Semiconductor Physics, Quantum Electronics & Optoelectronics, 20 (4), P. 437-441 (2017).

Saturation effect for dependence of the electrical conductivity of planar oriented nematic liquid crystal 6CB on the concentration of Cu7PS6 nanoparticles
O.V. Kovalchuk1, I.P. Studenyak2, V.Yu. Izai2, S.O. Rybak2, A.I. Pogodin2, P. Kopčanský3, M. Timko3, V. Gdovinova3, J. Mariano4, T.M. Kovalchuk5

1Kyiv National University of Technologies and Design, 2, Nemirovich-Danchenko str., 01011 Kyiv, Ukraine E-mail:
2Uzhhorod National University, Faculty of Physics, 3, Narodna Sq., 88000 Uzhhorod, Ukraine
3Institute of Experimental Physics, Slovak Academy of Sciences, 47, Watsonova str., 04010 Košice, Slovak Republic
4University of the Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
5V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, 41, prospect Nauky, 03680 Kyiv, Ukraine

Abstract. The influence of Cu7PS6 nanoparticles with the average size 117 nm on the dielectric properties of planar oriented nematic liquid crystal 6CB has been investigated within the frequency range 101…106 Hz and at the temperature 293 K. It has been shown that when changing the concentration of nanoparticles within the range 0 to 1 wt.%, the conductivity of the liquid crystal changes stronger than its dielectric permittivity. It has been shown that the electrical conductivity increases monotonously with increasing the concentration of nanoparticles. However, for this dependence a saturation effect is observed. The mechanism of this effect was proposed.

Keywords: nematic liquid crystal, superionic nanoparticles, electrical conductivity, dielectric properties, saturation effect.

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