In-situ Electrochemical Atomic Force Microscopy Studies of Nucleation of Single Nucleus on Microelectrodes

Abstract

Abstract: The electrochemical nucleation and growth of silver single nucleus on glassy car-bon microelectrode have been monitored in-situ with electrochemical atomic force microscopy(ECAFM) at different stages.The AFMresults show that the silver single nucleus forms atthe edge of the glassy carbon and grows to form a crystallite with (100) facet preferentiallydominated.It is confirmed that the nucleation process strongly relies on the condition ofglassy carbon substrate.Multiple nuclei are formed on the substrate with nucleation historybut single nucleus can be achieved on the same substrate after the application of a special"purging" method.The work is the first example for the real time observation of nucleationand growth of a single nucleus on a microelectrode and for the application of ECAFMto thestudies of microelectrode systems.Comparison of the work with previous ex-situ measure-ments are given.The work also demonstrates a possible way to obtain a single crystal micro-electrode which c0uld be valuable for various purposes.

Key words: Microelectrode, Silver single nucleus, Electrochemical atomic force microscopy

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CAI Xiong-Wei, XIE Zhao-Xiong, MAO Bing-Wei. In-situ Electrochemical Atomic Force Microscopy Studies of Nucleation of Single Nucleus on Microelectrodes[J]. Chem. J. Chinese Universities, 1997, 18(4): 577.

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In-situ Electrochemical Atomic Force Microscopy Studies of Nucleation of Single Nucleus on Microelectrodes

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