Composition dependent microwave properties of dielectric-conductor nanocomposites

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Abstract
Broadband dielectric spectra of dielectric-conductor nanocomposites of poly(ethylene terephthalate) with multiwalled carbon nanotubes (PET-xCNT) were used for calculation of their free-space shielding and absorbing parameters in the frequency range from 1 MHz to 1 THz. Revealed correlation of the composition and frequency dependent microwave dielectric and shielding/absorbing parameters allows determination of the CNT concentration range optimized for the shielding (x ≥ 0.4 vol%) and absorption (0.12 < x < 0.6 vol%) applications. Broadband (two frequency decades) 40 dB shielding, narrowband 30÷40 dB absorption and high attenuation constant up to 104 neper/m were demonstrated.
Funding Information
  • Czech Academy of Sciences (PAN-17-04)
  • European Structural and Investment Funds and the Czech Ministry of Education, Youth and Sports (SOLID21 - CZ.02.1.01/0.0/0.0/16_019/0000760)