We study the dielectric properties of nanocomposites in the 0–1.5-GHz frequency regime. These composites consist of electrically insulated metallic nanoparticles and carbon nanotubes, the elongated nanostructures in this study, uniformly dispersed in a dielectric matrix. We find that the properties of these composites depend crucially on the shape and monodispersity of the nanoparticles. While at high concentrations the spherical nanoparticles cause only slight modification of the dielectric function of the composite with respect to the matrix, the elongated nanoparticles produce composites with an enhanced real part of the dielectric function and low imaginary part. Our theory, which is in excellent agreement with these results, suggests specific ways to further improve the dielectric properties of the composites.
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1 August 2005
Research Article|
August 10 2005
Dielectric media based on isolated metallic nanostructures
T. Kempa;
D. Carnahan;
D. Carnahan
NanoLab
, Inc., Newton, Massachusetts 02458
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M. Olek;
M. Olek
Center for Advanced European Studies and Research (CAESAR)
, 53175 Bonn, Germany
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M. Correa;
M. Correa
Center for Advanced European Studies and Research (CAESAR)
, 53175 Bonn, Germany
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M. Giersig;
M. Giersig
Center for Advanced European Studies and Research (CAESAR)
, 53175 Bonn, Germany
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M. Cross;
M. Cross
Mega Wave Corporation
, Boylston, Massachusetts 01505
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G. Benham;
G. Benham
Mega Wave Corporation
, Boylston, Massachusetts 01505
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M. Sennett;
M. Sennett
US Army,
Natick Soldier Center
, Natick, Massachusetts 01760
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Z. Ren;
Z. Ren
Boston College
, Chestnut Hill, Massachusetts 02467
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K. Kempa
K. Kempa
Boston College
, Chestnut Hill, Massachusetts 02467
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a)
Electronic mail: thomas.kempa@imperial.ac.uk
J. Appl. Phys. 98, 034310 (2005)
Article history
Received:
March 01 2005
Accepted:
June 13 2005
Citation
T. Kempa, D. Carnahan, M. Olek, M. Correa, M. Giersig, M. Cross, G. Benham, M. Sennett, Z. Ren, K. Kempa; Dielectric media based on isolated metallic nanostructures. J. Appl. Phys. 1 August 2005; 98 (3): 034310. https://doi.org/10.1063/1.1996836
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