title: Transition from core-shell to Janus chemical configuration for bimetallic nanoparticles.
abstract: In order to determine the possibilities to control the chemical configuration of bimetallic nanoparticles, we have considered CuAg nanoparticles synthesized by a physical route as a model in this study. The synthesis was made by pulsed laser deposition under ultra-high vacuum conditions, via a sequential deposition procedure. We show that the temperature of the substrate and the absolute quantity of Ag in a particle are the main parameters that drive the chemical configuration. To explain the transition from a core-shell configuration to a Janus configuration as a function of Ag quantity, we have conducted density-functional theory calculations and atomistic molecular dynamics simulations to investigate the stability of this system. The results are presented together with the experimental observations.
authors.affiliation: Laboratoire Matériaux et Phénomènes Quantiques, CNRS-UMR 7162, Université Paris Diderot - Paris 7, Case Courrier 7021, 75205 Paris Cedex 13, France. cyril.langlois@insa-lyon.fr
authors.forename: Cyril
authors.initials: C
authors.lastname: Langlois
authors.forename: Z L
authors.initials: ZL
authors.lastname: Li
authors.forename: Jun
authors.initials: J
authors.lastname: Yuan
authors.forename: Damien
authors.initials: D
authors.lastname: Alloyeau
authors.forename: Jaysen
authors.initials: J
authors.lastname: Nelayah
authors.forename: Davide
authors.initials: D
authors.lastname: Bochicchio
authors.forename: Riccardo
authors.initials: R
authors.lastname: Ferrando
authors.forename: Christian
authors.initials: C
authors.lastname: Ricolleau