Structural and dielectric properties of monodisperse TiO$_{2}$-paraffin core-shell nanoparticles

ORAL

Abstract

Core-shell nanoparticles made of oxides having high dielectric constant and organic materials with large breakdown field are attractive candidates for higher-energy-density capacitors. In the present study, monodispersed TiO$_{2 }$nanoparticles were produced using a cluster-deposition method and subsequently coated with uniform paraffin nanoshells using an \textit{in-situ} thermal evaporation to form core-shell structure. The thickness of the paraffin nanoshells was varied by controlling the evaporation temperature of paraffin. The dielectric properties of TiO$_{2}$-paraffin core-shell nanoparticles show an enhanced effective dielectric constant with a decrease in the thickness of the nanoshells and also, reveal a minimum dielectric dispersion and low dielectric losses in the frequency range of 100 Hz -- 1MHz, which are highly desirable for potential device applications.

*This research is supported by ONR (Grant No: N00014-06-1-0604), NSF - MRSEC (Grant No: DMR-0820521) and NCMN.

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Authors

  • Balasubramanian Balamurugan

    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588.

  • Kristin Kraemer

    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588.

  • Ralph Skomski

    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588.
    • University of Nebraska, Lincoln
    • Department of Physics and Astronomy \& NCMN, University of Nebraska, Lincoln, NE 68588
    • Dept. Phys. \& Astr. and NCMN, University of Nebraska

  • S. Ducharme

    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588.
    • Department of Physics \& Astronomy \& Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE-68588

  • David Sellmyer

    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588.