The complex permittivity spectra and conductivity of graphite nanoplatelet (GNP)/epoxy composites were measured to assess the application potential of these materials as conductive coatings and/or microwave absorbers with high structural integrity. The frequency used ranged from 0.05 to 18.0 GHz. The measured static conductivity was in fairly good agreement with the prediction from the Neelakanta equations. For the complex permittivity, however, the measured values were much higher than those predicted. A better prediction required the use of the order function as a semiempirical parameter to account for the particle loading effect. The surface treatment using nitric acid was found to increase both the conductivity and permittivity of the GNP/epoxy composites although the effect was small, which led to the decrease in the matching thickness of microwave absorbers.
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1 August 2008
Research Article|
August 01 2008
Microwave properties of graphite nanoplatelet/epoxy composites
Sang-Eui Lee;
Sang-Eui Lee
a)
1Department of Mechanical and Aerospace Engineering,
University of California at Los Angeles
, Los Angeles, California 90095, USA
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Oyoung Choi;
Oyoung Choi
1Department of Mechanical and Aerospace Engineering,
University of California at Los Angeles
, Los Angeles, California 90095, USA
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H. Thomas Hahn
H. Thomas Hahn
1Department of Mechanical and Aerospace Engineering,
University of California at Los Angeles
, Los Angeles, California 90095, USA
2Department of Material Science and Engineering,
University of California at Los Angeles
, Los Angeles, California 90095, USA
and California NanoSystems Institute, University of California at Los Angeles
, Los Angeles, California 90095, USA
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a)
Electronic mail: [email protected].
J. Appl. Phys. 104, 033705 (2008)
Article history
Received:
March 10 2008
Accepted:
June 06 2008
Citation
Sang-Eui Lee, Oyoung Choi, H. Thomas Hahn; Microwave properties of graphite nanoplatelet/epoxy composites. J. Appl. Phys. 1 August 2008; 104 (3): 033705. https://doi.org/10.1063/1.2965195
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