title: Platinum-vanadium oxide nanotube hybrids.
abstract: The present contribution reports on the features of platinum-based systems supported on vanadium oxide nanotubes. The synthesis of nanotubes was carried out using a commercial vanadium pentoxide via hydrothermal route. The nanostructured hybrid materials were prepared by wet impregnation using two different platinum precursors. The formation of platinum nanoparticles was evaluated by applying distinct reduction procedures. All nanostructured samples were essentially analysed by X-ray diffraction and transmission electron microscopy. After reduction, transmission electron microscopy also made it possible to estimate particle size distribution and mean diameter calculations. It could be seen that all reduction procedures did not affect the nanostructure of the supports and that the formation of metallic nanoparticles is quite efficient with an indistinct distribution along the nanotubes. Nevertheless, the reduction procedure determined the diameter, dispersion and shape of the metallic particles. It could be concluded that the use of H2PtCl6 is more suitable and that the use of hydrogen as reducing agent leads to a nanomaterial with unagglomerated round-shaped metallic particles with mean size of 6-7 nm.
authors.affiliation: Laboratório de Catálise, Instituto Nacional de Tecnologia/MCT, Av, Venezuela, 82, sala 518, Centro, Rio de Janeiro, RJ, 20081-31, Brazil. marco.fraga@int.gov.br.
authors.forename: Filipels
authors.initials: F
authors.lastname: Mello
authors.forename: Lídiaoo
authors.initials: L
authors.lastname: Costa
authors.forename: Eduardopadrón
authors.initials: E
authors.lastname: Hernández
authors.forename: Andréamduarte
authors.initials: A
authors.lastname: de Farias
authors.forename: Marco A
authors.initials: MA
authors.lastname: Fraga