Tunable dielectric and memory features of ferroelectric layered perovskite Bi4Ti3O12 nanoparticles doped nematic liquid crystal composite

., Anu .; Varshney, Depanshu; Yadav, K. L.; Prakash, Jai; Meena, Harikesh; Singh, Gautam

doi:10.1016/j.molliq.2022.120820

Cited by 25 publications

(4 citation statements)

References 96 publications

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“…Similarly, there is a report by S. K. Das et al Magnetism, particularly ferromagnetism, can be generated in a oxide ferroelectric nonmagnetic like barium titanate (BaTiO3) by selecting appropriate dopants [42]. The influence of Co and Hf substitution on the structural, magnetic, and ferroelectric characteristics of BaTiO3 was examined using a polycrystalline specimen with great density of BaTi0.9Hf0.05Co0.05O3 [43]. The magnetic order observed in the previous sample is inherent.…”

Section: Diluted Ferromagnetic Semiconductormentioning

confidence: 94%

Development status of optical-electrical-magnetic high-flux coupling materials

Wang

2023

ACE

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In recent years, the development of multifunctional materials with multiphysics coupling effect has attracted great research interest. The coupling effect between magnetoelectric, electro-optical and magneto-optical has always been a hot spot in physics of condensed matter and the study of materials, and has numerous uses for magnetoelectric sensors and display devices. However, with the development of science and technology, the requirements for the performance of photoelectromagnetic materials are becoming higher and higher, people are no longer only satisfied with the effects of photoelectric, magnetoelectric and magneto-optical coupling, the development trend of device miniaturization, multi-function and high performance has encouraged more and more researchers to participate in the research of photoelectromagnetic coupling. Therefore, in recent years, excellent research results of photoelectromagnetic materials have emerged one after another, and the application research of Xiangxing is also in full swing. In this paper, various materials related to the photo-electrical-magnetic coupling effect in recent years are summarized, the challenge is analyzed, and the future development direction is prospected.

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Section: Diluted Ferromagnetic Semiconductormentioning

confidence: 94%

Development status of optical-electrical-magnetic high-flux coupling materials

Wang

2023

ACE

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“…However, certain limitations, such as the lack of gray-scale capability, low contrast ratio, narrow viewing angle, lower light efficiency, requirement of backlight sources, high-power consumption, etc [17,18] have often remained as a bottleneck that researchers time and again have attempted to resolve utilizing a variety of techniques. The dispersion of nanoparticles (NPs, particles with at least one dimension less than 100 nm) in LCs is one such technique that has yielded significant curiosity in the scientific community due to the intriguing and purposeful results that it produces [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. Among NPs, quantum dots (QDs) are well probed due to their miniature size that ranges from 2-10 nm [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon dots on tuning molecular alignment, dielectric and electrical properties of a smectogenic cyanobiphenyl-based liquid crystal material

Kumar,

Gathania

et al. 2024

J. Phys. D: Appl. Phys.

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We demonstrate here the effect of dispersing organosoluble carbon dots (CDs, ∼7-8 nm) on tuning the molecular alignment, dielectric and electrical properties of smectic A (SmA) and nematic (N) mesophases of a thermotropic smectogenic LC material, 4-octyl-4′-cyanobiphenyl (8CB) in a planar anchored ITO sample cell using polarized optical microscopy and dielectric spectroscopic techniques. The cross-polarised optical textures clearly show that the doping of CDs (concentration ≥0.25wt%) in planar anchored 8CB, LC led to change its alignment from planar to vertical. Intrestingly, such induced vertical alignment remains stable throughout SmA and N phases of the 8CB, LC material. Moreover, the magnitude of real dielectric permittivity is found to increase with increasing concentration of CDs and exhibited vertical alignment values for composites (≥0.25wt%). The observance of short axis molecular relaxation for composites (≥0.25wt%) without the application of bias field affirmed again the induced vertical alignment. The accumulation of CDs at the substrate surface and their interaction with alignment and ITO layers could be attributed as an important factor for such induced vertical alignment. Electrical conductivity of 8CB is observed to increase significantly with the addition of CDs (i.e., an increment of up to two orders of magnitude in composites as compared to pure 8CB) and attributed to the lowering of viscosity and change in molecular alignment. We certainly believe that such tunable molecular alignment throughout SmA and N phases of thermotropic smectogenic liquid crystal material (8CB) by dopant CDs could pave the way forward for their applications in the flexible displays, biosensors, electro-optical memory, and other tunable photonic devices.

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“…29,[31][32][33][34][35] Recently, several research groups have investigated the dispersion of nanoparticles (NPs) in LCs at various concentrations. [36][37][38] Homogeneous dispersion of NPs in LCs develops a long-range anisotropic interaction among them and avoids the development of any elastic deformation or topological defect caused by doping. However, these defects help us to understand the alignment dynamics of LC molecules in the vicinity of NPs.…”

Section: Introductionmentioning

confidence: 99%