Abstract
The influence of manganese content on the formation of well-ordered porous anodic alumina was studied. Porous anodic alumina has been produced on aluminium substrate of different manganese content by single-step anodizing at 50 V in 0.3 M oxalic acid at 15°C for 60 minutes. The well-ordered pore and cell structure was revealed by subjecting the porous anodic alumina to oxide dissolution treatment in a mixture of chromic acid and phosphoric acid. It was found that the manganese content above 1 wt% impaired the regularity of the cell and pore structure significantly, which can be attributed to the presence of secondary phases in the starting material with manganese content above 1 wt%. The pore diameter and interpore distance decreased with the addition of manganese into the substrates. The time variation of current density and the thickness of porous anodic alumina also decreased as a function of the manganese content in the substrates.
Highlights
Porous anodic alumina (PAA) is a self-organizing porous material
PAA is a suitable template for the synthesis of nanostructured materials because its cell parameters such as pore diameter, interpore distance, and pore depth can be controlled by varying anodizing conditions [7, 8]
We report a comparative study of the characteristic parameters of well-ordered PAA fabricated from high-purity aluminium (99.99%) and Al-Mn alloy under the same operating conditions
Summary
Porous anodic alumina (PAA) is a self-organizing porous material. After the confirmation of the classical cell model proposed by Keller et al [1], PAA has attracted enormous attraction as inexpensive template for the fabrication of various nanostructured materials without the need of costly and complex lithographic techniques [2,3,4,5,6]. PAA is a suitable template for the synthesis of nanostructured materials because its cell parameters such as pore diameter, interpore distance, and pore depth can be controlled by varying anodizing conditions [7, 8]. The fabrication of nanostructured materials by template synthesis method employs wellordered PAA because well-ordered PAA provides regular pore shape and narrow distribution of specific pore diameter and interpore distance for the synthesis of nanostructured materials of uniform dimensions. Well-ordered PAA was realized by Masuda and Fukuda in 1995 [11] They employed a twostep anodizing method for the synthesis of well-ordered PAA
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