摘要：

Electrochemical studies of the self-assembled monolayers of gold nanoparticles were reported. The particle surface assemblies were constructed by using surface-active particle molecules where multiple copies of peripheral thiol groups were introduced via exchange reactions with alkanedithiols^[1,2]. Excessive dithiol and displaced thiol ligands were removed from the cluster exchange solution by liquid extraction using a hexane-methanol system. The resulting particle adlayers exhibited discrete electron-transfer features that were ascribed to the quantized capacitance charging to the particle double layers. The electrode double-layer capacitance, evaluated from impedance measurements, also showed a modulation with electrode potentials. Consistent electron-transfer rate constants were obtained from the Laviron evaluation as well as from the impedance measurements^[1].In particular, in aqueous solutions, in the presence of certain hydrophobic electrolyte ions, the discrete charging was rectified depending on the electrode^[2].

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