Hydrothermal Synthesis and Optical Properties of ZnO Nanostructured Films Directly Grown from/on Zinc Substrates
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- 作者：Yueping Fang ; Xiaogang Wen ; Shihe Yang ; Qi Pang ; Lu Ding ; Jiannong Wang and Weikun Ge
- 关键词：ZnO ; nanorods array ; nanoflowers film ; hydrothermal synthesis ; phtotoluminescence
- 刊名：Journal of Sol-Gel Science and Technology
- 出版年：2005
- 出版时间：2005
- 年：2005
- 卷：36
- 期：2
- 页码：227-234
- 全文大小：1.02 MB
文摘
Uniform ZnO nanorods arrays are grown directly from and on Zn foils in pure water under hydrothermal conditions at a relatively low temperature. The nanorods are 80–200 nm in diameter and ∼ 1 μm in length, which grow on the Zn foil along the [001] direction. By changing the pure water to a urea solution, a Zn compound ([Zn5(OH)6(CO3)2], a precursor of ZnO nanoflowers film, is created by self-assembly. The ZnO nanoflowers film can be easily obtained by heating the [Zn5(OH)6(CO3)2] compound in N2 at 350∘C for 5–6 hours. Possible growth processes of the ZnO nanorods arrays and the [Zn5(OH)6(CO3)2] nanoflowers are discussed. Photoluminescence properties of the as-prepared ZnO nanostructures have been measured. The ZnO nanorods array synthesized using our method has minimal defects so that only band-gap emission is observed. However, the ZnO nanoflowers film, obtained by heating the [Zn5(OH)6(CO3)2] nanoflower precursor in N2, is polycrystalline and displays strong defect-related emission.