Fullerenethiolate-functionalized gold nanoparticles: A new class of surface-confined metal-C-60 nanocomposites

This paper reports the preparation and characteristic property of a new nan ocomposite gold cluster with fullerene as a carbon nanocluster, C-60-Au nan oparticles, together wit h the first account of electrochemical comparison of the C-60-Au nanoparticle films and the self-assembled monolayers of C-60 -thiol 1 on gold electrodes. Octanethiol-stabilized gold nanoparticles were treated with a fullerene C-60-terminated alkanethiol. (1) to give new full erenethiol-functionalized gold nanoparticles (C-60-Au nanoparticles) of 2 n m diameter with a very narrow size distribution. Immersion of a gold electr ode in a solution of C-60-Au nanoparticles deposited the colloid films of t hem on the electrode surface which showed two distinct reversible reduction /oxidation waves and significant electrochemical stability. The C-60-Au nan oparticle films were firmly immobilized on the planar electrode by a simple self-assembly method without use of terminal ligand like bifunctional amin osiloxane or mercaptosiloxane. The electrochemical responses for the C60-Au nanoparticle films and self-assembled monolayers of C-60-thiol 1 adsorbed on gold electrodes are significantly different.