Semiconductor Physics, Quantum Electronics & Optoelectronics. 2014. V. 17, N 4. P. 384-388.
https://doi.org/10.15407/spqeo17.04.384

                                                                 

Peculiarities of nonadditive changes in conductivity of nano-PDLC under influence of magnetite and single-wall carbon nanotubes
P. Kopcansky1, M. Timko1,Z. Mitrova1, N. Tomasovicova1, L. Tomco1, O.V. Kovalchuk2,3, T.M. Kovalchuk4, I.V.Oleinikova2, A.I.Lad2, I.P. Studenyak5

1Institute of Experimental Physics, Slovak Academy of Sciences, 47, Watsonova str., 04001 Kosice, Slovak Republic
2Kyiv National University of Technologies and Design,
2, Nemirovich-Danchenko str., 01011 Kyiv, Ukraine; E-mail: akoval@knutd.com.ua
3Institute of Physics, National Academy of Science of Ukraine, 46, prospect Nauky, 03028 Kyiv, Ukraine
4V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, 41, prospect Nauky, 03028 Kyiv, Ukraine
5Uzhgorod National University, 46, Pidhirna str., 88000 Uzhgorod, Ukraine

Abstract. Studied in this work has been the effect of nanoparticles – magnetite and single-wall carbon nanotubes - separately and together on the conductivity of nematic liquid crystal 6CHBT dispersed in polyvinyl alcohol.Morphology of these films wasanalyzed using an electron microscope. When usingselected technologyof homogenizing the mixture components, there takes placeformation of liquid crystals dispersed in the polymer matrix with the average sizes of liquid-crystal droplets close to 500 nm (nano-PDLC). It has been foundthatsimultaneousintroduction of magnetite and nanotubes results in loweringthe conductivity of nano-PDLC as compared to the total conductivity of nano-PDLC with each kind of nanoparticles separately. It has been suggested that the main mechanism of this effect lies in formation of deep centers for electroncapture by complexes with different types of nanoparticles,which leads to a decrease in electronic conductivity through the polymer matrix.

Keywords:magnetic nanoparticle, single-wall carbon nanotube, permittivity, ion component of the conductivity, electron component of the conductivity, polymer matrix.

Manuscript received 00.00.14; revised version received 05.09.14; accepted for publication 00.00.14; published online 00.00.14.

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