Abstract
ZnO nanowires were grown on Si (1 0 0) substrates by oxidation of metallic Zn powder at 600 °C. Sea-urchin-like nanostructures, consisting of straight nanowires of ZnO with blunt faceted ends with a sudden reduction in diameter projecting out, were observed, having diameters of 30–60 nm and lengths of 2–4 μm. TEM analysis and SAED patterns showed that the as-grown nanostructures are highly crystalline in nature and preferably grown along the [0 0 0 1] direction, which is consistent with XRD analysis. Room-temperature photoluminescence (PL) measurements showed a reduced near band-edge emission in the UV region at 380 nm, while a strong deep level emission was observed in the visible region at 500–530 nm. A model for vapor–solid (VS) growth mechanism of ZnO nanowires was presented.
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