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Seeded Growth of Titania Colloids with Refractive Index Tunability and Fluorophore-Free Luminescence

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    Colloids: Surfactants and Self-Assembly, Dispersions, Emulsions, Foams

    Seeded Growth of Titania Colloids with Refractive Index Tunability and Fluorophore-Free Luminescence
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    † Soft Condensed Matter, Debye Institute for Nanomaterials Science, Department of Physics and Astronomy, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
    ‡ Nanomechanics Group, Biotechnology Center, TU Dresden, Tatzberg 47-51, 01307 Dresden, Germany
    *To whom correspondence should be addressed. A.F. Demirörs: [email protected]. A. van Blaaderen: [email protected]
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    Langmuir

    Cite this: Langmuir 2011, 27, 5, 1626–1634
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    https://doi.org/10.1021/la103717m
    Published January 10, 2011
    Copyright © 2011 American Chemical Society
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    Abstract

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    Titania is an important material in modern materials science, chemistry, and physics because of its special catalytic, electric, and optical properties. Here, we describe a novel method to synthesize colloidal particles with a crystalline titania, anatase core and an amorphous titania-shell structure. We demonstrate seeded growth of titania onto titania particles with accurate particle size tunability. The monodispersity is improved to such an extent so that colloidal crystallization of the grown microspheres becomes feasible. Furthermore, seeded growth provides separate manipulation of the core and shell. We tuned the refractive index of the amorphous shell between 1.55 and 2.3. In addition, the particles show luminescence when trace amounts of aminopropyl-triethoxysilane are incorporated into the titania matrix and are calcined at 450 °C. Our novel colloids may be useful for optical materials and technologies such as photonic crystals and optical trapping.

    Copyright © 2011 American Chemical Society

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    Supporting Information

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    SLS curves for the titania particles studied by means of digital holographic microscopy (Figure S1), diameter from TEM and SLS of the particles in Figure S1 (Table S1), SLS experimental curves of the titania particles fitted to different theoretical calculations (Figure S2), and confocal fluorescence microscopy image of a mixture of FITC labeled silica particles and APS incorporated and calcined titania particles (Figure S3). This material is available free of charge via the Internet at http://pubs.acs.org.

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    Langmuir

    Cite this: Langmuir 2011, 27, 5, 1626–1634
    Click to copy citationCitation copied!
    https://doi.org/10.1021/la103717m
    Published January 10, 2011
    Copyright © 2011 American Chemical Society
    Request reuse permissions

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