Effects of Gamma Irradiation on Polyvinylidene Fluoride Thin Films

Madivalappa, Shivaraj; Jali, V. M.

doi:10.1088/1757-899x/310/1/012074

Cited by 5 publications

(1 citation statement)

References 18 publications

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“…The optical bandgap for the Yb-PVDF film was 24% higher on average compared to the PVDF film, possibly because ytterbium increased the space charge interaction, generated changes in the electronic mobility. Yb-doping in PVDF films increases the density of localized states in the bandgap and reduces the Fermi level, where the values of the direct bandgap are larger than the corresponding values of the indirect bandgap [57]. For PVDF+0.5% carbon nanotubes, the bandgap was 5.95 eV [58].…”

Section: Optical Bandgapmentioning

confidence: 99%

Ytterbium-doping effect on the electrochemical and piezoelectric properties of poly(vinylidene fluoride) films

Perdigon-Lagunes,

Estevez,

Zorrilla-Cangas

et al. 2024

Mater. Res. Express

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The optimal molar ratio of poly(vinylidene fluoride) (PVDF): dimethyl sulfoxide (DMSO) was investigated that promoted the β-phase formation, used during the PVDF film synthesis. The solution cast method was used for doping the PVDF films with 1.5% w/v ytterbium (III) nitrate salt hexahydrate. In general, Yb-doping in PVDF films improves thermal resistance, promotes β-phase formation, modifies the monomer conformation, reduces reversibility to electrochemical processes, and increases the d33 coefficient of piezoelectricity. The β-phase formation caused by Yb-doping alters the internal structures of the trans-gauche-trans-gauche' (TGTG') and all-trans (TTTT) chains inside the polymeric network. The coexistence between the trans-gauche and all-trans structures provides in both films the α-phase and β-phase coexistence. The presence of self-polarized CH2-CF2 dipoles, where the concentration of fluorine remains the same and the CH2 drastically increases after Yb3+ incorporation. The quasi-reversible shape shown in both voltammetry cyclic curves is related to irreversible oxidation and reduction reactions. Yb-PVDF exhibits specific pseudocapacitance values that are 30% higher than those of the PVDF films. Finally, the piezoelectric properties were improved with ytterbium incorporation.

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Section: Optical Bandgapmentioning

confidence: 99%

Ytterbium-doping effect on the electrochemical and piezoelectric properties of poly(vinylidene fluoride) films

Perdigon-Lagunes,

Estevez,

Zorrilla-Cangas

et al. 2024

Mater. Res. Express

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Dielectric Properties of γ‐Iirradiated, Stretched, and Poled PVDF Thin Films

Madivalappa

Jali

Jain

2019

Macromolecular Symposia

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The effects of γ‐irradiation on the dielectric properties of stretched and poled polyvinylidene fluoride thin films synthesized by solvent cast method are reported. The films are subjected to γ‐irradiation with different doses (25, 50, and 75 kGy). XRD pattern is obtained to identify the presence of α/β phases. Dielectric constant and loss values of the stretched and poled films have been measured, before and after irradiation, and their nature of variation has been studied. β phase is retained even after the irradiation thereby confirming that the radiation damage is not significant. The dielectric loss is minimum in the frequency range 102 to104 Hz, giving the preferable frequency range of operation for devices

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