In situ scanning tunneling microscopy at potential controlled Ag(100) substrates
Abstract
Chemically polished Ag(100) electrodes with and without lead adsorbates and phase deposits were investigated in situ in 0.5 M NaClO4 by Scanning Tunneling Microscopy (STM), using a potentiostatic STM assembly. During the potential-controlled lead adsorption and phase deposition, the tunneling mode was maintained. On the lead-free electrode surface, parts with flat terraces of about 5-20 nm width, where monoatomic steps are resolved, are interspersed by densely terraced dome-shaped domains. Lead adsorption is accompanied by displacement of steps and smoothing of sub-nm corrugations, as well as by a steeper decay of the tunneling current with tip-substrate separation. Along certain parts of the substrate, repetitive Pb phase deposition/dissolution leads to formation of pronounced nm-scale steps on the Ag substrate. © 1989.