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Novel growth mechanism of single crystalline Cu nanorods by electron beam irradiation

Pei-I Wang, Y-P Zhao, G-C Wang and T-M Lu

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Single-crystal Cu nanorods have been fabricated on carbon films by manipulating electron beam irradiation on a Cu powder charge in a transmission electron microscope (TEM). By adjusting the intensity of the electron beam, we observed lively nucleation and growth of the Cu nanorods with the TEM. Individual Cu nanorods are straight with diameters ranging from 40 to 50 nm. The length of the rods is controlled by e-beam irradiation duration, and can be extended to {\sim }1~\micmu {\mathrm {m}} . Selective area electron diffraction showed that the sidewalls of the Cu nanorods were associated with the (110) planes, while facets on the tips were associated with the (111) planes. We believe that the growth process is mainly controlled by high surface mobility of Cu atoms on the C surface, and surface diffusion of the Cu atoms from high surface energy planes to low surface energy planes of the Cu nanorods.


PACS

81.07.De Nanotubes

61.05.J- Electron diffraction and scattering

68.37.Lp Transmission electron microscopy (TEM)

68.35.Fx Diffusion; interface formation

61.46.-w Structure of nanoscale materials

Subjects

Surfaces, interfaces and thin films

Nanoscale science and low-D systems

Dates

Issue 1 (January 2004)

Received 4 July 2003, in final form 14 October 2003

Published 26 November 2003



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