GeO_2 nanowires and nanoneedles grown by thermal deposition without a catalyst

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Thermal treatment of compacted GeO_2 powder under argon flow leads to the growth of a dense distribution of microwires and nanowires on the sample surface. Extended treatment causes the formation of more complex structures, including arrays of nanoneedles. Enhanced cathodoluminescence emission is associated with the wires and needles, which show a component at 2.72 eV not observed. for the untreated material.
© 2005 IOP Publishing Ltd. This work was supported by MEC (Project MAT 2003-00455) and CAM (Project GR/MAT 630-04).
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