A METHOD OF MANUFACTURING A SELF-ORDERED POROUS STRUCTURE OF ALUMINIUM OXIDE, A NANOPOROUS ARTICLE AND A NANO OBJECT

摘要

An oxalic acid based anodization process for long-range ordered alu¬ mina membranes has been developed, which can readily be implemented in nanotechnology as well as in industry. The process is a generation of the so-called "hard anodization (HA)" that has widely been employed in industry for high-speed fabrication of mechanically robust, very thick ( 100 µm) and low-porosity anodic alumina films since the 1960s. The anodization process comprises forming a layer of ALSUB2/SUBOSUB3/SUB by anodization on a piece of aluminium and further applying a potential difference within the range 110V to 150V between the anodized piece of aluminium and a cathode. It offers big advantages over conventional anodization processes for nanoporous alumina membranes in terms of processing time, enabling 2500-3500% faster oxide growth with improved ordering of the nanopores. Perfectly ordered anodic alumina membranes on a cn?scale with a high aspect ratio (1000) of uniform nanopores with periodically modulated diameters have been realized by this new anodization process.