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Title: Surface effects on the mechanical elongation of AuCu nanowires: De-alloying and the formation of mixed suspended atomic chains

We report here an atomistic study of the mechanical deformation of Au{sub x}Cu{sub (1−x)} atomic-size wires (nanowires (NWs)) by means of high resolution transmission electron microscopy experiments. Molecular dynamics simulations were also carried out in order to obtain deeper insights on the dynamical properties of stretched NWs. The mechanical properties are significantly dependent on the chemical composition that evolves in time at the junction; some structures exhibit a remarkable de-alloying behavior. Also, our results represent the first experimental realization of mixed linear atomic chains (LACs) among transition and noble metals; in particular, surface energies induce chemical gradients on NW surfaces that can be exploited to control the relative LAC compositions (different number of gold and copper atoms). The implications of these results for nanocatalysis and spin transport of one-atom-thick metal wires are addressed.
Authors:
 [1] ;  [2] ; ; ;  [1] ;  [3] ; ;  [4]
  1. Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, R. Sergio B. de Holanda 777, 13083-859 Campinas-SP (Brazil)
  2. (Brazil)
  3. Laboratório Nacional de Nanotecnologia-LNNANO, 13083-970 Campinas-SP (Brazil)
  4. Departamento de Física, ICE, Universidade Federal de Juiz de Fora, 36036-330 Juiz de Fora-MG (Brazil)
Publication Date:
OSTI Identifier:
22413213
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ATOMS; CHEMICAL COMPOSITION; COMPUTERIZED SIMULATION; COPPER; ELECTRIC CONTACTS; GOLD; INTERMETALLIC COMPOUNDS; MECHANICAL PROPERTIES; MOLECULAR DYNAMICS METHOD; NANOWIRES; SPIN; SURFACE ENERGY; SURFACES; TRANSMISSION ELECTRON MICROSCOPY