Solving the structure of bimetallic particles with EXAFS

M. MIZRAHI; J.M. RAMALLO LOPEZ; L.G. GIOVANETTI; G. KRYLOVA; F. BÉRON ; K. PIROTA; E. SHEVCHENKO; F. REQUEJO

Campinas

Congreso; 25ª Reunião Anual de Usuários do LNLS; 2015

LNLS - CNPEM - CNPq

We resolved the structure of core-shell bimetallic Co-Pt nanoparticles using Extended X-rayAbsorption Fine Structure (EXAFS) spectroscopy at the Co-K and Pt-L3 edges. Using the results of the EXAFS fits at both edges and theoretical models we could determine the core and shell composition as well as the inner and outer radius of two different bimetallic nanoparticles obtained varying the synthesis conditions. The only compatible structure withour results is a CoPt3@Pt core-shell nanoparticle. Our models are Supported by X-ray fluorescence, Transmition Electron Microscopy and Small Angle X-ray Scattering results.