Laser-induced formation of photocatalytic TiO2 micro networks on a UV-absorbing glass surface

Aiko Narazaki; Yoshizo Kawaguchi; Hiroyuki Niino; Masanori Shojiya; Hirotaka Koyo; Keiji Tsunetomo

doi:10.1117/12.698264

20 March 2007 Laser-induced formation of photocatalytic TiO₂ micro networks on a UV-absorbing glass surface

Aiko Narazaki, Yoshizo Kawaguchi, Hiroyuki Niino, Masanori Shojiya, Hirotaka Koyo, Keiji Tsunetomo

Proceedings Volume 6459, Laser-based Micro- and Nanopackaging and Assembly; 64590Q (2007) https://doi.org/10.1117/12.698264
Event: Lasers and Applications in Science and Engineering, 2007, San Jose, California, United States

Abstract

Laser-induced formation of functional materials from glasses has a great potential for creation of monolithic and high-performance glass-based devices, such as optical circuit and micro-TAS. We have recently developed a laser-induced formation technique of photocatalytic titanium oxide on a UV-absorbing TiO₂-SiO₂- based glass surface by excimer laser irradiation under a specific condition, which we term laser-induced superficial phase separation. The laser-induced structure has the shape of micro-cones, growing into micro-sized network after accumulating laser pulses, which we call TiO₂ micronetwork. The TiO₂ micronetwork exhibited the rutile crystalline phase and photocatalytic ability. Moreover, the crystalline phase can be controlled from the rutile to the anatase by post-treatments. Utilizing this technique, we were able to make a site-selective growth of TiO₂ micronetworks: a microwell array and a microchannel modified with the TiO₂ network only on the bottom. This flexible formation of photocatalytic TiO₂ onto a glass surface without any heat-treatments and/or adhesives opens a new way to develop a monolithic glass device like micro-fluidics with light-catalyzed reactions.

Citation Download Citation

Aiko Narazaki, Yoshizo Kawaguchi, Hiroyuki Niino, Masanori Shojiya, Hirotaka Koyo, and Keiji Tsunetomo "Laser-induced formation of photocatalytic TiO₂ micro networks on a UV-absorbing glass surface", Proc. SPIE 6459, Laser-based Micro- and Nanopackaging and Assembly, 64590Q (20 March 2007); https://doi.org/10.1117/12.698264

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