Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

ELECTRIC/DIELECTRIC PROPERTIES OF COMPOSITES FILLED WITH ONION-LIKE CARBON AND MULTIWALLED CARBON NANOTUBES
Ieva Kranauskaitė^a, Jūras Banys^a, Ewa Talik^b, Vladimir Kuznetsov^c, Nicolas Nunn^d, and Olga Shenderova^d
^aVilnius University, Saulėtekio 9, LT-00122 Vilnius, Lithuania
E-mail: ieva.kranauskaite@ff.vu.lt
^bInstitute of Physics, University of Silesia, ul. Uniwersytecka 4, PL-40-007 Katowice, Poland
^cBoreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, Novosibirsk, 630090, Russia
^dInternational Technology Center, Raleigh, NC 27715, USA

Received 3 February 2015; revised 6 March 2015; accepted 20 March 2015

The dielectric/electric properties of polyurethane composites filled with carbon nanotubes (CNTs), onion-like carbon (OLC) and mixed onion-like carbon/carbon nanotubes are compared across a wide frequency range from hertz to terahertz. The highest value of dielectric permittivity and electrical conductivity is observed in composites with carbon nanotubes. However, the dielectric/electric properties of composites filled with onion-like carbon are also very attractive and can be improved by addition of small amounts of carbon nanotubes due to the strong synergy effect. In composites with inclusions of mixed onion-like carbon/carbon nanotubes, the dielectric permittivity and electrical conductivity increase due to the decreasing of both the potential barrier for carrier tunneling and the average distance between nanocarbon clusters.

Keywords: carbon nanotubes, onion-like carbon, synergy, composites
PACS: 72.80.Tm, 77.22.Ch, 81.05.ub, 81.07.De

KOMPOZITŲ SU SVOGŪNINĖS ANGLIES IR DAUGIASIENIŲ ANGLIES NANOVAMZDELIŲ UŽPILDU ELEKTRINĖS IR DIELEKTRINĖS SAVYBĖS

Ieva Kranauskaitė^a, Jūras Banys^a, Ewa Talik^b, Vladimir Kuznetsov^c, Nicolas Nunn^d, Olga Shenderova^d
^aVilniaus universitetas, Vilnius, Lietuva
^bSilezijos universiteto Fizikos institutas, Katovicai, Lenkija
^cRusijos MA Sibiro skyriaus Boreskovo katalizės institutas, Novosibirskas, Rusija
^dTarptautinis technologijos centras, Rolis, Šiaurės Karolina, JAV

Straipsnyje aptariamos kompozitų su anglies nanovamzdelių, svogūninės anglies, mišriu nanovamzdelių ir svogūninės anglies užpildu plačiame dažnių diapazone elektrinės bei dielektrinės savybės.
Kompozituose su anglies nanovamzdeliais yra stebimos didesnės dielektrinės skvarbos ir laidumo vertės nei kompozituose su svogūninės anglies užpildu. Kompozitų su svogūninės anglies užpildu elektrinės savybės gali būti pagerintos įterpiant nedidelį kiekį anglies nanovamzdelių. Mišriuose kompozituose dėl sumažėjusio atstumo tarp anglies intarpų mažėja potencinis barjeras elektronams tuneliuoti, todėl padidėja kompozitų dielektrinė skvarba ir elektrinis laidumas.

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