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

Autor(es)

Lagos, M. J. ^{[1, 2]} ; Autreto, P. A. S. ^[1] ; Bettini, J. ^[2] ; Sato, F. ^[3] ; Dantas, S. O. ^[3] ; Galvao, D. S. ^[1] ; Ugarte, D. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil

^[2] Lab Nacl Nanotecnol LNNano, BR-13083970 Campinas, SP - Brazil

^[3] Univ Fed Juiz de Fora, ICE, Dept Fis, BR-36036330 Juiz De Fora, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Physics; v. 117, n. 9 MAR 7 2015.
• Citações Web of Science: 3

Resumo

We report here an atomistic study of the mechanical deformation of AuxCu(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. (C) 2015 AIP Publishing LLC. (AU)

• Processo FAPESP: 13/08293-7 - CECC - Centro de Engenharia e Ciências Computacionais
• Beneficiário: Munir Salomao Skaf
• Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs