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    Titania Nanofilms from Titanium Complex-Containing Polymer Langmuir-Blodgett Films

    Year: 2020

    Journal: Langmuir, Volume 36, SEP 8, page 10371–10378

    Authors: Yamamoto, S; Ono, A; Matsui, J; Hoshino, N; Akutagawa, T; Miyashita, T; Mitsuishi, M

    Organizations: JSPSMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT)Japan Society for the Promotion of Science [26810111, 16H04197]; MEXTMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT) [15H00719]; Murata Science Foundation; Ogasawara Foundation for the Promotion of Science and Engineering; IMRAM project

    This paper proposes a method of fabricating low-dimensional TiO2 nanofilms at room temperature under ambient pressure conditions. The titanium-containing polymer complex Tip(DDA/acac) was synthesized by reacting an amphiphilic copolymer (p(DDA/acac)) with a titanium complex. Its ultrathin films were prepared using the LangmuirBlodgett (LB) technique. The monolayer was found to be free from hydrolysis and cross-linking side reactions, even at the airwater interface. The transferred LB films (nanosheets) were oxidized by ultraviolet irradiation at room temperature. The photo-oxidized material has an amorphous and porous structure with subnanometer-scale controllability (0.18 nm per layer). Photocatalytic performance was demonstrated by converting multilayered LB films of Ti(DDA/acac) and the silicon-containing polymer p(DDA/SQ) into ultrathin hetero-multilayers of TiO2 and SiO2 under UVO3 treatment. The scalability affords a uniform photopattern formation of photo-oxidized TiO2 films over several hundreds of micrometers.
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