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Published on: January 15, 2015
Shape changes of Pt nanoparticles induced by deposition on mesoporous silica
Lisandro J Giovanetti1, José M Ramallo-López, Michael Foxe
1Instituto de Investigaciones Fisicoquıímicas, 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
Abstract:
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).
