Revisiting the δ-phase of poly(vinylidene fluoride) for solution-processed ferroelectric thin films

Li, Mengyuan; Wondergem, Harry J.; Spijkman, Mark-Jan; Asadi, Kamal; Katsouras, Ilias; Blom, Paul W. M.; Leeuw, Dago M. de

doi:10.1038/nmat3577

Cited by 401 publications

(364 citation statements)

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“…PES claddings of nanoribbons are etched in DCM before XRD measurements in order to eliminate amorphous background arising from the PES cladding, and to increase the signal intensity. In the literature, characteristic peak positions (2θ) of PVDF are tabulated as 17 15,16,20,21 Starting from the PVDF macroscopic slab, we have analyzed change of phase content for all fabrication steps (Figure 3b). The slab includes a minor amount of β (2θ = 20.7°) and R (2θ = 27.8°) phases, and a transition trend to the γ phase is persistent starting from the first step ribbons.…”

Section: Resultsmentioning

confidence: 99%

“…16,20,21,23 Although, γ phase has lower polarity when compared to β phase, its piezoelectric coefficient still stands better than those of other polymers. 17,20 Besides, the higher Curie temperature of γ phase makes it less vulnerable to harsh environmental conditions. Because of the decay of remnant polarization of β phase PVDF and PVDF-TrFE at lower Curie temperatures, these materials are not good candidates for production of thermally stable long endurance devices.…”

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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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Section: Resultsmentioning

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

et al. 2014

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“…3 Ferroelectric polymers are especially attractive as the active medium for data storage, owing to their high flexibility, low cost and simple production protocol. [4][5][6] Ferroelectric memories based on the 3 copolymer poly(vinylidenefluoride-co-trifluoroethylene) (P(VDF-TrFE)) are of particular interest to the organic electronics community due to the excellent processability (i.e. low temperature and from solution).…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric Polarization Induces Electric Double Layer Bistability in Electrolyte-Gated Field-Effect Transistors

Fabiano

Crispin

Berggren

2013

ACS Appl. Mater. Interfaces

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The dense surface charges expressed by a ferroelectric polymeric thin film induce ion displacement within a polyelectrolyte layer, and vice versa. This because the density of dipoles along the surface of the ferroelectric thin film and its polarization switching time matches that of the (Helmholtz) electric double layers formed at the ferroelectric/polyelectrolyte and polyelectrolyte/semiconductor interfaces. This combination of materials allows for introducing hysteresis effects in the capacitance of an electric double layer capacitor. The latter is advantageously used to control the charge accumulation in the semiconductor channel of an organic field-effect transistor. The resulting memory transistors can be written at a gate voltage of around 7 V and read out at a drain voltage as low as 50 mV. The technological implication of this large difference between write and read-out voltages lies in the non-destructive reading of this ferroelectric memory.

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“…Among them, three polar crystal forms exist (β, γ, and δ phases), where β-phase (TTTT) is highly polar compared to the other two phases. The non-polar α-phase (TGTG ′), however, is the most common and thermodynamically stable phase at ambient temperature and pressure [11,12]. The β-phase of PVDF is responsible for its electroactive properties such as ferroelectric, piezoelectric, and pyroelectric properties.…”

Section: Introductionmentioning

confidence: 99%

Surface morphology and beta-phase formation of single polyvinylidene fluoride (PVDF) composite nanofibers

Ghafari

Jiang

Lü

2017

Adv Compos Hybrid Mater

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This study has developed a reliable model to design and engineer PVDF nanofiber in terms of both morphological and fraction of beta-phase content based on response surface methodology (RSM). The model was further used to assess the effect of each individual electrospinning processing parameter as well as their interdependences on the properties of electrospun PVDF nanofibers. Our experimental results highly agreed with the modeling. The results indicated that both morphological and crystalline properties of PVDF are highly affected by electrospinning process parameters, particularly the fraction of betaphase content. A beadless PVDF nanofiber with the maximum fraction of the beta phase was achieved through a numerical optimization process.

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Revisiting the δ-phase of poly(vinylidene fluoride) for solution-processed ferroelectric thin films

Abstract: Revisiting the delta-phase of poly(vinylidene fluoride) for solution-processed ferroelectric thin films Li, Mengyuan; Wondergem, Harry J.; Spijkman, Mark-Jan; Asadi, Kamal; Katsouras, Ilias; Blom, Paul W. M.; de Leeuw, Dago M.

Cited by 401 publications

References 42 publications

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

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

Ferroelectric Polarization Induces Electric Double Layer Bistability in Electrolyte-Gated Field-Effect Transistors

Surface morphology and beta-phase formation of single polyvinylidene fluoride (PVDF) composite nanofibers

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