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Hydrophilic gold nanoclusters were tethered onto gold electrodes modified with mixed 1-octane thiol/1,9-nonane dithiol monolayers. The heterogeneous electron transfer (ET) kinetics of soluble redox species in the supporting electrolyte were investigated at these electrodes by cyclic voltammetry (CV) in the presence and absence of the ion-pairing anions PF6- and NO3-. The redox species investigated, [Fe(CN)6]3−/4− and [Co(C12H8N2)3]3+/2+ where oppositely charged. The results presented here reveal that the rate of ET for the negatively charged redox species decreases with decreasing ionic charging time constant of the electrolyte. The opposite trend is observed for the positively charged redox species. Keywords: Gold nanocluster, Quantized charging, Mixed monolayer, Electron transfer kinetics, Blocked surface, Cobalt tris(phenanthroline) |
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