Pembentukan Cekung Berkualiti Tinggi Menggunakan Tempoh Penganodan yang Singkat bagi Penghasilan AAO

Abstract

The quality of the AAO membrane prepared using two-step anodization technique is strongly influenced by the pre-textured concave indented during the first-step of anodization. This work was conducted to determine the optimum duration of anodization to produce a high quality of concaves. The anodization process was conducted using 0.3 M H 2 C 2 O 4 solution as an electrolyte at 40 V and 18°C applied voltage and temperature, respectively. Anodizing process was performed up to 6 h. The changes of the current during anodization process was recorded. After removal of the resulting oxide layer, the concaves formed were studied using FESEM. FESEM micrograph confirmed the formation of a uniform hexagonal concaves. Beside improving the uniformity, the extension of anodizing duration formed a well-defined arrangement of concaves with minimum defects. This work found that the optimum period to obtain a uniform and perfect concaves is between 4 and 6 h. This is because the extension of anodizing period caused the wall to collapse and creating larger, irregular pores. In addition, the underlying mechanism for concave formation was described in detail.