Super-hydrophilic and transparent thin films of TiO2 nanotube arrays by a hydrothermal reaction

被引:88
作者
Miyauchi, Masahiro
Tokudome, Hiromasa
机构
[1] Natl Inst Adv Ind Sci & Technol, Nanotechnol Res Inst, Tsukuba, Ibaraki 3058565, Japan
[2] TOTO Ltd, Res Inst, Kanagawa 2538577, Japan
关键词
D O I
10.1039/b700387k
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Titanate nanotube arrays were grown on sapphire substrates by sputtering deposition of titanium films and a subsequent hydrothermal treatment in an aqueous NaOH solution. Post annealing in air transformed the crystals from a titanate structure to an anatase structure. Titanate and anatase nanotube arrays were optically transparent and adhered well to the substrates. Both titanate and anatase nanotube films exhibited high-hydrophilic states with water contact angles below 5 degrees even after dark storage for more than three months due to their surface nanostructures. UV illumination caused super-hydrophilic states with 0 degrees water contact angles, i.e. band-gap excitations decreased the initial water contact angles in dark conditions (similar to 3.5 degrees) to 0 degrees. The hydrophilicizing rate of the anatase nanotubes was faster than that of the titanate nanotubes because the anatase nanotubes had a higher crystallinity and more absorbed photons.
引用
收藏
页码:2095 / 2100
页数:6
相关论文
共 68 条
[1]   Formation of titania nanotubes and applications for dye-sensitized solar cells [J].
Adachi, M ;
Murata, Y ;
Okada, I ;
Yoshikawa, S .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2003, 150 (08) :G488-G493
[2]   TiO2-B nanowires [J].
Armstrong, AR ;
Armstrong, G ;
Canales, J ;
Bruce, PG .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2004, 43 (17) :2286-2288
[3]   Wetting behaviour of layers of TiO2 nanotubes with different diameters [J].
Balaur, E ;
Macak, JM ;
Tsuchiya, H ;
Schmuki, P .
JOURNAL OF MATERIALS CHEMISTRY, 2005, 15 (42) :4488-4491
[4]   Protonated titanates and TiO2 nanostructured materials:: Synthesis, properties, and applications [J].
Bavykin, Dmitry V. ;
Friedrich, Jens M. ;
Walsh, Frank C. .
ADVANCED MATERIALS, 2006, 18 (21) :2807-2824
[5]   Reversible storage of molecular hydrogen by sorption into multilayered TiO2 nanotubes [J].
Bavykin, DV ;
Lapkin, AA ;
Plucinski, PK ;
Friedrich, JM ;
Walsh, FC .
JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (41) :19422-19427
[6]   The effect of hydrothermal conditions on the mesoporous structure of TiO2 nanotubes [J].
Bavykin, DV ;
Parmon, VN ;
Lapkin, AA ;
Walsh, FC .
JOURNAL OF MATERIALS CHEMISTRY, 2004, 14 (22) :3370-3377
[7]   Apparent two-dimensional behavior of TiO2 nanotubes revealed by light absorption and luminescence [J].
Bavykin, DV ;
Gordeev, SN ;
Moskalenko, AV ;
Lapkin, AA ;
Walsh, FC .
JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (18) :8565-8569
[8]  
Chen Q, 2002, ADV MATER, V14, P1208, DOI 10.1002/1521-4095(20020903)14:17<1208::AID-ADMA1208>3.0.CO
[9]  
2-0
[10]  
Chu SZ, 2002, ADV MATER, V14, P1752, DOI 10.1002/1521-4095(20021203)14:23<1752::AID-ADMA1752>3.0.CO