Highly ordered self-organized TiO2 nanotube arrays prepared by a multi-step anodic oxidation process

Title
Highly ordered self-organized TiO2 nanotube arrays prepared by a multi-step anodic oxidation process
Authors
한승철도정만윤진국김긍호변지영한승희홍경태권숙인
Keywords
TiO2 nanotube; multi-step anodic oxidation; fluoride containing electrolyte
Issue Date
2009-06
Publisher
Metals and Materials International
Citation
VOL 15, NO 3, 493-499
Abstract
Highly ordered TiO2 nanotube arrays were prepared using a self-templating multi-step anodic oxidation process in a fluoride-containing electrolyte. The microstructures, chemical compositions, and phases of the self-organized TiO2 nanotube arrays were analyzed by FESEM, XPS, and XRD, respectively. Hexagonal packing density in TiO2 nanotube arrays significantly improved after the the multi-step anodic oxidation. The area densities of the hexagonal TiO2 nanotube arrays increased approximately 3 times from the first to second step in the anodic oxidation steps process (4.9 μm−2 to 16.4 μm−2 ), but there was no difference between the second and third step (16.4 μm−2 to 16.0 μm−2 ). The as-anodized TiO2 nanotube array had an amorphous structure and it transformed to an anatase phase during the annealing process at 450 °C for 1 h. The as-anodized TiO2 nanotube arrays adsorbed the fluoride, hydrocarbon groups (CH), hydroxyl groups (OH, C–OH), and carboxyl groups (O = C-OH) on their surfaces.
URI
http://pubs.kist.re.kr/handle/201004/35576
ISSN
1598-9623
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KIST Publication > Article
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