Semiconductor Physics, Quantum Electronics & Optoelectronics, 22 (4), P. 387-390 (2019).

Influence of anion substitution on electrical conductivity of composites based on liquid crystal with Cu6PS5X (X = I, Br) nanoparticles
I.P. Studenyak1, O.V. Kovalchuk2,3,4, S.I. Poberezhets3, M. Timko5, P. Kopčanský5

1Uzhhorod National University, 3, Narodna Sq., 88000 Uzhhorod, Ukraine
2Kyiv National University of Technologies and Design, 2, Nemirovich-Danchenko str., 01011 Kyiv, Ukraine
3Institute of Physics, NAS of Ukraine 46, prospect Nauky, 03680 Kyiv, Ukraine
4National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” 37, prospect Peremohy, 03056 Kyiv, Ukraine
5Institute of Experimental Physics, Slovak Academy of Sciences 47, Watsonova Str., 04001, Košice, Slovakia E-mail:;

Abstract. Dielectric properties of composites based on planar-oriented 6СВ liquid crystal with Cu6PS5X (X = I, Br) nanoparticles at 293 K in the frequency range from 6 to 106 Hz have been studied. The concentration of nanoparticles varied from 0 up to 0.1 wt.%. It has been shown that Сu6PS5Вr nanoparticles significantly less influence the conductivity of 6CB than the Сu6PS5I nanoparticles. Moreover, at the concentrations 0.01 to 0.05 wt.% of Cu6PS5Br nanoparticles the conductivity of LC decreases. It has been assumed that the nonmonotonic dependence of 6CB conductivity on the concentration of Cu6PS5Br super-ionic nanoparticles is caused by two competing mechanisms: an increase in conductivity due to the introduction of conductive impurities with nanoparticles and a decrease in conductivity caused by adsorption of impurities on the surface of nanoparticles.

Keywords: superionic conductors, liquid crystal, dielectric permittivity, electrical conductivity, concentration dependence.

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