Abstract
Dielectric and electro-optic properties of a weakly polar nematic liquid crystals (NLCs) based on polyvinyl pyrrolidone capped gold nanoparticles doping has been reported. The dielectric spectra of these composites with a concentration of 0.25 wt%, 0.5 wt%, and 1.0 wt% are recorded in the frequency range of 42 Hz to 5.5 MHz. Dielectric permittivity and dielectric loss in these samples have been analyzed for both homogeneously-aligned and vertically-aligned liquid crystal (LC) cells. It has been observed that GNPs doping significantly reduce the threshold voltage (~27%) for LC reorientation which is explained by increased dielectric anisotropy and decreased splay elastic constant of doping LC cells. Nearly 57% faster fall time is also observed as a consequence of a remarkable reduction in the relaxation time (about short molecular axis) thus rotational viscosity of the doping LC cells. GNPs doping has an auspicious application to the fields of LC devices and displays. The present work shows that the composite under investigation performs far better than the pure LC cell in the display as well as photonic applications.
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