Hexagonal pore arrays with a 50-420 nm interpore distance formed by self-organization in anodic alumina
Hexagonal pore arrays with a 50-420 nm interpore distance formed by self-organization in anodic alumina
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DOI：
10.1063/1.368911
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发表时间：
1998-12-01
影响因子：
3.2
通讯作者：
Gosele, U
中科院分区：
文献类型：
--
作者：
Li, AP;Muller, F;Gosele, U
通过在草酸、硫酸和磷酸溶液中对铝进行阳极氧化，获得了阳极氧化铝中孔距为 50-420 nm 的自组织六边形孔阵列。在磷酸中恒定阳极电位下获得了距离达 420 nm 的六角形有序孔阵列。通过比较三种电解质中的有序孔隙形成情况，发现有序孔隙阵列呈现出尺寸为几微米的多晶结构。孔间距离随阳极电位线性增加，从无序多孔阳极氧化铝获得的关系也适合周期性孔排列。当铝在氧化过程中的体积膨胀约为 1.4（与电解质无关）时，可以观察到最佳有序的周期排列。有序阵列的形成机制与先前提出的机械应力模型一致，即。即，金属/氧化物界面处相邻孔之间的排斥力促进氧化过程中六边形有序孔的形成。 (C) 1998 年美国物理研究所。 [S0021-8979(98)00423-X]
Self-organized hexagonal pore arrays with a 50-420 nm interpore distance in anodic alumina have been obtained by anodizing aluminum in oxalic, sulfuric, and phosphoric acid solutions. Hexagonally ordered pore arrays with distances as large as 420 nm were obtained under a constant anodic potential in phosphoric acid. By comparison of the ordered pore formation in the three types of electrolyte, it was found that the ordered pore arrays show a polycrystalline structure of a few micrometers in size. The interpore distance increases linearly with anodic potential, and the relationship obtained from disordered porous anodic alumina also fits for periodic pore arrangements. The best ordered periodic arrangements are observed when the volume expansion of the aluminum during oxidation is about 1.4 which is independent of the electrolyte. The formation mechanism of ordered arrays is consistent with a previously proposed mechanical stress model, i. e., the repulsive forces between neighboring pores at the metal/oxide interface promote the formation of hexagonally ordered pores during the oxidation process. (C) 1998 American Institute of Physics. [S0021-8979(98)00423-X]