Polydimethylsiloxane-multiwalled carbon nanotube composite as a metamaterial

Hitha D. Shetty; Ananya Patra; V. Prasad

doi:10.1016/j.matlet.2017.09.051

Polydimethylsiloxane-multiwalled carbon nanotube composite as a metamaterial

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

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 language	English
Pages (from-to)	309-313
Number of pages	5
Journal	Materials Letters
Volume	210
DOIs	https://doi.org/10.1016/j.matlet.2017.09.051
State	Published - 1 Jan 2018
Externally published	Yes

Keywords

Carbon nanotubes
Low dielectric loss
Negative permittivity
Polymer nanocomposites

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10.1016/j.matlet.2017.09.051

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title = "Polydimethylsiloxane-multiwalled carbon nanotube composite as a metamaterial",

abstract = "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.",

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AB - 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.

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Polydimethylsiloxane-multiwalled carbon nanotube composite as a metamaterial

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Keywords

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