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Preparation of Porous Anodic Alumina Membranes

CHEN Hong;ZHANG Jinxi;TANG Xiuhua;School of Material and Chemical Engineering,Sichuan University of Science & Engineering;  
By two-step anodic oxidation method,the highly ordered porous alumina membrane(PAA) is prepared from aluminium,and the complete and independent porous alumina template is detached by transient pulse method from the aluminum base.Then its suiface is analyzed by scanning electron microscope.The results show that the PAA film can be detached completely by transient pulse method,what's more,the quality of the film is very good.The hole diameter is 40~50 nm,holes' interval is 90~105 nm,the thickness of film is about 25 μm,and the density of holes is up to 1.34×10~(10)个/cm~2.The contrast of the time-current densities curves of four times anodic oxidation shows that two-step anodic oxidation can produce highly ordered porous alumina membrane.
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