Characterization of multi-walled carbon nanotube (MWNT) papers using X-band waveguides

Hao Xin, Lu Wang, David Carnahan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

Multi-walled carbon nanotubes (MWNT) are characterized at X-band (8-12 GHz) by waveguide measurements. The scattering parameters (S-parameters) of thin MWNT papers containing a large ensemble of randomly oriented nanotubes are measured by a vector network analyzer. An extraction algorithm has been developed to compute the effective complex permittivity (ε= ε-j ε'') and permeability (μ = μ' -j μ'') of the MWNT papers from the measured S-parameters. The extracted effective medium parameters are verified by finite-element simulations using Ansoft HFSS. The uncertainties for this characterization method are analyzed. The extracted conductivity of the MWNT papers is on the order of 1500 S/m and the dielectric constant is on the order of-500. No significant magnetic responses are observed. To overcome the relatively large uncertainty associated with the reflection coefficient S11, the extracted imaginary permittivity (ε'') is fitted by the Drude model and the dielectric constant (ε') and permeability are recalculated.

Original languageEnglish (US)
Title of host publication2007 IEEE MTT-S International Microwave Symposium Digest
Pages1181-1184
Number of pages4
DOIs
StatePublished - Oct 2 2007
Event2007 IEEE MTT-S International Microwave Symposium, IMS 2007 - Honolulu, HI, United States
Duration: Jun 3 2007Jun 8 2007

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X

Other

Other2007 IEEE MTT-S International Microwave Symposium, IMS 2007
CountryUnited States
CityHonolulu, HI
Period6/3/076/8/07

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Keywords

  • Conductivity
  • Drude model
  • MWNT
  • Permeability
  • Permittivity
  • Waveguide

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Xin, H., Wang, L., & Carnahan, D. (2007). Characterization of multi-walled carbon nanotube (MWNT) papers using X-band waveguides. In 2007 IEEE MTT-S International Microwave Symposium Digest (pp. 1181-1184). [4264040] (IEEE MTT-S International Microwave Symposium Digest). https://doi.org/10.1109/MWSYM.2007.380341