1998 Fiscal Year Final Research Report Summary
Preparation of Oxide Coating Films with Tailored Texture by the Sol-Gel Method
| Project/Area Number |
09450328
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
無機工業化学
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
MINAMI Tsutomu Osaka Prefecture Univ., Prof., 工学部, 教授 (80081313)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUDA Atsunori Osaka Prefecture Univ., Res.Assoc., 工学部, 助手 (70295723)
TADANAGA Kiyoharu Osaka Prefecture Univ., Res.Assoc., 工学部, 助手 (90244657)
TATSUMISAGO Masahiro Osaka Prefecture Univ., Prof., 工学部, 教授 (50137238)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Sol-gel method / Microtexture / Fine particle / Organic-inorganic hybrid / Electrophoretic sol-gel deposition / Thick film / Ferroelectric thin film / Transparent |
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| Research Abstract |
1. Organic-inorganic hybrid coating films, which were crack-free and flexible, were prepared using polyvinyltriethoxysilane and tetraethoxysilane by the sol-gel method on polyimide substrates.
2. Thick silica films were prepared on the cathode by the electrophoretic sol-gel deposition using a cationic polymer surfactant, polyethylenimine (PEI). When the content of PEI added was 0.01 mass% and pH of the coating sols was 5, the resultant thick silica films had no cracks and the thickness was ca. 20 *m.
3. YMnO_3 thin films being proposed as a new material for non volatile ferroelectric memory devices were prepared from ethanol solutions of Y(OAc)_3 and Mn(OAc)_2. The reflux process was found to drastically lower the firing temperature and improve the microstructure and dielecfric properties of the resultant films.
4. We have found that anatase nanocrystals with about 6 nm in diameter precipitated in sol-gel derived TiO_2-SiO_2 thin films after hot water treatment and that the addition of organic polymer accelerated the precipitation of anatase. This mild process enable us to form anatase nanocrystals- dispersed films on various kinds of substrates including organic polymer and organism of which heat resistance is poor.
5. Thick films were prepared on ITO-coated glass substrates by electrophoretic deposition using sols containing phenylsilsesquioxane (PhSiO_<3/2>) particles derived from phenyltriethoxysilane. Transparency of the thick PhSiO_<3/2> films was significantly improved by a heat-treatment at 400ﾟC.From SEM observation, the thick films were found to change in morphology from aggregates of particles with a number of open spaces among the particles to a monolith with no open spaces after the heat-treatment.
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