Abstract
ZnO nanowires were grown on Si(001) substrates by catalyst-free thermal evaporation ofZnO powders in a lateral quartz tube without using a carrier gas. In the first phase of thevapour deposition process, film-like structures were formed on the substrate surface inthree-dimensional island growth mode and then rod-like nanostructures nucleated at thevertices of these ZnO islands. The rod-like structures grew further into slender needle-likestructures that finally evolved into straight hexagonal prismatic ZnO nanowires havingc-axis oriented single-crystalline wurtzite structure. Morphological evolution of the ZnOnanostructures accompanied improvement in the crystal qualities as reflected in theemission characteristics investigated by photoluminescence (PL) spectroscopy, whereintensified near-band-edge (NBE) emission was observed as compared with previouslyreported cases.
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