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The Growth of Porous ZnO Nanowires by Thermal Oxidation of ZnS Nanowires

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The growth of porous ZnO nanowires (NWs) via phase transformation of ZnS NWs at 500–850 °C in air was studied. The ZnS NWs were first synthesized by thermal evaporation of ZnS powder at 1100 °C in Ar. On subsequent annealing at 500 °C in air, discrete ZnO epilayers formed on the surface of ZnS NWs. At 600 °C, polycrystalline ZnO and the crack along the (0001) interface between the ZnO epilayer and ZnS NW were observed. At 700–750 °C ZnS NWs transformed to ZnO NWs, meanwhile nanopores and interfacial cracks were observed in the ZnO NWs. Two factors, the evaporation of SO2 and SO3 and the stress induced by the incompatible structure at the interface of ZnO epilayer and ZnS NW, can be responsible for the formation of porous ZnO NWs from ZnS NW templates on annealing at 700–750 °C in air. Rapid growth of ZnO at 850 °C could heal the pores and cracks and thus resulted in the well-crystallized ZnO NWs.
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Document Type: Research Article

Publication date: 2011-12-01

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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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