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Broad-spectrum enhancement of polymer composite dielectric constant at ultra low volume fractions of silica-supported copper nanoparticles

  • A new strategy for the synthesis of high permittivity polymer composites is demonstrated based on well-defined spatial distribution of ultralow amounts of conductive nanoparticles. The spatial distribution Was realized by immobilizing Cu nanoparticles within the pore system of Alia microspheres, preventing direct contact between individual Cu particles. Both Cu-loaded and unloaded silica microspheres were-then used as fillers in polymer composites prepared with thermoplastic SEBS rubber is the matrix. With a metallic Cu content of about 0.26 vol % In the compoilte, a relative increase of 94% In real permittivity was obtained. No Cu-induced relaxations were observed in the dielectric spectrum within the studied frequency range of 0.1 Hz to 1 MHz. When related to the amount of conductive nanoparticles, the obtained composites achieve the highest broad spectrum enhancement of permittivity ever reported for a polymer based composite.

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Metadaten
Author:Guggi Kofod, Sebastian Risse, Hristiyan Stoyanov, Denis N. McCarthy, Sergey Sokolov, Ralph Krähnert
DOI:https://doi.org/10.1021/nn103097q
ISSN:1936-0851 (print)
Parent Title (English):ACS nano
Publisher:American Chemical Society
Place of publication:Washington
Document Type:Article
Language:English
Year of first Publication:2011
Year of Completion:2011
Release Date:2017/03/26
Tag:broad-spectrum permittivity enhancement; metal nanoparticles; nanocomposite; uniform spatial arrangement
Volume:5
Issue:3
Pagenumber:7
First Page:1623
Last Page:1629
Funder:German BMBF [FKZ 03X5511, FKZ 03X5517A]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert