An ultralow amount of platinum can be deposited on gold surface using copper underpotential deposition and galvanic exchange. Although many researches are using this method, they often ignore assessment of precise platinum structure and its effect. Here we report that the structure of deposited platinum can vary depending on the surface structure of underlying gold substrate. Platinum was overgrown on a clean surface of octahedral and cubic gold nanocrystals. The platinum tended to deposit as layers on the octahedral gold nanocrystals with a Au(111) surface, while it aggregated and formed small particles on the cubic gold nanocrystals with a Au(100) surface. Density functional theory calculation and electrochemical CO stripping also supported our observation

Different growth mode of platinum on shape controlled gold nanocrystals

243rd National Meeting (2012)

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