Au nanostructures were potentiostatically electrodeposited (-0.2 V) on Pt electrode (300 um) in 0.5M H2SO4 solution containing 5.0¡Á10-4M HAuCl4 in a classic electrochemical cell several times and for 0.01 s each time. The total charges at the electrode surface were kept at 7.0¡Á10-8C, and then the electrode was rinsed thoroughly with doubly distilled water and allowed to dry in nitrogen at room temperature.
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