Mechanical properties and formation mechanisms of a wire of single gold atoms

Details Mechanical properties and formation mechanisms of a wire of single gold atoms Mechanical properties and formation mechanisms of a wire of single gold atoms

2001-05-14

arxiv.org/abs/cond-mat/0105277v1

Physics

Condensed Matter

To be published in Phys. Rev. Lett. 4 pages with 3 figures

Scientific paper

10.1103/PhysRevLett.87.026101

A scanning tunneling microscope (STM) supplemented with a force sensor is used to study the mechanical properties of a novel metallic nanostructure: a freely suspended chain of single gold atoms. We find that the bond strength of the nanowire is about twice that of a bulk metallic bond. We perform ab initio calculations of the force at chain fracture and compare quantitatively with experimental measurements. The observed mechanical failure and nanoelastic processes involved during atomic wire fabrication are investigated using molecular dynamics (MD) simulations, and we find that the total effective stiffness of the nanostructure is strongly affected by the detailed local atomic arrangement at the chain bases.

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