Single-wall carbon nanotubes (SWCNTs) have been doped in the nematic matrix of a room temperature liquid crystalline material 4-(trans-4'-n-hexylcyclohexyl)isothiocyanatobenzene (6CHBT). Effect of SWCNTs doping on various display parameters, namely, threshold voltage, dielectric anisotropy, and splay elastic constant has been studied using electro-optical and dielectric spectroscopy. The nematic phase supports alignment of SWCNTs parallel to the nematic director. On the other hand, the presence of SWCNTs improves local orientational ordering of molecules in the nematic phase. Consequently, the threshold voltage required to switch the molecules from planar (bright state) to homeotropic (dark state) configuration is substantially reduced in the presence of the SWCNTs.
We have prepared the composites of a room temperature nematic liquid crystal namely 4-(trans-4-n-hexylcyclohexyl) isothiocyanatobenzoate (6CHBT) and Cadmium Selenide Quantum Dots (CdSe-QDs) and investigated their electro-optical and dielectric properties. Effect of dispersion of CdSe-QDs on various electro-optical and display parameters of host liquid crystalline material have been studied. Physical parameters, such as switching threshold voltage and splay elastic constant have been altered drastically for composites. Dispersion of QDs in a liquid crystals medium destabilizes nematic ordering of the host and decreases the nematic-to-isotropic transition temperature.
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