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

Pathak, Govind; Pandey, Shivani; Katiyar, Rohit; Srivastava, Atul; Dąbrowski, R.; Garbat, K.; Manohar, Rajiv

doi:10.1016/j.jlumin.2017.06.021

Cited by 48 publications

(11 citation statements)

References 42 publications

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“…The emission band of TiO 2 NPs is much closer to the emission band of D5AOB molecules, so the increased value of PL intensity of doped system may be due to constructive combination of emission of TiO 2 NPs and NLC molecules. In the spectral region, a secondary peak is also observed in all doped systems except pure one and is due to self-activated PL center [36]. The FTIR spectra of pure NLC and its composite systems have been shown in Fig.…”

Section: Resultsmentioning

confidence: 88%

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Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

et al. 2018

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In the present investigation, TiO 2 -doped weakly polar nematic liquid crystal (NLC) has been studied. This study mainly focuses on dielectric, electro-optical and optical properties of pure NLC and doped systems. Variation in different parameters like dielectric permittivity, dielectric loss, dielectric anisotropy and conductivity has been noticed. Permittivity of the doped system is almost the same as undoped system. With doping concentration, the ionic contribution to the dielectric loss as observed in low-frequency region has been suppressed and the shift in relaxation frequency toward higher frequency side has also been observed. The electrical conductivity and threshold voltage have been decreased with increasing concentration of nanoparticles (NPs). The continuous increase in dielectric anisotropy with increasing the concentration of NPs has also been observed. These results have been attributed to the trapping capability of free ions by TiO 2 NPs. Further, we focused on the study of photoluminescence (PL), UV absorbance and Fourier transformed infrared spectroscopy (FTIR) of pure and doped systems. The continuous increase in PL intensity without any shift in emission peak has been observed for doped systems. Enhancement in UV absorbance with increasing concentration of NPs has also been observed. The effect of NPs doping on molecular dynamics of NLC can be clearly seen by FTIR study. The results suggest that the TiO 2 NP-doped weakly polar NLC can have significant improved dielectric, electro-optical and optical properties. This makes the weakly polar NLC to be a potential candidate for many applications.

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Section: Resultsmentioning

confidence: 88%

“…Photoluminescence behavior of NLC doped with TiO 2 NPs has been studied by Roy et al [35], and the enhanced PL intensity for the doped system has been reported. Pathak et al [36] observed the induced photoluminescence behavior in TiO 2 NP-doped NLC system.…”

Section: Introductionmentioning

confidence: 99%

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

et al. 2018

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“…Figure 5 illustrates the Tauc plots of both experimental thin films, in which the dotted lines intercepted the x-axis (hν-intercept) at 3.19 and 3.22 eV for the SG-TiO 2 and SP-TiO 2 thin films, respectively. The findings indicated that the bandgap energies of both thin films were in the range of anatase TiO 2 [20,21].…”

Section: Physical Characteristics Of the Sg-and Sp-tio 2 Thinmentioning

confidence: 94%

E. coli Bacteriostatic Action Using TiO₂ Photocatalytic Reactions

Rojviroon

Sirivithayapakorn

2018

International Journal of Photoenergy

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This experimental research comparatively investigates the Escherichia coli (E. coli) bacterial inactivation of the TiO 2 photocatalytic thin films fabricated by the sol-gel dip-coating (SG) and low-temperature spray-coating (SP) techniques, with low-intensity (12 μW·cm . Moreover, the essential physical characteristics of the SG-TiO 2 and SP-TiO 2 photocatalytic thin films were determined prior to the experimental bacterial inactivation. The findings showed that both photocatalytic thin films possessed the ideal physical characteristics, especially the SP-TiO 2 thin film. In addition, the viable cell counts, the cell morphology, and the bioluminescence-based adenosine triphosphate (ATP) indicated that both SG-TiO 2 and SP-TiO 2 thin films under UVA could effectively inhibit the proliferation of the E. coli cells in both NB and 0.85% NaCl.

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“…Lumin. 192 (2017) In mid-2017, Pathak et al reported optical and electrical properties of TiO 2 naoparticles dispersed nematic liquid crystals [1]. But the authors calculated optical band gap of the materials using unscientific and wrong technique, and also they didn't record photoluminescence spectrum of nematic liquid crystals carefully.…”

mentioning

confidence: 99%

“…3 of ref. [1], authors represented photoluminescence behavior of pure and TiO 2 nanoparticles dispersed nematic liquid crystals and they wrote just photoluminescence in Y-axis. Authors should write in Y-axis as photoluminescence intensity along with unit (arbitrary unit).…”

mentioning

confidence: 99%

Comment to the article “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 (2017) 33–39]

Roy

2018

Journal of Luminescence

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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

Cited by 48 publications

References 42 publications

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

E. coli Bacteriostatic Action Using TiO₂ Photocatalytic Reactions

Comment to the article “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 (2017) 33–39]

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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

Cited by 48 publications

References 42 publications

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

E. coli Bacteriostatic Action Using TiO2 Photocatalytic Reactions

Comment to the article “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 (2017) 33–39]

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E. coli Bacteriostatic Action Using TiO₂ Photocatalytic Reactions