Copper-doped zinc oxide nanowires were fabricated on copper-coated silicon substrate by
sintering a mixture of zinc oxide and graphite powders at high temperature. Copper
functioned as a catalyst in the zinc oxide nanowire growth and was incorporated during the
growth as a dopant. The size of copper-doped zinc oxide nanowires ranges from 30 to
100 nm in diameter and tens to hundreds of microns in length. The photoluminescent
excitation spectra showed multiple absorption peaks in the ultraviolet and blue/green
region. Correspondingly, broad and continuous photoluminescence spectra were observed
extending from the ultraviolet to the red region with shoulder peaks at room temperature,
which is different from that of the bulk. The x-ray photoelectron spectroscopy and low
temperature photoluminescence were employed to analyse the luminescent mechanism.
Co3O4 nanorods were prepared by improving traditional molten salt synthesis; the length and diameters of the Co3O4 nanorods were about 10 microns and 40-100 nm, respectively; the mechanism of formation of the Co3O4 nanorods is discussed.
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