Remarkable birefringence in a TiO2-SiO2 composite film with an aligned mesoporous structure

Hirokatsu Miyata, Yuta Fukushima, Kohei Okamoto, Masahiko Takahashi, Masatoshi Watanabe, Wataru Kubo, Atsushi Komoto, Shin Kitamura, Yosuke Kanno, Kazuyuki Kuroda

    Research output: Contribution to journalArticle

    37 Citations (Scopus)

    Abstract

    Mesoporous titania-silica composite films with highly aligned cylindrical pores are prepared by the sol-gel method using a substrate with structural anisotropy. The strong alignment effect of a rubbing-treated polyimide film on a substrate provides a narrow alignment distribution in the plane of the film regardless of the fast condensation rate of titania precursors. The collapse of the mesostructure upon the surfactant removal is effectively suppressed by the reinforcement of the pore walls with silica by exposing the as-deposited film to a vapor of a silicon alkoxide. The existence of a silica layer on the titania pore wall is proved from the distributions of Ti and Si estimated by the elemental analysis in high resolution electron microscopy. The obtained mesoporous titania-silica composite film exhibits a remarkable birefringence reflecting the highly anisotropic mesoporous structure and the high refractive index of titania that forms the pore wall. The δn value estimated from the optical retardation and the film thickness is larger than 0.06, which cannot be achieved with the conventional mesoporous silica films with uniaxially aligned mesoporous structure even though the alignment of the pores in the films is perfect. These inorganic films with mesoscopic structural anisotropy will find many applications in the field of optics as phase plates with high thermal/chemical/mechanical stabilities.

    Original languageEnglish
    Pages (from-to)13539-13544
    Number of pages6
    JournalJournal of the American Chemical Society
    Volume133
    Issue number34
    DOIs
    Publication statusPublished - 2011 Aug 31

    Fingerprint

    Birefringence
    Composite films
    Silicon Dioxide
    Titanium
    Silica
    Anisotropy
    Refractometry
    Polymethyl Methacrylate
    Silicon
    Surface-Active Agents
    Mechanical stability
    High resolution electron microscopy
    Chemical stability
    Substrates
    Electron Microscopy
    Polyimides
    Sol-gel process
    Hot Temperature
    Gels
    Film thickness

    ASJC Scopus subject areas

    • Chemistry(all)
    • Catalysis
    • Biochemistry
    • Colloid and Surface Chemistry

    Cite this

    Remarkable birefringence in a TiO2-SiO2 composite film with an aligned mesoporous structure. / Miyata, Hirokatsu; Fukushima, Yuta; Okamoto, Kohei; Takahashi, Masahiko; Watanabe, Masatoshi; Kubo, Wataru; Komoto, Atsushi; Kitamura, Shin; Kanno, Yosuke; Kuroda, Kazuyuki.

    In: Journal of the American Chemical Society, Vol. 133, No. 34, 31.08.2011, p. 13539-13544.

    Research output: Contribution to journalArticle

    Miyata, H, Fukushima, Y, Okamoto, K, Takahashi, M, Watanabe, M, Kubo, W, Komoto, A, Kitamura, S, Kanno, Y & Kuroda, K 2011, 'Remarkable birefringence in a TiO2-SiO2 composite film with an aligned mesoporous structure', Journal of the American Chemical Society, vol. 133, no. 34, pp. 13539-13544. https://doi.org/10.1021/ja204384m
    Miyata H, Fukushima Y, Okamoto K, Takahashi M, Watanabe M, Kubo W et al. Remarkable birefringence in a TiO2-SiO2 composite film with an aligned mesoporous structure. Journal of the American Chemical Society. 2011 Aug 31;133(34):13539-13544. https://doi.org/10.1021/ja204384m
    Miyata, Hirokatsu ; Fukushima, Yuta ; Okamoto, Kohei ; Takahashi, Masahiko ; Watanabe, Masatoshi ; Kubo, Wataru ; Komoto, Atsushi ; Kitamura, Shin ; Kanno, Yosuke ; Kuroda, Kazuyuki. / Remarkable birefringence in a TiO2-SiO2 composite film with an aligned mesoporous structure. In: Journal of the American Chemical Society. 2011 ; Vol. 133, No. 34. pp. 13539-13544.
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