20 March 2007 Laser-induced formation of photocatalytic TiO2 micro networks on a UV-absorbing glass surface
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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.
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Aiko Narazaki, Aiko Narazaki, Yoshizo Kawaguchi, Yoshizo Kawaguchi, Hiroyuki Niino, Hiroyuki Niino, Masanori Shojiya, Masanori Shojiya, Hirotaka Koyo, Hirotaka Koyo, Keiji Tsunetomo, 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); doi: 10.1117/12.698264; https://doi.org/10.1117/12.698264

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