Self-assembly of platinum nanowires on HOPG

QUAINO, PAOLA MÓNICA; GENNERO DE CHIALVO, MARÍA ROSA; VELA, MARÍA ELENA; SALVAREZZA, ROBERTO C.

Journal of the Argentine Chemical Society

Asoc. Qca. Argentina

Lugar: Buenos Aires; Año: 2005 vol. 93 p. 215 - 224

0365-0375

Platinum nanoparticles were obtained on highly oriented pyrolytic graphite (HOPG) in 0.01 M H2Cl6Pt and 0.1 M HCl solution by open circuit deposition. The resulting structures were characterized electrochemically by cyclic voltammetry and morphologically by ex situ scanning tunneling microscopy. The deposition on the substrate occurs preferentially at step edges instead of flat terraces. The density of particles as well as their dimension depend on the time of immersion in the hexachloroplatinic solution. Pt nanowires are formed for a 3 h immersion time whereas for a 90 s immersion the typical clusters are mainly hemispherical.