In Situ Measurement of Dielectric Permittivity and Electrical Conductivity of CoCl2/BaCl2 Doped PVDF Composite at Elevated Temperature

Gaur, Anshu; Rana, Dinesh Singh

doi:10.1007/s10904-019-01126-y

Cited by 23 publications

(6 citation statements)

References 32 publications

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“…The peak current of GC after modification by PVDF-PEI increased (Figure 6B(b),C(b)) because PVDF is a conductive material. 55 After conjugation of Anti-METH, peak currents decreased (Figure 6B(c),C(c)) because the limitation barrier was formed for mediator transport. Then, METH was added as a target analyte and the peak currents decreased proportionally to its concentration (Figure 6B(d),C(d)).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Antibody-Conjugated Electrospun Nanofibers for Electrochemical Detection of Methamphetamine

Atik

Kilic

Horzum

et al. 2023

ACS Appl. Mater. Interfaces

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Multifunctional electrospun nanofibers (ENs) with improved properties have increased attention nowadays. Their insoluble forms in water with decreased hydrophobicity are desired for the immobilization of biological molecules. Also, the addition of functional groups on the backbone provides the conjugation of biomolecules onto the surface of ENs via covalent bonds to increase their stability. Here, poly(vinylidene fluoride) (PVDF) was chosen to prepare a platform, which is insoluble in water, and polyethylenimine (PEI) was used to add amine groups on the surface of ENs to bind biological molecules via covalent conjugation. So, PVDF-PEI nanofibers were prepared on a glassy carbon electrode to immobilize an antimethamphetamine antibody (Anti-METH) as a model biomolecule. The obtained PVDF-PEI/Anti-METH was used for the bioelectrochemical detection of methamphetamine (METH), a common illicit drug. Bioelectrochemical detection of METH on PVDF-PEI/Anti-METH-coated electrodes was carried out by voltammetry in the range of 2.0–50 ng/mL METH. Moreover, the effect of dansyl chloride (DNC) derivatization of METH on the sensitivity of PVDF-PEI/Anti-METH was tested. Finally, METH analysis was carried out in synthetic body fluids. The obtained results showed that PVDF-PEI ENs can be adopted as an immobilization matrix for the biorecognition elements of biobased detection systems, and the derivative of METH (METH-DNC) increased the sensitivity of PVDF-PEI/Anti-METH.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Antibody-Conjugated Electrospun Nanofibers for Electrochemical Detection of Methamphetamine

Atik

Kilic

Horzum

et al. 2023

ACS Appl. Mater. Interfaces

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“…Two distinctive diffraction peaks at 19.24°, and 23.35° belonging to PEO which exhibits crystalline segment and these two maxima are attributed to the crystal planes (1 2 0) and (1 1 2) of the monoclinic crystal structure of PEO [9]. There are two significant low intensity peaks located at 20.53° and 36.32° in the NPCE films, which belong to the β phase and α phase of PVDF, respectively [37]. This confirms the polymorphism of PVDF [38].…”

Section: Xrd Studiesmentioning

confidence: 97%

Effect of TiO2 Nano-Filler on Electrical Properties of Na+ Ion Conducting PEO/PVDF Based Blended Polymer Electrolyte

Ganta¹,

Jeedi²,

Katrapally

et al. 2021

J Inorg Organomet Polym

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Nanocomposite Polymer Electrolyte (NCPE) films based on a blend of two polymers poly (ethylene oxide) (PEO) and poly (vinylidene fluoride) (PVDF) complexed with sodium perchlorate (NaClO4) salt and Nano-filler Titanium dioxide (TiO2) (i.e., (80wt%PEO/20wt%PVDF) + 7.5wt%NaClO4+ xwt%TiO2 where x = 3, 6, 9, 12, 15, and 18) were prepared and characterized as potential candidates for battery applications.Electrochemical Impedance Spectroscopy (EIS) has been employed between the frequencies 10 Hz and 4 MHz to investigate electrical, dielectric and electric modulus properties of the prepared NCPE films. Effect of TiO2 Nano-filler concentration on the structural, ionic conductivity, and dielectric relaxation has been studied. The AC conductivity of the NCPE films at high frequencies obeys Jonscher's power law. The values of DC ionic conductivity calculated by fitting the AC conductivity spectra to the best fit of Joncher's power law are consistent with the values of DC ionic conductivity calculated from the bulk resistance (Rb) of the NCPE films. The ionic conductivity that depends on temperature follows the Arrhenius rule between the temperatures 298 K and 328 K. The maximum ionic conductivity at ambient temperature 8.75x10 -5 S/cm was obtained for (80wt%PEO/20wt%PVDF) +7.5wt%NaClO4 +15wt%TiO2 NCPE film and it is attributed to the decrease in crystallinity. Using Wagner's polarization technique ionic transport numbers of various NCPE films were measured.

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“…These can be measured using the capacitance (

C

) measured in parallel plate configuration and the tangent loss (

\tan (δ)

) of the material, respectively. The values of

ε_{r}

and

ε_{i}

of representative films was calculated using Equations () and (), respectively 50,51

ε_{r} = \frac{italicCd}{ε_{0} A}

ε_{i} = ε_{r} \tan (δ)

where

d

is the thickness of the film,

ε_{0}

is the permittivity of free space (8.85 × 10 −12 F/m),

A

is the contact area. The dielectric constant of the films under study, were found to increase with the increase in the filler concentrations across the entire frequency range, as shown in Figure 6A, with the pristine film showing the lowest values.…”

Section: Resultsmentioning

confidence: 99%

“…These can be measured using the capacitance (C) measured in parallel plate configuration and the tangent loss ( tan δ ð Þ) of the material, respectively. The values of ε r and ε i of representative films was calculated using Equations ( 3) and ( 4), respectively 50,51 F I G U R E 5 (A) Fourier transformed infrared spectra for the representative pure and composite films of cellulose/ poly(vinylidene fluoride) films between 400 and 1500 cm À1 and (B) fraction of electroactive phase versus filler concentration…”

Section: Dielectric Studiesmentioning

confidence: 99%

Enhanced dielectric properties of freestanding, flexible, hydrophobic cellulose/poly(vinylidene fluoride) composite films

Jangra

Thakur

Dam

et al. 2022

Journal of Polymer Science

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Freestanding, composite films of poly(vinylidene fluoride) (PVDF) and cellulose were synthesized and characterized for morphological, microstructural, vibrational and dielectric properties. The thickness of the freestanding films was found to be $38 μm. Contact angle measurements showed the hydrophobic nature of the composite films. Fourier transformed infrared (FTIR) spectroscopy confirmed the reduction in the α phase content of the PVDF films with the addition of fillers. The measured dielectric constant of the composite films was found to be more than two times than that of the pristine films. An increase in the dielectric constant of the composite films was attributed to the Maxwell-Wagner-Sillars (MWS) polarization. A triboelectric nanogenerator (TENG) operating in a vertical contact-separation configuration was fabricated using these composite films. A maximum output power density of $6 μW/cm 2 was achieved from the TENG fabricated using the composite films.

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In Situ Measurement of Dielectric Permittivity and Electrical Conductivity of CoCl2/BaCl2 Doped PVDF Composite at Elevated Temperature

Cited by 23 publications

References 32 publications

Antibody-Conjugated Electrospun Nanofibers for Electrochemical Detection of Methamphetamine

Antibody-Conjugated Electrospun Nanofibers for Electrochemical Detection of Methamphetamine

Effect of TiO2 Nano-Filler on Electrical Properties of Na+ Ion Conducting PEO/PVDF Based Blended Polymer Electrolyte

Enhanced dielectric properties of freestanding, flexible, hydrophobic cellulose/poly(vinylidene fluoride) composite films

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