Polydimethylsiloxane-multiwalled carbon nanotube composite as a metamaterial

Hitha D. Shetty*, Ananya Patra, V. Prasad

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Negative permittivity is an exceptional property of metamaterials, which makes them unique class of artificial materials with numerous applications ranging from cloaking to wave filters. In this paper we report about the PDMS (Polydimethylsiloxane)–MWcnt (Multi wall carbon nano tube) composite beyond percolation, as a metamaterial with high negative permittivity. Percolated composite showed high negative permittivity of −2376.62 at 2541.401 Hz and low tangent loss of −0.065 at 1 MHz. The conductivity spectra followed Jonscher's power law, indicating hopping conduction for composites below percolation threshold. Beyond percolation, networking between the MWcnts formed large number of conductive paths resulting in free electron conduction. The impedance studies showed the capacitive-inductive transition in the percolated composite with inductive phase exhibiting negative permittivity.

Original languageEnglish
Pages (from-to)309-313
Number of pages5
JournalMaterials Letters
StatePublished - 1 Jan 2018
Externally publishedYes


  • Carbon nanotubes
  • Low dielectric loss
  • Negative permittivity
  • Polymer nanocomposites


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