Details

Autor(en) / Beteiligte

• Grumelli, D
• Vericat, C
• Benitez, G
• Vela, M. E
• Salvarezza, R. C
• Giovanetti, L. J
• Ramallo-López, J. M
• Requejo, F. G
• Craievich, A. F
• Shon, Y. S

Titel

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

Ist Teil von

• Journal of physical chemistry. C, 2007-05, Vol.111 (19), p.7179-7184

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2007

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.