Abstract
In the present reported work, TiO2 nanoparticles (NPs) are dispersed into the pure nematic liquid crystal (NLC) in three different concentrations. The used NLC consisted of 4′-(trans, trans-4-alkylbicyclohexyl) carbonates and 4′-(4-(trans, trans-4-alkyl)-4-cyanobicyclohexane, which is an optically sensitive material. Optical parameters like photoluminescence and UV absorbance for this material can be tuned by doping of TiO2 NPs. Study of photoluminescence parameter is crucial for liquid crystalline materials. Therefore, optical and electro-optical parameters are measured here for pure and NP-dispersed NLC system. UV absorbance was found to be decreased for the TiO2-dispersed system when compared to pure NLC. Band gap was also calculated by using Tauc plot method, and it is found to be decreased for the NP-dispersed system. Photoluminescence study revealed that PL intensity increases after the dispersion of NPs into the pure NLC. This is the key output of the present reported work. Response time measurement was measured by Optical Switching method, and it is found to be reduced for NP-dispersed system when compared to pure NLC. Contrast ratio of the NP-dispersed system was also found to be increased. Threshold voltage showed that it decreases after the dispersion of NPs into the pure NLC. Enhanced photoluminescence, fast optical response time and high contrast ratio are the promising results of the present reported work because these parameters have many applications in the liquid crystal displays, opto-electronics devices and photonic devices.
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Chen, P.S., Huang, C.C., Liu, Y.W., Chao, C.Y.: Effect of insulating-nanoparticles addition on ion current and voltage-holding ratio in nematic liquid crystal cells. Appl. Phys. Lett. 90, 211111–211116 (2007)
Chen, W.T., Chen, P.S., Chao, C.Y.: Effect of doped insulating nanoparticles on the electro-optical characteristics of nematic liquid crystals. Jpn. J. Appl. Phys. 48, 015006–015009 (2009)
Hayden, S.C., Allam, N.K., El-Sayed, M.A.: TiO2 nanotube/CdS hybrid electrodes: extraordinary enhancement in the inactivation of Escherichia coli. J. Am. Chem. Soc. 132, 14406–14408 (2010)
Ravez, J., Broustera, C., Simon, A.: Lead-free ferroelectric relaxor ceramics in the BaTiO3–BaZrO3–CaTiO3 system. J. Mater. Chem. 9, 1609–1613 (1999)
Arshak, A., Arshak, K., Morris, D., Korostynska, O., Jafer, E.: Investigation of TiO2 thick film capacitors for use as strain gauge sensors. Sens. Actuators A Phys. 122, 242–249 (2005)
Dutta, S., Patra, A.K., De, S., Bhaumik, A., Saha, B.: Self-assembled TiO2 nanospheres by using a biopolymer as a template and its optoelectronic application. ACS Appl. Mater. Interfaces 4, 1560–1564 (2012)
Li, Z., Zhang, H., Zheng, W., Wang, W., Huang, H., Wang, C.: Highly sensitive and stable humidity nanosensors based on LiCl doped TiO2 electrospun nanofibers. J. Am. Chem. Soc. 130, 5036–5037 (2008)
Colomer, M.T., Jurado, J.R.: Structural, microstructural, and electrical transport properties of TiO2–RuO2 ceramic materials obtained by polymeric sol–gel route. Chem. Mater. 12, 923–930 (2000)
Yan, J., Zhou, F.: TiO2 nanotubes: structure optimization for solar cells. J. Mater. Chem. 21, 9406–9418 (2011)
Ghorai, T.K., Biswas, N.: Photodegradation of rhodamine 6G in aqueous solution via SrCrO4 and TiO2 nano-sphere mixed oxides. J. Mater Res Technol 2, 10–17 (2013)
Yadav, S.P., Manohar, R., Singh, S.: Effect of TiO2 nanoparticles dispersion on ionic behaviour in nematic liquid crystal. Liq. Cryst. 42, 1095–1101 (2015)
Roose, B., Pathak, S., Steiner, U.: Doping of TiO2 for sensitized solar cells. Chem. Soc. Rev. 44, 8326–8349 (2015)
Gupta, S.K., Singh, D.P., Manohar, R.: Electrical and polarization behaviour of titania nanoparticles doped ferroelectric liquid crystal. Adv. Mater. Lett. 6(1), 68–72 (2015)
Chou, T.R., Hsieh, J., Chen, W.T., Chao, C.Y.: Influence of particle size on the ion effect of TiO2 nanoparticle doped nematic liquid crystal cell. Jpn. J. Appl. Phys. 53(7), 071701–071706 (2014)
Yadav, G., Katiyar, R., Pathak, G., Manohar, R.: Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal. J. Theor. Appl. Phys. 1, 1–8 (2018)
Lee, W.-K., Choi, J.-H., Na, H.-J., Lim, J.-H., Han, J.-M., Hwang, J.-Y., Seo, D.-S.: Low-power operation of vertically aligned liquid-crystal system via anatase–TiO2 nanoparticle dispersion. Opt. Lett. 34, 3653–3655 (2009)
Huang, C.Y., Selvaraj, P., Senguttuvan, G., Hsu, C.J.: Electro-optical and dielectric properties of TiO2 nanoparticles in nematic liquid crystals with high dielectric anisotropy. J. Mol. Liq. 286, 110902–110906 (2019)
Marzal, V., Caño-García, M., Torres, J.C., Quintana, X., Pérez, I., Garcia-Camara, B.: Electrical behavior of liquid crystal devices with dielectric nanoparticles. J. Nanomater. 1, 1–7 (2020)
Pathak, G., Katiyar, R., Agrahari, K., Srivastava, A., Dabrowski, R., Garbat, K., Manohar, R.: Analysis of birefringence property of three different nematic liquid crystals dispersed with TiO2 nanoparticles. Opto-Electron. Rev. 26, 11–18 (2018)
Pathak, G., Pandey, S., Katiyar, R., Srivastava, A., Dabrowski, R., Garbat, K., Manohar, R.: Analysis of photoluminescence, UV absorbance, optical band gap and threshold voltage of TiO2 nanoparticles dispersed in high birefringence nematic liquid crystal towards its application in display and photovoltaic devices. J. Lumin. 192, 33–39 (2017)
Asahi, R., Taga, Y., Mannstadt, W., Freeman, A.: Phys. Rev. B: Condens. Matter Mater. Phys. 61, 7459–7465 (2000)
Pathak, G., Agrahari, K., Yadav, G., Srivastava, A., Strzezysz, O., Manohar, R.: Tuning of birefringence, optical response time and dielectric anisotropy by the dispersion of fluorescent dye into the nematic liquid crystal. Appl. Phys. A 124, 463–471 (2018)
Manohar, R., Pandey, K.K., Yadav, S.P., Srivastava, A.K., Misra, A.K.: Surface anchoring effect on guest-host ferroelectric liquid crystal response time—an electro-optical investigation. Philos. Mag. 90(34), 4529–4539 (2010)
Potukuchi, D.M., George, A.K., Carboni, C., Al-Harthi, S.H., Naciri, J.: Frequency dielectric relaxation, spontaneous polarization, optical tilt angle and response time investigations in a fluorinated ferroelectric liquid crystal, N125F2(R*). Ferroelectrics 300, 79–93 (2004)
Pandey, S., Vimal, T., Singh, D.P., Gupta, S.K., Pathak, G., Katiyar, R., Manohar, R.: Core/shell quantum dots in ferroelectric liquid crystals matrix: effect of spontaneous polarisation coupling with dopant. Liq. Cryst. 43, 980–993 (2016)
Tauc, J.: Optical properties and electronic structure of amorphous Ge and Si. Mater. Res. Bull. 3, 37–46 (1968)
Karapinar, R.: Electro-optic response of a polymer dispersed liquid crystal film. Tr. J. Phys. 22, 227–236 (1998)
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One of the authors RM is thankful to UGC for MID CAREER AWARD and Centre for Excellence—Uttar Pradesh Government at APJ Abdul Kalam Centre for Innovation—University of Lucknow, Lucknow.
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Pathak, G., Shukla, G., Srivastava, A. et al. Dispersion of nanoparticles into the low birefringent nematic liquid crystal: study of optical and electro-optical parameters and its applicability towards liquid crystal displays. J Theor Appl Phys 14 (Suppl 1), 51–59 (2020). https://doi.org/10.1007/s40094-020-00402-4
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DOI: https://doi.org/10.1007/s40094-020-00402-4