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Growth Mechanism for ZnO Nanorod Array in a Metastable Supersaturation Solution

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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 [002] 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: February 1, 2009

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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