利用磷酸溶液浸渍具有独特的六边形结构和组成的多孔型阳极氧化铝(PAAO), 获得了带状、棒状、管状等不同形貌的纳米氧化铝纤维. 用扫描电镜(SEM)、能谱仪和透射电镜(TEM)等手段对其形貌和组成进行了分析. 结果表明, 纳米氧化铝纤维是在阳极氧化铝的多孔层形成的, 且在浸渍过程中阻挡层和多孔层表现出完全不同的溶解趋势. PAAO孔壁的特殊结构和组成上的差异造成的择优溶解是不同形貌纳米氧化铝纤维形成的主要原因.
Based on PAAO's unique cellular hexagon morphology and composition, various alumina fibers (nano-belts, nano-rods, and nano-tubes) were fabricated by simply employing a dilute acid etching method. Scanning electron microscope (SEM) incorporated with energy dispersive X-ray spectroscope (EDS) and transmission electron microscope (TEM) were applied to characterize these nano-fibers. It is proved that alumina nano-fibers are formed from the porous layer, while totally different behaviors of the barrier layer and the porous layer are showed during the etching process. The orientated etching, resulted from PAAO's particular morphology and composition, is believed to be the main reason that explains the formation of different alumina nano-fibers.
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