TY  - JOUR
A1  - Kofod, Guggi
A1  - Risse, Sebastian
A1  - Stoyanov, Hristiyan
A1  - McCarthy, Denis N.
A1  - Sokolov, Sergey
A1  - Krähnert, Ralph
T1  - Broad-spectrum enhancement of polymer composite dielectric constant at ultra low volume fractions of silica-supported copper nanoparticles
JF  - ACS nano
N2  - 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.
KW  - nanocomposite
KW  - broad-spectrum permittivity enhancement
KW  - metal nanoparticles
KW  - uniform spatial arrangement
Y1  - 2011
U6  - https://doi.org/10.1021/nn103097q
SN  - 1936-0851
VL  - 5
IS  - 3
SP  - 1623
EP  - 1629
PB  - American Chemical Society
CY  - Washington
ER  -