Chemical composition anomalies of nanotubes stretched from Au-Si(Ge) liquid alloy by an intense electric field

Joyes, P.; Van de Walle, J.; Tarento, R.-J.
December 2009
Applied Physics Letters;12/14/2009, Vol. 95 Issue 24, p243111
Academic Journal
Nanotubes are stretched by intense electric fields (few volts per angstrom) supplied by an eutectic Au0.73Ge0.27 or Au0.82Si0.18 alloy liquid metal ion source. Chemical composition anomalies are observed in the stretched nanotubes. In the Au-Ge system, nanotubes are the smaller two-shell pure gold nanowires. In the Au-Si system, nanotubes have same geometric structures as previously but now silicon atoms can substitute gold atoms. Nanotubes are mainly formed by SiAu3 alloy zones separated by smaller pure gold parts. Our results are consistent with local modifications of the chemical composition of the alloy liquid in the nanotube vicinity submitted to intense electric field gradients.


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