Abstract
We present detailed information on the fabrication of free-standing ultrathin porousalumina membranes (PAMs) with controllable thickness of 100–1000 nm. The mechanism ofthe ultrathin PAM formation has been revealed by a combination study of current–timecharacteristics and microstructure images. At the beginning of the anodization, V-shapenanopores can be observed due to the alumina formation in both the sidewalls and thebarrier layers. As a result of the applied electric field effect, part of the alumina in thesidewalls is dissolved, the nanopores gradually become regularly U-shape and finally growsteadily. Ultrathin PAMs with controllable thickness and morphology have beenrealized by changing the anodization time and the current density. Furthermore, animproved method has been demonstrated to obtain free-standing ultrathin PAMs byremoving unoxided aluminium through a nontoxic mixture solution of saturatedCuSO4 and HCl.
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