Shape changes of Pt nanoparticles induced by deposition on mesoporous silica.

Giovanetti, Lisandro J; Ramallo-López, José M; Foxe, Michael; Jones, Louis C; Koebel, Matthias M; Somorjai, Gabor A; Craievich, Aldo F; Salmeron, Miquel B; Requejo, Félix G

Giovanetti, Lisandro J; Ramallo-López, José M; Foxe, Michael; Jones, Louis C; Koebel, Matthias M; Somorjai, Gabor A; Craievich, Aldo F; Salmeron, Miquel B; Requejo, Félix G.

Afiliação

Giovanetti LJ; Instituto de Investigaciones Fisicoquiímicas, Teóricas y Aplicadas (INIFTA), FCE, Universidad Nacional de La Plata - CONICET, Sucursal 4 Casilla de Correo 16 (1900), La Plata, Argentina. lisandro@fisica.unlp.edu.ar

Small ; 8(3): 468-73, 2012 Feb 06.

Article em En | MEDLINE | ID: mdl-22213635

RESUMO

Polyvinylpyrollidone (PVP)-capped platinum nanoparticles (NPs) are found to change shape from spherical to flat when deposited on mesoporous silica substrates (SBA-15). Transmission electron microscopy (TEM), small-angle X-ray scattering (SAXS), and extended X-ray absorption fine structure (EXAFS) analyses are used in these studies. The SAXS results indicate that, after deposition, the 2 nm NPs have an average gyration radius 22% larger than in solution, while the EXAFS measurements indicate a decrease in first neighbor co-ordination number from 9.3 to 7.4. The deformation of these small capped NPs is attributed to interactions with the surface of the SBA-15 support, as evidenced by X-ray absorption near-edge structure (XANES).

Texto completo

Adicionar na Minha BVS

Imprimir

XML

PubMed Links

Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Small Assunto da revista: ENGENHARIA BIOMEDICA Ano de publicação: 2012 Tipo de documento: Article País de afiliação: Argentina País de publicação: Alemanha

Texto completo

Adicionar na Minha BVS

Imprimir

XML

PubMed Links

Buscar no Google