Enhanced electro-optical properties in gold nanoparticles doped ferroelectric liquid crystals

Kaur, S.; Singh, Surinder P.; Biradar, A. M.; Choudhary, Amit; Sreenivas, K.

doi:10.1063/1.2756136

Cited by 168 publications

(88 citation statements)

References 31 publications

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“…6,7 The addition of gold NPs in ferroelectric liquid crystals ͑FLCs͒ has been reported earlier in order to observe low threshold and nonvolatile memory effect. 8,9 Zhang et al 10 observed the lowering of threshold voltage of CdS NPs doped 4-pentyl-4'-cyanobiphenyl ͑5CB͒ twisted nematic cells by 25%. The low power operation of vertically aligned LC by doping a minute amount of anatase TiO 2 -NPs have been observed by Lee et al 11 Zinc oxide ͑ZnO͒ has been employed in a variety of devices such as gas sensors, solar cells, luminescent materials, and transparent conducting coatings due to its wide range of optical and electrical properties.…”

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confidence: 99%

Low power operation of ferroelectric liquid crystal system dispersed with zinc oxide nanoparticles

Joshi

Kumar

Prakash

et al. 2010

Applied Physics Letters

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106

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We present the results based on electro-optical properties of zinc oxide nanoparticles ͑ZnO-NPs͒ doped ferroelectric liquid crystal ͑FLC͒. It is observed that ZnO-NPs-FLC system has low operating voltage and improved optical contrast. The lowering in operating voltage and improvement in optical contrast has been attributed to larger dipole moment of ZnO-NPs that enhances the anchoring of FLC molecules around ZnO-NPs. The effect of ZnO-NPs on the material parameters of FLC has also been observed. These studies will certainly provide a tool to understand the interaction of ZnO-NPs with FLC molecules that can be utilized to fabricate low threshold electro-optic devices.

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confidence: 99%

Low power operation of ferroelectric liquid crystal system dispersed with zinc oxide nanoparticles

Joshi

Kumar

Prakash

et al. 2010

Applied Physics Letters

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106

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“…More recently, the effects of GNRs on the nematic liquid crystal (NLC) matrixes have also been reported. 12 It was observed that GNRs form their own self assembling well ordered structures inside the LC matrix. A large change in the electro-optical properties of a polymer dispersed liquid crystal (PDLC) due to inclusion of 14 nm diameter GNPs has also been observed.…”

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confidence: 99%

Effect of gold nano-particles on switch-on voltage and relaxation frequency of nematic liquid crystal cell

et al. 2011

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We report the observation of large changes in the electro-optical properties of nematic liquid crystal (NLC) due to inclusion of small concentration of 10 nm diameter gold nanoparticles (GNPs). It is observed that GNPs lower switch-on voltage and also lower the relaxation frequency with applied voltage (AC field) to NLC cell. These studies of GNP doped NLC cell have been done using optical interferometry and capacity measurement by impedance analyzer. The change in threshold voltage and relaxation frequency by doping GNPs in NLC is explained theoretically

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“…In the works [4,5], being based on studies of the optical characteristics inherent to the mixture of ANP with LC, it was shown that aggregation of ANP can be reduced if using LC that has a smectic phase. The change in the optical or electrooptical properties of ferroelectric LC, when introducing ANP, was considered in [6][7][8][9]. The influence of ANP on non-linear optical properties of LC was studied in [10].…”

Section: Introductionmentioning

confidence: 99%

The non-linear dependence of 6СНВТ liquid crystal conductivity on the concentration of gold nanoparticles

Koval’chuk¹

2016

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract.Within the frequency range 10 -1 …106 Hz at the temperature 293 K, the effect of gold nanoparticles on the dielectric properties of the planar-oriented nematic liquid crystal 6СНВТ has been studied. The concentration of nanoparticles with the average diameter 3 to 5 nm was chosen as 0.01, 0.02 and 0.1 wt.%. It has been shown that for the frequencies less than 10 Hz, the dielectric properties of the samples can be described with the Debye dispersion. For the samples with the concentration of gold nanoparticles 0.1 wt.%, the time of relaxation has been estimated (4.7±0.5 s). It has been also shown that the conductivity of the liquid crystal depends non-linearly on the concentration of nanoparticles introduced into the liquid crystal. The greatest change in conductivity of the liquid crystal on the concentration of introduced gold nanoparticles has been obtained within the range of 0.01 to 0.02 wt.%. It has been assumed that the conductivity of 6СНВТ that depends non-linearly on the concentration of introduced gold nanoparticles is caused by the competing processes of ion desorption from the gold nanoparticles and of nanoparticle aggregation.

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Enhanced electro-optical properties in gold nanoparticles doped ferroelectric liquid crystals

Cited by 168 publications

References 31 publications

Low power operation of ferroelectric liquid crystal system dispersed with zinc oxide nanoparticles

Low power operation of ferroelectric liquid crystal system dispersed with zinc oxide nanoparticles

Effect of gold nano-particles on switch-on voltage and relaxation frequency of nematic liquid crystal cell

The non-linear dependence of 6СНВТ liquid crystal conductivity on the concentration of gold nanoparticles

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