Effect of tensile strain rate and elongation on crystalline structure and piezoelectric properties of PVDF thin films

Mohammadi, Behzad; Yousefi, Ali Akbar; Bellah, S. Moemen

doi:10.1016/j.polymertesting.2006.08.003

Cited by 432 publications

(317 citation statements)

References 28 publications

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“…2 shows the load as a function of the penetration depth plot for a 1.5 mm-thick ionogel pellet using a Berkovitch indenter. Ionogels exhibit rather low values of both Vickers Hardness (0.11 AE 0.02 MPa) and elastic modulus (0.935 AE 0.114 MPa) as compared to other gel electrolytes: 26 MPa for PMMA [22] and 35-50 MPa for PVdF-based polymer [23]. The elastic contribution to the loading can be obtained from Fig.…”

Section: Mechanical Characterizationsmentioning

confidence: 96%

Ionogel-based solid-state supercapacitor operating over a wide range of temperature

Nègre

Daffos

Turq

et al. 2016

Electrochimica Acta

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Ionogel A B S T R A C TAn inorganic gel polymer electrolyte based on the confinement of an ionic liquid mixture (1:1 by weight or molar ratio) of N-methyl-N-propylpiperidinium bis(fluorosulfonyl)imide (PIP13FSI) and N-butyl-Nmethylpyrrolidinium bis(fluorosulfonyl)imide (PYR14FSI) into a SiO 2 matrix prepared from a sol-gel method was prepared and further used as electrolyte in an all solid-state supercapacitor. The synthetized ionogel exhibits a high ionic conductivity over a wide temperature range (from 0.2 mS cm À1 at À40 C up to 10 mS cm À1 at 60 C). The ionogel-based supercapacitor using two activated carbon electrodes can be operated over 3 V cell voltage window. Moreover this all solid-supercapacitor shows a capacitance up to 90 F g À1 at room temperature. These encouraging results show the interest of developing such devices, including non-toxic and safer electrolytes, packaging issues and flexible devices development.

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Section: Mechanical Characterizationsmentioning

confidence: 96%

Ionogel-based solid-state supercapacitor operating over a wide range of temperature

Nègre

Daffos

Turq

et al. 2016

Electrochimica Acta

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“…Interestingly, when the temperature is elevated up to 470 K or more, instead of direct transition from R to β phase, γ phase appears in the first place at 2.2% transforming into a perfect γ phase at 4.4% of tensile strain with an energy barrier of 0.07 eV. If strain is further increased and reaches 13.1%, imperfect β phase can be obtained with an energy barrier of 1.0 eV (the imperfection of the β phase can be due to the requirement of polarization process for the transformation 15 ). Therefore, simulation results show that energy barrier for R to γ transition (0.07 eV, blue triangle in Figure 3g) under tension is lower than R to β transition (1 eV, red square in Figure 3g) under tension.…”

Section: Articlementioning

confidence: 99%

Spontaneous High Piezoelectricity in Poly(vinylidene fluoride) Nanoribbons Produced by Iterative Thermal Size Reduction Technique

et al. 2014

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We produced kilometer-long, endlessly parallel, spontaneously piezoelectric and thermally stable poly(vinylidene fluoride) (PVDF) micro- and nanoribbons using iterative size reduction technique based on thermal fiber drawing. Because of high stress and temperature used in thermal drawing process, we obtained spontaneously polar γ phase PVDF micro- and nanoribbons without electrical poling process. On the basis of X-ray diffraction (XRD) analysis, we observed that PVDF micro- and nanoribbons are thermally stable and conserve the polar γ phase even after being exposed to heat treatment above the melting point of PVDF. Phase transition mechanism is investigated and explained using ab initio calculations. We measured an average effective piezoelectric constant as -58.5 pm/V from a single PVDF nanoribbon using a piezo evaluation system along with an atomic force microscope. PVDF nanoribbons are promising structures for constructing devices such as highly efficient energy generators, large area pressure sensors, artificial muscle and skin, due to the unique geometry and extended lengths, high polar phase content, high thermal stability and high piezoelectric coefficient. We demonstrated two proof of principle devices for energy harvesting and sensing applications with a 60 V open circuit peak voltage and 10 μA peak short-circuit current output. (Figure Presented). © 2014 American Chemical Society

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“…According to the literature, the α-phase crystals of PVDF show peaks at 2θ ≈ 17.6 • , 18.3 • , and 19.9 • ; the β-phase crystals at 2θ ≈ 20.6 • ; and the γ-phase crystals at 2θ ≈ 26.8 • . [29][30][31][32] As shown in Figure 1(b), the neat PVDF contained mixed crystals of the α-phase and γ-phase. Filling the PVDF matrix with CCTO@Ni particles (PVDF#0) decreased the peak intensities at 18.3 • and 26.8 • and increased it at 19.9 • .…”

Section: Resultsmentioning

confidence: 95%

Effects of magnetic field treatment on dielectric properties of CCTO@Ni/PVDF composite with low concentration of ceramic fillers

et al. 2015

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Using melt mixing, we produced a ceramic/polymer composite with a matrix of polyvinylidene fluoride (PVDF) and a filler of 5 vol.% Ni-deposited CaCu3Ti4O12 core-shell ceramic particles (CCTO@Ni), and studied its prominent dielectric characteristics for the first. Its phase composition and morphology were analyzed by X-ray diffraction and scanning electron microscopy, respectively. After treating the composite films with various durations of a magnetic field treatment, we compared their dielectric properties. We found that the CCTO@Ni ceramic had a typical urchin-like core-shell structure, and that different durations of the magnetic field treatment produced different distributions of ceramic particles in the PVDF matrix. The dielectric permittivity of the untreated CCTO@Ni/PVDF composite was 20% higher than that of neat PVDF, and it had a low loss tangent. However, only the composite treated for 30 min in the magnetic field had an ultra-high dielectric permittivity of 1.41 × 104 at 10 Hz, three orders of magnitude higher than the untreated composite, which declined dramatically with increasing frequency, accompanied by an insulating-conducting phase transition and an increase in loss tangent. Our results demonstrate that changes in the dielectric properties of PVDF composites with magnetic field treatment are closely related to the percolation effect and interfacial polarization.

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Effect of tensile strain rate and elongation on crystalline structure and piezoelectric properties of PVDF thin films

Cited by 432 publications

References 28 publications

Ionogel-based solid-state supercapacitor operating over a wide range of temperature

Ionogel-based solid-state supercapacitor operating over a wide range of temperature

Spontaneous High Piezoelectricity in Poly(vinylidene fluoride) Nanoribbons Produced by Iterative Thermal Size Reduction Technique

Effects of magnetic field treatment on dielectric properties of CCTO@Ni/PVDF composite with low concentration of ceramic fillers

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