Broad-band conductivity and dielectric spectroscopy of composites of multiwalled carbon nanotubes and poly(ethylene terephthalate) around their low percolation threshold

0391942 - FZÚ 2014 RIV GB eng J - Článek v odborném periodiku
Nuzhnyy, Dmitry - Savinov, Maxim - Bovtun, Viktor - Kempa, Martin - Petzelt, Jan - Mayoral, B. - McNally, T.
Broad-band conductivity and dielectric spectroscopy of composites of multiwalled carbon nanotubes and poly(ethylene terephthalate) around their low percolation threshold.
Nanotechnology. Roč. 24, č. 5 (2013), "055707-1"-"055707-9". ISSN 0957-4484. E-ISSN 1361-6528
Grant CEP: GA ČR GAP204/12/0232; GA MŠMT LD12025
Institucionální podpora: RVO:68378271
Klíčová slova: THz and dielectric spectroscopy * multiwalled carbon nanotubes * electrical percolation threshold * fluctuation-induced tunneling conductivity
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 3.672, rok: 2013
http://iopscience.iop.org/0957-4484/24/5/055707/

Composites of multiwalled carbon nanotubes with poly(ethylene terephthalate)(PET–MWCNT) with up to 3 vol% MWCNTs were prepared and characterized by broad-band AC conductivity and dielectric spectroscopy up to the infrared range using several techniques. A very low electrical percolation threshold of 0.07 vol% MWCNTs was revealed from the low-frequency conductivity plateau as well as from DC conductivity, whose values show the same critical power dependence on MWCNT concentration with the exponent t=4.3.The temperature dependence down to ~ 5 K has shown semiconductor behaviour with a concentration-independent but weakly temperature-dependent small activation energy of ~ 3 meV. The behaviour is compatible with the previously suggested fluctuation-induced tunnelling conductivity model through a thin ( ~1 nm) polymer contact layer among the adjacent MWCNTs within percolated clusters.
Trvalý link: http://hdl.handle.net/11104/0220897