Title :
Photoinduced wettability transition and electrowetting in hierarchical ZnO and TiO2 structures
Author :
Papadopoulou, E.L. ; Barberoglou, M. ; Manousaki, A. ; Stratakis, E. ; Fotakis, C.
Author_Institution :
Inst. of Electron. Struct. & Laser, Found. for Res. & Technol. Hellas (FORTH), Heraklion, Greece
Abstract :
This study deals with self cleaning surfaces, where the wetting properties are controlled by the different external stimuli. ZnO and TiO2 structures are fabricated by femtosecond laser irradiation of Si wafers and their subsequent coating with ZnO or TiO2 by pulsed laser deposition (PLD). In the present experiment, the ZnO surface is coated by a thin layer of hydrophobic and dielectric Teflon. The electrowetting properties of this surface are studied, as well as the wettability of the final surface, which can be controlled by an electric voltage application between a droplet situated on top of the dielectric conductive ZnO substrate.
Keywords :
II-VI semiconductors; coatings; dielectric materials; high-speed optical techniques; hydrophobicity; pulsed laser deposition; surface cleaning; surface structure; titanium compounds; wetting; wide band gap semiconductors; zinc compounds; Si wafers; TiO2; ZnO; conductive ZnO substrate; dielectric Teflon; dielectric ZnO substrate; droplet; electrowetting; femtosecond laser irradiation; hierarchical TiO2 structures; hierarchical ZnO structures; hydrophobic Teflon; photoinduced wettability transition; pulsed laser deposition; self cleaning surfaces; wetting properties; Laser theory; Laser transitions; Materials science and technology; Optical materials; Physics; Pulsed laser deposition; Rough surfaces; Surface emitting lasers; Surface roughness; Zinc oxide;
Conference_Titel :
Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-4079-5
Electronic_ISBN :
978-1-4244-4080-1
DOI :
10.1109/CLEOE-EQEC.2009.5192165
