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.
Highlights
The present contribution reports on the features of platinum-based systems supported on vanadium oxide nanotubes
The design of hybrid nanostructured materials is addressed with special focus on the formation of platinum nanoparticles located on the surface of vanadium oxide nanotubes
Physical chemical properties of vanadium oxide nanotubes (VNT) have been shown to be sensitive to the starting materials and the synthesis procedures, especially the vanadium source, alkylamine used as structure-directing agent and the hydrothermal conditions applied
Summary
The present contribution reports on the features of platinum-based systems supported on vanadium oxide nanotubes. 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. P. Hernandez Departamento de Fısica, Universidade Federal de Pernambuco, Av. Professor Luiz Freire, s/n, Cidade Universitaria, Recife, PE 50670-901, Brazil 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.
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