The effect of Li4Ti5O12nanoparticles on structural, linear and third order nonlinear optical properties of PVDF films

El-Metwally, E.G.; Nasrallah, Doaa A.; Fadel, M.

doi:10.1088/2053-1591/ab1efb

Cited by 19 publications

(19 citation statements)

References 49 publications

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“…The value of W m for pure PVDF was 1.129 eV and decreased to 0.912 eV at RT for the sample containing 1.0 vol% LTO. These results are in agreement with the increase in the ac conductivity σ ac ( ω ) and the decrease in the optical band gap

E_{g}^{opt}

, which was fully discussed in our previous work 23 …”

Section: Resultssupporting

confidence: 93%

“…The relative fraction of the β‐phase in pure PVDF and PVDF/LTO PNC is calculated from Beer‐Lambert's law using the corresponding areas of the characteristic β‐phase peaks in the FTIR spectra and XRD diffraction patterns 31,32 . Detailed analysis of FTIR and XRD for PVDF/LTO PNC was discussed in our previous work, which was concerned with the linear and nonlinear optical properties of the investigated samples 23 . Herein, the region of interest belonging to the β‐phase of PVDF/LTO PNC in FTIR and XRD spectra is shown in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

“…Several articles recommended using nanosized forms of LTO for new anode materials in the secondary lithium‐ion batteries due to its advantages of particle size confinement in electrochemical applications 20‐22 . The impact of LTO NPs on the linear and nonlinear optical properties of PVDF/LTO PNC was extensively studied before in previous work 23 . To the best of our knowledge, doping of LTO NPs in the PVDF polymer matrix and its dielectric properties has never been reported.…”

Section: Introductionmentioning

confidence: 99%

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Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Nasrallah

El-Metwally

Ismail

2020

Polymers for Advanced Techs

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Polymer nanocomposites consisting of materials such as ionic polymers and nano‐ceramic fillers are widely used in high‐power lithium‐polymer batteries because of their high ionic conductivity, good mechanical strength, electrothermal stability, and better compatibility with electrodes. Nanocomposite films of polyvinylidene fluoride (PVDF)/lithium titanium oxide Li4Ti5O12 (LTO) with different volume fractions of LTO nanoparticles (NPs) are prepared via casting method. The DSC thermograms revealed a slight decrease in the melting temperature Tm and a noticeable reduction in the degree of crystallinity with increasing the volume fraction of LTO. This decrease is confirmed by the increment in the relative fraction of β‐phase in the PVDF matrix calculated from both XRD and FTIR. SEM images indicated the growth of porous globular structures in the presence of LTO NPs. Besides, the hydrophilicity of PVDF is improved by incorporating LTO NPs. The dielectric constant ε′(ω), loss ε″(ω), ac conductivity σac(ω), complex impedance Z*(ω), and Nyquist plots of PVDF/LTO nanocomposites are investigated in the temperature range from 303 to 413 K and frequency range from 100 Hz to 1 MHz. The σac(ω) and frequency exponent s are found to obey the correlated barrier hopping model. Values of the frequency exponent s and the charge carriers binding energy Wm for the studied nanocomposite films decrease with rising temperature and LTO addition. Furthermore, dielectric constant ε′(ω), loss ε″(ω), and ac electrical conductivity σac(ω) of films are found to be strongly frequency and temperature dependent. The localized states density N(EF) at the Fermi level increase with increasing temperature and LTO NPs volume fraction, resulting in the Wm decrease and the enhancement of the ac electrical conductivity σac(ω). The impedance spectrum and Nyquist plots provide an insight into the influence of LTO vol% in the resistive and capacitive characteristics of PVDF/LTO films. These results recommend the choice of LTO NPs as dopants to enhance the electrical properties of the PVDF matrix to be used in high‐power lithium‐ion batteries and electronic devices.

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E_{g}^{opt}

, which was fully discussed in our previous work 23 …”

Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Nasrallah

El-Metwally

Ismail

2020

Polymers for Advanced Techs

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“…The AC electrical studies were obtained via utilizing programmable automatic (Model: Hioki-3531Z Hitester) in the range from 10 À1 to 10 7 Hz. The samples temperatures were examined via thermocouple at 303, 323, 343, and 363 K. 9,27,28 According to Scherrer's formula, 29 the average crystallite size (D) of Li 4 Ti 5 O 12 NPs was calculated:…”

Section: Characterization Apparatusmentioning

confidence: 99%

Structural, optical, thermal, and dielectric properties of carboxymethyl cellulose/sodium alginate blend/lithium titanium oxide nanoparticles: Biocomposites for lithium‐ion batteries applications

Abdallah

Morsi

Asnag

et al. 2022

Intl J of Energy Research

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Summary Nanocomposites samples of carboxymethyl cellulose (CMC)/sodium alginate (SA) blend (70/30 wt%)‐loaded lithium titanium oxide nanoparticles (Li4Ti5O12 NPs) were prepared using the casting method. X‐ray diffraction (XRD) spectra showed a decrease of the crystallinity with increasing Li4Ti5O12 concentrations. Fourier‐transform infrared (FT‐IR) inferred the interaction and complexation between the blend components (CMC/SA), also showed the interaction between Li4Ti5O12 and the functional groups of CMC/SA in particular CHOCH2 stretching, COO− stretching, and OH stretching vibrations. The optical properties of samples enhanced in optical energy gap as the concentration of Li4Ti5O12 increased. The differential scanning calorimetry (DSC) measurement showed that the pure sample has a single glass transition temperature (Tg), which denoted that the blend components were miscible. Also, DSC showed an enhancement in the thermal stability of polymeric blend after the addition of Li4Ti5O12. The highest value of AC conductivity was noticed at the highest concentration of Li4Ti5O12, which was also increased with increasing temperature. The maximum electrical conductivity obtained at 0.40 wt% of Li4Ti5O12 in the polymeric matrix is 9.35 × 10−6 S/cm at room temperature at 107 Hz. The complex permittivity (ε*) was decreased with the increase of both Li4Ti5O12 content and the temperature degree. At high frequencies, the decreasing trend of permittivity was assigned to dipoles orientation. These results indicated that CMC/SA/Li4Ti5O12 nanocomposites would be promising for energy storage capacitors applications and alternative separator rechargeable lithium‐ions batteries industries.

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“…There are also some studies conducted on the optics properties of PVDF, PVDF-copolymers, PVDF-Blends and PVDF-nanocomposites, for its quite large optical windows (200~1200 nm), good linear and non-linear optical (NLO) properties. The well-known applications of PVDF-nanocomposites are used for optical frequency conversion materials, memory and limiting devices [22][23][24][25][26], which are doped with nanoparticles, such as ZnO [27], CuO [28], ZrO 2 [29], HfO 2 [30], reduced graphene oxide (RGO) [31,32], Carbon Nanotubes [33,34], Carbon Quantum Dots [35], cellulose [36], Li 4 Ti 5 O 12 [37], and so on.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Optical Properties of Transparent P(VDF-TrFE) Ultrathin Films

Liu

Lin

et al. 2022

Nanomaterials

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The films of vinylidene fluoride and trifluoroethylene (P(VDF-TrFE)) are widely used in piezoelectric tactile sensors, vibration energy harvesters, optical frequency conversion materials and organic photo-voltaic device because of high electroactive, good optical and nonlinear optical properties, respectively. In this work, the multilayer structured ultrathin films were fabricated by the Langmuir–Blodgett technique, and the thickness per layer can be controlled accurately. It was found that as the collapse pressure of P(VDF-TrFE) (25:75) and the optimal dipping value are 65~70 mN/m and 15 mN/m, respectively, a high-density film can be obtained due to the compression of molecules. The surface topography and optical properties of the LB films were characterized by X-ray diffraction, white light interferometer and variable-angle spectrum ellipsometer. It was observed that the films are transparent in the visible region and IR-band, but show a high absorption in the UV band. Besides, the transmittance of the films ranges from 50% to 85% in the visible region, and it linearly decreases with the number of monolayers. The average thickness of per deposition layer is 2.447, 2.688 and 2.072 nm, respectively, under three measurement methods. The calculated refractive index ranged from 1.443 to 1.598 (600~650 nm) by the Cauchy-model.

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The effect of Li₄Ti₅O₁₂nanoparticles on structural, linear and third order nonlinear optical properties of PVDF films

Cited by 19 publications

References 49 publications

Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Structural, optical, thermal, and dielectric properties of carboxymethyl cellulose/sodium alginate blend/lithium titanium oxide nanoparticles: Biocomposites for lithium‐ion batteries applications

Fabrication and Optical Properties of Transparent P(VDF-TrFE) Ultrathin Films

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The effect of Li4Ti5O12nanoparticles on structural, linear and third order nonlinear optical properties of PVDF films

Cited by 19 publications

References 49 publications

Structural, thermal, and dielectric properties of porous PVDF/Li4Ti5O12 nanocomposite membranes for high‐power lithium‐polymer batteries

Structural, thermal, and dielectric properties of porous PVDF/Li4Ti5O12 nanocomposite membranes for high‐power lithium‐polymer batteries

Structural, optical, thermal, and dielectric properties of carboxymethyl cellulose/sodium alginate blend/lithium titanium oxide nanoparticles: Biocomposites for lithium‐ion batteries applications

Fabrication and Optical Properties of Transparent P(VDF-TrFE) Ultrathin Films

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Product

Resources

About

The effect of Li₄Ti₅O₁₂nanoparticles on structural, linear and third order nonlinear optical properties of PVDF films

Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries