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Thiol-Capped Gold Nanoparticles on Graphite: Spontaneous Adsorption and Electrochemically Induced Release

2007; American Chemical Society; Volume: 111; Issue: 19 Linguagem: Inglês

10.1021/jp071357t

1932-7455

Doris Grumelli, Carolina Vericat, Guillermo Benítez, M. E. Vela, R. C. Salvarezza, Lisandro J. Giovanetti, J. Lopez, Félix G. Requejo, A. F. Craievich, Young‐Seok Shon,

Molecular Junctions and Nanostructures

Gold nanoparticle-(AuNP)-modified carbon graphite surfaces have been prepared by simple immersion of highly oriented pyrolytic graphite (HOPG) in hexane solutions containing 3 nm diameter butanethiol- or nonanethiol-capped nanoparticles. The AuNP adsorb on the HOPG surface free of unbounded thiols, remaining unchanged with time. The amount of adsorbed thiol-protected AuNP depends on concentration and time. The reductive desorption of thiols from the AuNP produces an efficient release of more than 90% of the AuNP from the carbon surface to the aqueous solution. The remaining thiol-free Au nanoparticles do not sinter on the HOPG, forming stable and electrochemically active islands. These results could open interesting possibilities for easy transfer of thiol-capped metallic NP from one environment to another, for controlled release of biomolecules from metallic NP, and for the preparation of catalytic or decontamination systems on large area C surfaces.