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New Palladium Nanomaterials for Catalysis: Mechanisms Controlling Formation and Evolution of Nanostructures in a Seed-Mediated Synthesis

Published online by Cambridge University Press:  01 February 2011

Laure Bisson ,
Cédric Boissière ,
Clément Sanchez ,
Cécile Thomazeau  and
Denis Uzio
Laure Bisson
Affiliation:
[email protected], Institut Français du Pétrole, Catalyse et Séparation, BP n°3, Vernaison, 69390, France, 0478022020
Cédric Boissière
Affiliation:
[email protected], UPMC, Laboratoire de Chimie de la Matière Condensée de Paris, Paris, 75005, France
Clément Sanchez
Affiliation:
[email protected], Institut Français du Pétrole, Catalyse et Séparation, BP n°3, Vernaison, 69390, France
Cécile Thomazeau
Affiliation:
[email protected], Institut Français du Pétrole, Catalyse et Séparation, BP n°3, Vernaison, 69390, France
Denis Uzio
Affiliation:
[email protected], Institut Français du Pétrole, Catalyse et Séparation, BP n°3, Vernaison, 69390, France
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Abstract

Metallic nanoparticles are commonly used as the active phase of heterogeneous catalysts. Today, a current issue in catalysis research is to determine whether a specific crystallographic plane of the metallic nanoparticle is responsible for activity and selectivity properties in a structure sensible reaction. Following this purpose, metallic nanoparticles with specific morphologies have been studied. In the present work, palladium nanostructured particles are prepared in a surfactant mediated aqueous medium by a seeding growth approach, and present various morphologies : rods, tetrahedra and/or bipyramides, cubes, icosahedra... Synthesis of these nanoparticles and observation of their growth by a detailed Transmission Electron Microscopy study will be presented. We provide evidence that nucleation and growth of these particles are dominated by an aggregative mechanism. Moreover, upon ageing nanostructured particles undergo a ripening process to spherical morphology, attributed to an oxidative etching.

Keywords

nanostructurecrystal growthPd
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1017 , 2007 , 1017-DD16-26
Copyright
Copyright © Materials Research Society 2007

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