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Citation: ZHANG Lu, YAO Su-wei, ZHANG Wei-guo, WANG Hong-zhi. Preparation and Formation Mechanism of Alumina Nanowires[J]. Acta Physico-Chimica Sinica, ;2005, 21(11): 1254-1258. doi: 10.3866/PKU.WHXB20051112 shu

Preparation and Formation Mechanism of Alumina Nanowires

1.
SUGIYAMA Laboratory of Surface Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072

Received Date: 21 March 2005
Available Online: 15 November 2005

The highly ordered anodic aluminum oxide (AAO) film, was prepared with electrochemical anodization method. The as-synthesized AAO film was amorphous as seen from XRD result. Amorphous alumina nanowires were successfully and easily obtained with high yield by etching AAO films in a mixture of H₃PO₄ and H₂CrO₄, NaOH, HCl, or H₃PO₄ solutions. The AAO film annealed at 800 ℃ for 4 h turned to γ-Al₂O₃. γ-Al₂O₃alumina nanowires were also obtained with high yield by etching γ-Al₂O₃ AAO film. Effects of the type of etching solutions, the etching time and the crystalline structure of AAO film on the preparation of alumina nanowire were carefully investigated. And the morphology and structure of alumina nanowires were studied by SEM, TEM and XRD. The results showed that in many kinds of solutions the alumina nanowire could be fabricated by etching method. The length (L) of the nanowire would increase and the diameter (D) would decrease when the etching time became longer, but the ratio of L /D would increase. The crystalline structure of the alumina nanowire was in accordance with that of the AAO film. Furthermore, the morphology of the AAO film was characterized by atomic force microscope (AFM) and SEM in detail. On the basis of AFM and SEM observations, a possible formation mechanism of the alumina nanowire was discussed, and the plum bloom-shape microstructure of the AAO film was considered to be the essential factor deciding the formation of the alumina nanowire.
- Anodic aluminum oxide film;Etching method;Alumina nanowire; Formation mechanism
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