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The fabrication and optical properties of highly crystalline ultra-long Cu-doped ZnO nanowires

Shao-Min Zhou1, Xiao-Hong Zhang1,3, Xiang-Min Meng1, Kai Zou1, Xia Fan1, Shi-Kang Wu1 and Shuit-Tong Lee1,2,3

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We demonstrate the bulk synthesis of single crystalline Cu-doped ZnO nanowires using (CuI+ZnI2) powders at 600 °C. These mass nanowires are characterized through x-ray diffraction, scanning electron microscopy, energy dispersive x-ray spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction, and high-resolution TEM; they have uniform diameters of about 65 nm and are several tens of microns in length. The growth of ZnCuO nanowires is suggested for self-catalyzed vapour–liquid–solid. In particular, the PL spectra of these nanowires show emission peaks that strongly shift to long wavelength with increasing Cu, and the doping quantity is found to be responsible for the different characteristics; the PL mechanism is explained in detail.


PACS

81.07.Vb Quantum wires

61.05.J- Electron diffraction and scattering

61.05.cp X-ray diffraction

61.72.uj III–V and II–VI semiconductors

78.67.Lt Quantum wires

78.55.Hx Other solid inorganic materials

Subjects

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Nanoscale science and low-D systems

Dates

Issue 9 (September 2004)

Received 27 March 2004

Published 1 July 2004



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