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O: Oberflächenphysik

O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)

O 29.84: Poster

Mittwoch, 29. März 2006, 14:30–17:30, P2

Video STM Observation on A(111) Surface and Cu upd Layer in Aqueous Solution — •Koji Suto and Olaf Magnussen — Institut für Experimentelle und Angewandte Physik, Universität Kiel

Dynamics of atom or ion on the electrified interface has been a hot topic on physics and nanotechnology over decades, but there are only a few reports on electrochemical systems. This time we will present some investigation on Au(111) surface in aqueous solution by Video STM (acquiring up to 30 images/s). First, electrochemically induced lifting of reconstruction was investigated in sulfuric acid. Herringbone structure was observed to disappear line by line, and its decay rate was analysed quantitatively. Next, Cu electrodeposition was investigated. It is well known that, by under potential deposition (upd), submonolayer of Cu is formed on Au(111) reductively at slight positive potential towards bulk deposition. Sulfate (√3 x √3) structure, which covered Cu upd layer was seen and the motion of the boundary fluctuating in between two parallel (√3 x √3) domains was observed by Video STM. Dynamic state of bulk deposition was also considered.