用AFM研究阳极氧化铝的不稳定生长

用原子力显微镜(AFM)研究了多孔阳极氧化铝(AAO)模板的不稳定生长. 结果表明:AAO模板的不稳定生长导致了纳米孔道结构有序度的降低.在H₃PO₄溶液中生长的AAO模板孔道结构稳定性较差;而在H₂C₂O₄溶液中生长的AAO模板稳定性依赖于氧化电压和电流密度,在低电压和电流密度下稳定性较好,高电压和电流密度下稳定性较差. 充分利用这种不稳定生长特性,通过控制AAO模板的阳极氧化条件,可得到具有分枝孔道结构的特殊模板,这为利用模板法制备各种Y形或T形纳米线、管提供了新的发展空间.

Unstable Growth of Anodic Aluminum Oxide Investigated by AFM

Atomic force microscope (AFM) was utilized to investigate the unstable growth of porous anodic aluminum oxide (AAO) membrane. The results showed that the unstable growth of AAO membrane resulted in the decrease of the order degree of its special nano-channels. The AAO membrane growing in H 3PO 4 solution is unstable, while the growth stability in H 2C 2O 4 solution will depend on its anodized voltage and current density: stable in low voltage and low current density while unstable in high voltage and high current density. By controlling the condition of the anodized process, the special AAO template with branched channel structures can be formed because of the unstable growth of the membrane. This may provide a new opportunity for fabricating Y-shape or T-shape nanowires and nanotubes by using the template method.