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| - Self-Assembling of Monolayer-Protected Gold Nanoparticles
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| - Self-assembling of monolayer-protected gold nanoclusters onto a gold electrode surface was reported. Theparticles were surface-active with multiple copies of peripheral thiol groups that resulted from an exchangereaction with alkanedithiols. Excessive dithiol and displaced thiol ligands were removed from the clusterexchange solution via liquid extraction using a hexane−methanol system. The self-assembling process appearedto be rather fast, similar to that for simple alkanethiols. The resulting particle adlayers exhibited discreteelectron-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 modulationwith electrode potentials. Consistent electron-transfer rate constants were obtained from the Laviron evaluationas well as from the impedance measurements. The electron-charging behaviors were also quite visible inaqueous media when the interparticle “void” space was filled up with low-dielectric organic adlayers. Technicalimplications of these particle assemblies were also discussed.
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