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Polydimethylsiloxane-multiwalled carbon nanotube composite as a metamaterial

Shetty, Hitha D and Patra, Ananya and Prasad, V (2017) Polydimethylsiloxane-multiwalled carbon nanotube composite as a metamaterial. In: MATERIALS LETTERS, 210 . pp. 309-313.

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Official URL: http://doi.org/10.1016/j.matlet.2017.09.051

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. (C) 2017 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Publication: MATERIALS LETTERS
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 11 Nov 2017 07:25
Last Modified: 11 Nov 2017 07:25
URI: http://eprints.iisc.ac.in/id/eprint/58179

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