The effect of the current pulse amplitude on the nanopore structures of 3D-AAO films
| Autor: | Xinjian Xie, Tian Lan, Qin Xu, Lu Zhang, Meiyu Dong, Qi Peng, Chunxin Sun |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Nanostructure
Materials science Anodizing business.industry Scanning electron microscope Nanowire 02 engineering and technology General Chemistry Sawtooth wave 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences 0104 chemical sciences Nanopore Amplitude Mechanics of Materials Optoelectronics General Materials Science 0210 nano-technology business |
| Zdroj: | Microporous and Mesoporous Materials. 309:110575 |
| ISSN: | 1387-1811 |
| Popis: | The microstructure of porous anodic aluminum oxide (AAO) has a crucial influence on its properties. In this paper, three-dimensional AAO (3D-AAO) film with mallet-shaped nanopores structure and 185–187 nm pore diameters was prepared by periodic pulse anodizing of high-purity aluminum foil in phosphoric acid using asymmetric sawtooth current waves. Highly ordered 3D-AAO membranes with periodically modulated nanostructure were achieved, and the nanopores were changed from mallet shape to Y-branched channels with a length of 249–742 nm by adjusting the amplitude of the asymmetric sawtooth current wave. The effect of current amplitude on the nanostructure of 3D-AAOs was analyzed by combining the scanning electron micrograph (SEM) of the samples and the V-T images during the anodization process. The results show that the anodization time of the high-potential anodization stage and the low-potential anodization stage in each cycle can be adjusted by changing the amplitude of the asymmetric sawtooth current wave, to realize the regulation of the 3D-AAO nanostructure. These 3D-AAO film with structural modulation may be used as templates for the fabrication of novel nanowires or nanotubes with excellent electromagnetic properties. |
| Databáze: | OpenAIRE |
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