Abstract
Noble metallic nanoparticles (NPs) (e.g., Au, Ag, Cu, Ni, and Pt have interesting catalytic and optical properties playing important role in electrocatalysis and spectroscopy enhancement. Ensemble averaging methods are usually applied to characterizing these properties. It remains extremely challenging to resolve electrochemical events of single catalytic NP using conventional quantitative analysis methods. In this study, we present very preliminary results of a spectroelectrochemistry study of single Au NPs at transparent planar electrode and ultramicroelectrode (UME). Our goal of this study is to resolve the electrocatalytic property of single Au NPs with combined methods of electrochemistry and dark field light scattering (DFS). Hydrazine oxidation reaction is used as a model system to characterize the catalytic characteristics of single Au NPs coated onto at a planer indium-tin-oxide (ITO) surface and ITO UMEs. Dark-field spectroelectrochemical study of Au NPs reveals the formation of nitrogen gas from NPs surface accompanied with a decrease in light scattering intensity. Spectroelectrochemistry method used in this work can potentially resolve local redox reactions catalyzed by metallic NPs at the nanometer scales.
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