Letter abstract


Nature Nanotechnology 4, 149 - 152 (2009)
Published online: 25 January 2009 | doi:10.1038/nnano.2008.414

Subject Categories: Nanomaterials | Structural properties

Observation of the smallest metal nanotube with a square cross-section

M. J. Lagos1,2, F. Sato2, J. Bettini1, V. Rodrigues2, D. S. Galvão2 & D. Ugarte1,2


Understanding the mechanical properties of nanoscale systems requires a range of measurement techniques and theoretical approaches to gather the relevant physical and chemical information. The arrangements of atoms in nanostructures and macroscopic matter can be different, principally due to the role of surface energy, but the interplay between atomic and electronic structure in association with applied mechanical stress can also lead to surprising differences. For example, metastable structures such as suspended chains of atoms1, 2, 3 and helical wires4, 5 have been produced by stretching metal junctions. Here, we report the spontaneous formation of the smallest possible metal nanotube with a square cross-section during the elongation of silver nanocontacts. Ab initio calculations and molecular simulations indicate that the hollow wire forms because this configuration allows the surface energy to be minimized, and also generates a soft structure capable of absorbing a huge tensile deformation.

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  1. Laboratório Nacional de Luz Síncrotron, C.P. 6192, 13083-970 Campinas SP, Brazil
  2. Instituto de Física ‘Gleb Wataghin’, Universidade Estadual de Campinas-UNICAMP, 13083-970 Campinas SP, Brazil

Correspondence to: D. Ugarte1,2 e-mail: dmugarte@ifi.unicamp.br



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