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8 October 2004 Self-assembled gold nanowires from nanoparticles: an electronic route towards DNA nanosensors
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We present a new technique for fabricating gold nanowires using carbon nanotubes as the template. By applying an ac voltage to an electrically contacted single walled carbon nanotube, we generate highly non-uniform ac electric fields in the vicinity of the nanotubes. These ac electric fields serve to polarize 2 nm gold nanoparticles dispersed in solution. The induced dipole moment in the nanoparticles is attracted to the high-intensity field regions at the surface of the nanotube, thus causing a gold nanowire to grow on the surface of the nanotube. Interestingly, we find gold nanowires grow even on nanotubes that are not electrically contacted but in close proximity to the electrodes. Future applications of this work may include DNA sensors based on functionalized Au nanoparticles.
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Lifeng Zheng, Shengdong Li, and Peter J. Burke "Self-assembled gold nanowires from nanoparticles: an electronic route towards DNA nanosensors", Proc. SPIE 5515, Nanoengineering: Fabrication, Properties, Optics, and Devices, (8 October 2004);

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