xxiii πανελληνιο ÏƒÏ Î½ÎµÎ´ÏÎ¹Î¿ Ï†Ï ÏƒÎ¹ÎºÎ·Ï‚ στερεας καταστασης & επιστημης ...

Light - induced Reversible Hydrophilicity of Hydrothermally grown TiO 2 films
D. Vernardou, 1,2,3* E. Stratakis, 3,8,9 G. Kenanakis, 1,2,4 H. M. Yates, 5 S. Couris, 6 M. E. Pemble, 7 E. Koudoumas 1,8 and N.
Katsarakis 1,2,9
1 Center of Materials Technology and Laser, School of Applied Technology, Technological Educational Institute of Crete,
710 04 Heraklion, Crete, Greece
2 Science Department, School of Applied Technology, Technological Educational Institute of Crete, 710 04 Heraklion, Crete,
Greece
3 Department of Materials Science and Technology, University of Crete, 710 03 Heraklion, Crete, Greece
4 Department of Chemistry, University of Crete, 710 03 Heraklion, Crete, Greece
5 Institute for Materials Research, University of Salford, Cockroft Building, Salford, Manchester, M5 4WT, UK
6 Institute of Chemical Engineering and High Temperature Chemical Processes (ICE-HT), Foundation for Research and
Technology-Hellas (FORTH), 26504 Patras, Greece and University of Patras, Department of Physics, 26504 Patras, Greece
7 Tyndall National institute, University College Cork, Lee Maltings, Prospect Row, Cork, Ireland
8 Electrical Engineering Department, Technological Educational Institute of Crete, 710 04 Heraklion, Crete, Greece
9 Institute of Electronic Structure and Laser, Foundation for Research & Technology-Hellas, P.O. Box 1527, Vassilika
Vouton, 711 10 Heraklion, Crete, Greece
*Dimitra Vernardou, e-mail: dimitra@iesl.forth.gr
Titanium (IV) oxide films were deposited on Corning glass by a hydrothermal growth technique, using titanium (IV)
isopropoxide, propanol and MilliQ water as precursors, for potential use as self–cleaning coatings. It is demonstrated that asdeposited
films grown at 95 o C, using solutions with 0.1 M MilliQ water, for a deposition time of 20 hr, exhibit the best
reversible hydrophilic response. For MilliQ water concentrations below 0.1 M, little or no growth was observed, while above
0.3 M, precipitation or even gelation rapidly occurred. The effects of the structural and morphological properties on the
hydrophilic response of the films are discussed in terms of the MilliQ water concentration present.
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