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Resonant and Broadband Microwave Permittivity Measurements of Single-walled Carbon Nanotubes

Published online by Cambridge University Press:  01 February 2011

Chinmay D. Darne ,
Lei-Ming Xie ,
Divya Padmaraj ,
Paul Cherukuri ,
Wanda Zagozdzon-Wosik  and
Jarek Wosik
Chinmay D. Darne
Affiliation:
University of Houston, Electrical and Computer Engineering, 4800 Calhoun road, Houston, TX, 77004, United States
Lei-Ming Xie
Affiliation:
[email protected], University of Houston, Texas Center for Superconductivity, Houston, TX, 77204, United States
Divya Padmaraj
Affiliation:
[email protected], University of Houston, Department of Electrical and Computer Engineering, Houston, TX, 77204, United States
Paul Cherukuri
Affiliation:
[email protected], Rice University, Department of Chemistry, Houston, TX, 77005, United States
Wanda Zagozdzon-Wosik
Affiliation:
[email protected], University of Houston, Department of Electrical and Computer Engineering, Houston, TX, 77204, United States
Jarek Wosik
Affiliation:
[email protected], University of Houston, Department of Electrical and Computer Engineering, Houston, TX, 77204, United States
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Abstract

We report on microwave measurements of complex permittivity of single-walled carbon nanotubes (SWNTs). The SWNT samples are a mixture of semiconducting and metallic nanotubes suspended using Pluronic (F108) as a stabilizing surfactant agent. Other samples that were characterized include pluronic powder and an oriented carpet of multi-walled nanotubes (MWNT). For broadband measurements, the shielded open-circuited transmission line technique was used. Single frequency (resonant) measurements for liquid-based SWNT samples were carried out by employing two different modes in specially designed microwave dielectric resonators (DR), either with a cylindrical hole in the center of a dielectric disk or with a horizontal gap (split resonator). The first resonator can operate in either TE011 or TM011 modes (3.4 GHz and 6 GHz) and was designed for liquid or powder characterization. For pluronic suspended SWNT, real (epsilon) and imaginary parts of permittivity were found at 3.4 GHz as 3.5 and 0.72, respectively.

Keywords

dielectric propertiesliquidnanoscale
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1057: Symposium II – Nanotubes and Related Nanostructures , 2007 , 1057-II15-61
Copyright
Copyright © Materials Research Society 2008

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References

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