Microspheres with Tunable Refractive Index by Controlled Assembly of Nanoparticles

Authors

  • Shin-Hyun Kim,

    1. National Creative Research Initiative Center for Integrated Optofluidic Systems Korea Advanced Institute of Science and Technology Daejeon, 305-701 (Korea)
    2. Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology Daejeon, 305-701 (Korea)
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  • Young-Sang Cho,

    1. National Creative Research Initiative Center for Integrated Optofluidic Systems Korea Advanced Institute of Science and Technology Daejeon, 305-701 (Korea)
    2. Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology Daejeon, 305-701 (Korea)
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  • Seog-Jin Jeon,

    1. National Creative Research Initiative Center for Integrated Optofluidic Systems Korea Advanced Institute of Science and Technology Daejeon, 305-701 (Korea)
    2. Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology Daejeon, 305-701 (Korea)
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  • Tai Hee Eun,

    1. National Creative Research Initiative Center for Integrated Optofluidic Systems Korea Advanced Institute of Science and Technology Daejeon, 305-701 (Korea)
    2. Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology Daejeon, 305-701 (Korea)
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  • Gi-Ra Yi,

    1. Nano Bio System Research Team Korea Basic Science Institute Seoul, 136-713 (Korea)
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  • Seung-Man Yang

    Corresponding author
    1. National Creative Research Initiative Center for Integrated Optofluidic Systems Korea Advanced Institute of Science and Technology Daejeon, 305-701 (Korea)
    2. Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology Daejeon, 305-701 (Korea)
    • National Creative Research Initiative Center for Integrated Optofluidic Systems Korea Advanced Institute of Science and Technology Daejeon, 305-701 (Korea).
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  • This work was supported by a grant from the Creative Research Initiative Program of the Ministry of Education, Science & Technology for “Complementary Hybridization of Optical and Fluidic Devices for Integrated Optofluidic Systems.” The authors also appreciate partial support from the Brain Korea 21 Program. Supporting Information is available online from Wiley InterScience or from the authors.

Abstract

original image

Microspheres with tunable functional properties are prepared by controlled aggregation of nanoparticles in emulsion droplets. In particular, complex rutile-phase morphologies are obtained by heat treatment of anatase titania aggregates. The refractive index of the microspheres can be modulated by using mixtures of silica and titania suspensions. In addition, dye doping is achieved by simply adding dye molecules into the titania suspension.

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