title: Sono and electrochemical synthesis and characterization of copper core-silver shell nanoparticles.
abstract: Cu-Ag core-shell nanopowders have been prepared by ultrasound-assisted electrochemistry followed by a displacement reaction. The composition of the particles has been determined by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). The XRD patterns versus time displacement show that higher are the silver peaks intensities, weaker are the copper ones. That exhibits the progressive recovering of copper by silver. EDX results and quartz crystal microbalance results indicate that various reaction mechanisms are implied in this process. Transmission electron microscopy (TEM) points out variable nanometric diameter grain and some small agglomerates. Elemental mapping obtained by electron energy-loss spectroscopy (EELS) underlines the core-shell structure.
authors.affiliation: LACM-DTI, LRC-CEA 0534/EA 4302, UFR Sciences Exactes et Naturelles, BP 1039, F-51687 Reims, Cedex 2, France. valerie.mancier@univ-reims.fr
authors.forename: Valérie
authors.initials: V
authors.lastname: Mancier
authors.forename: Céline
authors.initials: C
authors.lastname: Rousse-Bertrand
authors.forename: Jean
authors.initials: J
authors.lastname: Dille
authors.forename: Jean
authors.initials: J
authors.lastname: Michel
authors.forename: Patrick
authors.initials: P
authors.lastname: Fricoteaux