Effect of electrolyte temperature on the formation of highly ordered nanoporous alumina template

Sellarajan, B and Sharma, Megha and Ghosh, SK and Nagaraja, HS and Barshilia, Harish C and Chowdhury, P (2016) Effect of electrolyte temperature on the formation of highly ordered nanoporous alumina template. Microporous and Mesoporous Materials, 224. pp. 262-270. ISSN 13871811

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In this work, we present a systematic influence of electrolyte temperature along with anodizing potential on the pore parameters during two-step anodization of Al in H2SO4 electrolyte. Top surface morphology of the nanoporous templates was examined with the help of field emission scanning electron microscope and atomic force microscope. Three-dimensional (3D) Fast Fourier Transform (FFT) image analysis was then employed to quantify pore regularity and pore periodicity as a function of both the bath temperature (1–15 °C) and the anodic potential (15–25 V). A highest pore regularity ratio of 5 × 108 was obtained at 3 °C and 25 V with a pore diameter of 32 ± 3 nm and inter-pore distance of 65 nm. With further increase in temperature, the pore regularity ratio was found to decrease drastically. It was found that higher temperature favored the dissolution of compact aluminum oxide layer isotropically along the pore length. This process in effect enhanced the pore size, growth rate, and template top surface roughness without affecting much inter-pore distance. Self-ordering of the pores was found to improve with increasing anodizing potential with a critical influence of the current density along with inter-pore distance. The mechanism of pore growth was discussed in terms of temperature-dependent activation energy controlled dissolution of aluminum. The typical activation energy evaluated at 25 V was 72.8 kJ/mol at 3 °C.

Item Type: Article
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Mrs SK Pratibha
Date Deposited: 25 Jul 2019 11:31
Last Modified: 25 Jul 2019 11:31
URI: http://nal-ir.nal.res.in/id/eprint/12964

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