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We report here an atomistic study of the mechanical deformation of AuxCu(1-x)atomic-size wires (NWs) by means of high resolution transmission electronmicroscopy (HRTEM) experiments. Molecular dynamics simulations were alsocarried out in order to obtain deeper insights on the dynamical properties ofstretched NWs. The mechanical properties are significantly dependent on thechemical composition that evolves in time at the junction; some structuresexhibit a remarkable de-alloying behavior. Also, our results represent thefirst experimental realization of mixed linear atomic chains (LACs) amongtransition and noble metals; in particular, surface energies induce chemicalgradients on NW surfaces that can be exploited to control the relative LACcompositions (different number of gold and copper atoms). The implications ofthese results for nanocatalysis and spin transport of one-atom-thick metalwires are addressed.

Surface Effects on the Mechanical Elongation of AuCu Nanowires: De-alloying and the Formation of Mixed Suspended Atomic Chains