On the structure of Au/Pd bimetallic nanoparticles

Mejía Rosales, Sergio y Fernández Navarro, Carlos Javier y Pérez Tijerina, Eduardo y Blom, Douglas A. y Allard, Lawrence F. y Yacamán, Miguel José (2007) On the structure of Au/Pd bimetallic nanoparticles. Journal of physical chemistry C, 111 (3). pp. 1256-1260. ISSN 1256-1260

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Resumen

We performed a study on bimetallic Au/Pd nanoparticles using aberration corrected electron microscopy along with molecular dynamics simulations to investigate the features of specific atomic sites at the surface, which can be related to the high catalytic activity properties of the particles. The calculations mimic the growth of nanoparticles through a cooling process from a molten solid to a crystalline structure at room temperature. We found that the final structure for the alloy particles is neither a cuboctahedral nor an icosahedral,but a complex structure that has a very rough surface and unique isolated Pd sites surrounded by Au atoms. We also found that there is predominance of three specific Pd sites at the surface, which can be directly related to the catalytic activity of the nanoparticles

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