The scientific duo of TiO2 nanoparticles and nematic liquid crystal E204: Increased absorbance, photoluminescence quenching and improving response time for electro-optical devices

Singh, Bhupendra Pratap; Huang, Chi Yen; Singh, Dharmendra Pratap; Palani, Parthiban; Duponchel, B.; Sah, Meeta; Manohar, Rajiv; Pandey, Kamal Kumar

doi:10.1016/j.molliq.2020.115130

Cited by 26 publications

(30 citation statements)

References 58 publications

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“…The presence of MWCNTs in the E7 LC has significantly decreased the τ o f f due to the reduced γ and V th . Notably, MWCNT doping decreases τ o f f and K 11 and hence γ, which confirms the conjecture of Equations ( 8) and (10). It is really interesting to explore the reason that why the presence of MWCNTs remarkably reduces the switching time of nematic molecules.…”

supporting

confidence: 81%

“…Then, 5 µm-thick cells, composed of two indium tin oxide (ITO) glass substrates, were constructed. The detailed process of sample cell fabrication could be obtained in our previous articles [10,32]. The cell thickness was estimated via the optical interferometry and found to be ∼5.3 ± 0.05 µm.…”

Section: Methodsmentioning

confidence: 99%

“…The response time was calculated by using an optical switching technique of the pure E7 and LC-MWCNT composites at room temperature (RT). Experimental setup and measurement techniques for voltage dependent transmission curve (V-T curve) and response time have already been reported in our previously published articles [10,32]. Crystal rotation method [35] was used to calculate the pre-tilt angles of the homogeneously (HA or ECB) and vertically aligned (VA) LC cells filled with the pure E7 and LC-MWCNT composites.…”

Section: Methodsmentioning

confidence: 99%

“…The concept of Guest-Host mode has been proposed to enhance the physical properties of the pristine LCs [9]. With this consideration, the coupling of nanotechnology with that of the soft condensed mesogens (i.e., LC-nanomaterial composites) have drawn a significant interest from researchers for obtaining superior display and nano-display applications [10].…”

Section: Introductionmentioning

confidence: 99%

“…It is really interesting to explore the reason that why the presence of MWCNTs remarkably reduces the switching time of nematic molecules. For a planar cell, the response of nematic director under an external applied field could be understood by Equations ( 8)- (10). These equations express the field-induced nematic switching, which is not only the optical response.…”

mentioning

confidence: 99%

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Carbon Nanotubes Blended Nematic Liquid Crystal for Display and Electro-Optical Applications

Singh

Sikarwar

Pandey³

et al. 2021

Electronic Materials

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In this paper, we investigate a commercial nematic liquid crystal (LC) mixture namely E7 dispersed with small concentrations of multi-walled carbon nanotubes (MWCNTs). The dielectric and electro-optical characterizations have been carried out in the homogeneously and vertically aligned LC cells. The electro-optical response of LC molecules has been enhanced by 60% after the addition of MWCNTs, which is attributed to the reduced rotational viscosity in the composites. MWCNTs act like barricades for ionic impurities by reducing them up to ∼34.3% within the dispersion limit of 0.05 wt%. The nematic–isotropic phase transition temperature (TNI) of the E7 LC has also been shifted towards the higher temperature, resulting in a more ordered nematic phase. The enhanced birefringence and orientational order parameter in the LC-MWCNTs are attributed to π-π electron stacking between the LC molecules and the MWCNTs. The outlined merits of the LC-MWCNTs composites evince their suitability for ultrafast nematic-based electro-optical devices.

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supporting

confidence: 81%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Carbon Nanotubes Blended Nematic Liquid Crystal for Display and Electro-Optical Applications

Singh

Sikarwar

Pandey³

et al. 2021

Electronic Materials

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Greenly synthesized porous carbon nanoparticle (bio‐waste‐based)‐doped nematic liquid crystal composite with optimized electric and electro‐optical properties for devices

et al. 2022

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The present investigation on the impact of porous carbon nanoparticles (PCNPs) on a room temperature nematic liquid crystalline compound (TP‐188‐01) reports extensive electro‐optical analysis of composite followed by dielectric and luminescence study as well. The pure nematic compound has been doped with 0.1%, 0.25%, and 0.5% of PCNPs (spherical), which have been synthesized by green synthesis technique without use of any activating agents. Low‐frequency dielectric analysis (50 Hz to 1 kHz) has been done to confirm ion generation with increase in PCNS concentration. The dielectric data also indicate preferential orientation of molecules from homogeneous to homeotropic alignment, which can be used in performance optimization of electro‐optical devices. The analysis of dielectric data also illustrates the application of PCNS‐doped systems in circuits operating at high voltages. Diffusion coefficient, mobility, and DC conductivity have been further examined to support the above observations. A significant decrease (of about 47%) in the response time of porous carbon nanoparticle liquid crystal (NP‐LC) composites has also been observed. The photoluminescence spectrum of NP‐LC composites as a function of carbon nanosphere (CNS) concentration has shown Quenching (following the Stern–Volmer quenching mechanism) in the luminescence intensity with increasing CNS concentration. The highly improved response time and quenching in the luminescence intensity further make the PCNS‐doped LC composites as ideal materials to be used in devices, encouraging LC‐aided green nanotechnology.

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Electro-optical and dielectric response of quantum dot-doped cholesteric liquid crystal composites

Kocakülah

Köysal

2022

J Mater Sci: Mater Electron

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The scientific duo of TiO2 nanoparticles and nematic liquid crystal E204: Increased absorbance, photoluminescence quenching and improving response time for electro-optical devices

Cited by 26 publications

References 58 publications

Carbon Nanotubes Blended Nematic Liquid Crystal for Display and Electro-Optical Applications

Carbon Nanotubes Blended Nematic Liquid Crystal for Display and Electro-Optical Applications

Greenly synthesized porous carbon nanoparticle (bio‐waste‐based)‐doped nematic liquid crystal composite with optimized electric and electro‐optical properties for devices

Electro-optical and dielectric response of quantum dot-doped cholesteric liquid crystal composites

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