tailieunhanh - Báo cáo hóa học: " Experimental investigation on the bi-directional growing mechanism of the foils laminate approach in AAO fabrication"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Experimental investigation on the bi-directional growing mechanism of the foils laminate approach in AAO fabrication | Nanoscale Res Lett 2007 2 49-53 DOI S11671-006-9029-1 NANO EXPRESS Experimental investigation on the bi-directional growing mechanism of the foils laminate approach in AAO fabrication Jen-Yi Fan Ming-Chun Chien Gou-Jen Wang Received 4 August 2006 Accepted 23 October 2006 Published online 28 November 2006 to the authors 2006 Abstract The foils laminate approach can be implemented to grow bi-directional porous pattern from both the top and bottom surfaces of an aluminum foil. It was intuitively inferred that leakage of etchant from the clamped area can be a feasible cause to have the upward pores grow in the notches of the unpolished surface. This leakage hypothesis has been disproved by the leakage blocking and triple layers laminate experiments. It is further inferred that the non-uniformity of the thickness or material properties of the aluminum foil causes nonuniformed anodization rate along the sample surface. The fast oxidized areas create a pathway for leakage such that a shorter porous array from the back side is observed. Experiments with the process time being reduced by two hours validate this inference Keywords Anodic aluminum oxide Foils laminate approach Non-uniformed anodization Introduction Anodic aluminum oxide AAO membrane having nano-size porous array of regular hexagonal-shaped cells with straight columnar channels has been widely used as the template in fabricating one-dimensional nano materials which have controllable orientation . Fan . Wang El Department of Mechanical Engineering National Chung-Hsing University Taichung 40227 Taiwan e-mail gjwang@ . Chien Department of Electronic Engineering Chung Chou Institute of Technology Yuan-lin 510 Taiwan 1-5 . However applications of an unpatterned AAO membrane are restricted due to its densely packed pores. The recent focuses of the AAO techniques have been on growing desired patterns on the porous array 6-10 . Wang and Peng 11 developed a laminate foils approach