Electrical properties of the octyl cyanobiphenyl nematic liquid crystal dispersed with graphene oxide
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Electrical properties of the octyl cyanobiphenyl nematic liquid crystal dispersed with graphene oxide ¨ zgan1,* S¸ u¨kru¨ O 1 2
and Hasan Eskalen2
Department of Physics, Kahramanmaras¸ Sütçü ˙Imam University, Kahramanmaras¸ , Turkey Vocational School of Health Services, Department of Medical Services and Techniques, Opticianry Program, Kahramanmaras¸ Sütçü ˙Imam University, Kahramanmaras¸ , Turkey
Received: 12 June 2020
ABSTRACT
Accepted: 16 September 2020
Graphene oxide (GO) with different concentrations was dispersed to pristine octyl cyanobiphenyl nematic liquid crystal. The characteristics of the used GO were investigated with X-Ray diffraction (XRD), scanning electron microscopy (SEM) and UV–Vis spectroscopy. Also the bandgap values of GO were calculated. The impact of doping concentration on the thermal and electrical properties of prepared samples was investigated. The phase transition temperatures of samples were studied by differential scanning calorimeter. The isotropic phase transition temperature has decreased by the addition of graphene oxide ratio in samples. The electrical properties of the samples have been examined by measuring dielectric permittivity, capacitance and impedance of samples with an impedance analyzer. Also, electrical behaviors of pure and GO-dispersed samples under bias voltage were studied. The relaxation frequencies of specimens were obtained. The dielectric anisotropy and relaxation frequency also increased due to the presence of graphene oxide flakes. The dielectric permit0 tivity e of GO-dispersed samples enhanced under the bias voltage was revealed.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction During the last few decades, Liquid Crystals (LCs) have attracted significant attention due to their considerable sensitivity to external electric or magnetic fields [1]. LCs are widely used in LC display technology mainly because of their superior electro-optical properties [2, 3]. It has been proven that dispersing nanomaterials into LCs could enhance and tune their electro-optical properties [4–7]. With nanoparticles added to the liquid crystals, they can
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https://doi.org/10.1007/s10854-020-04503-3
reveal some features that are neither present in the liquid crystal nor the nanoparticle [8]. The physical properties of LCs could be improved by dispersing NPs. In this context, researchers have concentrated on the dispersion of different NPs in LCs [9–17]. In literature, various nanomaterials have been used to obtain LC materials with enhanced electro-optical properties: Au NPs [18–21], ZnO NPs [22–26], Co3O4 [27, 28] MgO and SiO2 [29, 30], TiO2 [31, 32], SrTiO3 [33], CdSe quantum dot [34] and last but not least the nanoscale carbon-based materials. Electrical and
J Mater Sci: Mater Electron
optical properties of carbon nanotube/graphene nanoplate to ZnO matrix are investigated [35] Multiwall carbon nanotubes (MWCNT) have tuned the electro-optical and dielectric properties of ferroelec
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