Fast Fabrication of Highly Ordered Porous Anodic Alumina Membranes by Hard-mild Anodization

doi:10.3724/SP.J.1077.2014.13525

Abstract

Abstract:

A hard-mild anodization combined method (HA-MA) for rapidly fabricating highly ordered porous anodic alumina (PAA) membranes is presented in this paper. Firstly, by using hard-anodization (HA), the ordered pit arrays on aluminum surface were rapidly prepared and then, by using mild anodization (MA), ordered PAA membranes were fabricated on the ordered pit arrays aluminum surface. The effect of HA parameters, such as anodization voltage and duration, on the order degree of as-fabricated PAA membranes were investigated. The results showed that the optimum HA voltage and duration in 0.3 mol/L sulfuric acid at -1.5℃ were 80 V and 10 min, respectively. The order degree and mechanical stability of as-fabricated PAA membranes were similar to that of PAA membranes fabricated by two-step MA method, but its total process duration was within 4.5 h, which cost only about 1/4 time as that of by two-step MA method, The HA-MA method greatly improved the fabrication efficiency of ordered PAA.

Key words: porous anodic alumina, mild anodization, hard anodization, hard-mild combined method

CLC Number:

O611

HAO Ai-Wen, HUANG Li-Qing, CHENG Long, Li Xin, ZHANG Wei-Wei, SHAN Dong-Zhi, FENG Xue-Hong. Fast Fabrication of Highly Ordered Porous Anodic Alumina Membranes by Hard-mild Anodization[J]. Journal of Inorganic Materials, 2014, 29(6): 645-649.

Figures/Tables 5

Fig. 1 Current-time transients during HA of aluminium substrates in 0.3 mol/L H2SO4 (-1.5?C) at UH=60, 70 and 80 V, respectively

Fig. 2 SEM images of bottom surface and dependence of Dint on the anodization voltage UH for PAA which was fabricated by HA for 30 min in 0.3 mol/L H2SO4 (-1.5℃) at various anodization voltage UH (Insets show the FFT image of corresponding membrane) (a) SEM image of PAA fabricated at UH=60 V; (b) SEM image of PAA fabricated at UH=70 V; (c) SEM image of PAA fabricated at UH=80 V; (d) Dependence of Dint on the anodization voltage UH for fabricated PAA

Fig. 3 SEM images of PAA bottom surface fabricated by HA in 0.3 mol/L H2SO4 (-1.5℃) at UH= 80 VI (Inset shows the FFT image of corresponding membrane) (a) SEM image of PAA fabricated at tH = 25 min; (b) SEM image of PAA fabricated at tH = 20 min; (c) SEM image of PAA fabricated at tH =15 min; (d) SEM image of PAA fabricated at tH=10 min

Fig. 4 Dependence of current density IA and Dint of fabricated PAA on anodization time tH for HA in 0.3 mol/L H2SO4 (-1.5℃) at UH= 80 V

Fig. 5 SEM images of top and bottom surfaces of PAA fabricated by HA-MA and MA, respectively. The inset shows the FFT image of corresponding SEM image (a) Top and (b) bottom surfaces of PAA fabricated by HA-MA with optimum HA parameters; (c) Top and (d) bottom surfaces of PAA fabricated by HA-MA with non-optimum HA parameters; (e) Top and (f) bottom surfaces of PAA fabricated by two step MA

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