Growth Mechanism for ZnO Nanorod Array in a Metastable Supersaturation Solution
ZnO nanorod array with vertical orientation was fabricated by a simple aqueous solution way in the mild condition. ZnO granular film coated on glass substrate was used as a seeds film for the growth of ZnO ordered array. A metastable supersaturation area where there was no homogeneous nucleation of ZnO in the bulk solution but heterogeneous nucleation on the ZnO granular film was found. It was proved that high-quality and dense ZnO nanorod array could be obtained under this condition. The microstructures of ZnO nanorod array were characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM) equipped with energy dispersive spectrometer (EDS). The results indicated that ZnO nanorod array nucleated and grew vertically on the ZnO granular film along the  direction. The diameter and length of ZnO rod was greatly affected by growth solution concentration, reaction temperature, and metastable supersaturation status. The growth mechanism was discussed in detail.
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Document Type: Research Article
Publication date: 2009-02-01
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