Preparation of PVDF flexible piezoelectric film with high β-phase content by matching solvent dipole moment and crystallization temperature

Li, Xiongjie; Wang, Yiping; He, Tingrui; Hu, Querui; Yang, Ying

doi:10.1007/s10854-019-02400-y

Cited by 32 publications

(29 citation statements)

References 37 publications

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“…In general, materials that contain a large number of dipole moments that align along the applied electric field are considered ferroelectric materials, and this ferroelectric property is a necessary condition for fabricating piezoelectric materials. 29,30 The P−E curves of the PRX elastomers were determined to evaluate and compare their ferroelectric properties. As shown in Figure 3a−c, ePR10k 75 35k 25 shows the highest remnant polarization (P r ) value under the different applied alternative electric fields (0.1, 1, and 10 Hz).…”

mentioning

confidence: 99%

“…However, the primary aim of the study was to effectively align the dipole moments through the formation of long-range-ordered crystalline structures. In general, materials that contain a large number of dipole moments that align along the applied electric field are considered ferroelectric materials, and this ferroelectric property is a necessary condition for fabricating piezoelectric materials. , …”

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confidence: 99%

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Optimization of Anisotropic Crystalline Structure of Molecular Necklace-like Polyrotaxane for Tough Piezoelectric Elastomer

Seo

Kim

et al. 2021

ACS Macro Lett.

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While piezoelectric materials are applied in various fields, they generally exhibit poor mechanical toughness. To increase the applicability of these, their mechanical properties need to be improved. In this study, a tough piezoelectric polyrotaxane (PRX) elastomer was developed by blending PRX samples of two different lengths, formed using 10K and 35K poly(ethylene glycol), to align dipole moments for optimization of the piezoelectricity characteristics. The effects of the blending ratio on the crystalline structure of the obtained PRX elastomer were investigated by X-ray diffraction analysis and transmission electron microscopy. In addition, the ferroelectric and piezoelectric properties of the PRX elastomer were evaluated based on its polarization hysteresis loop and voltage generation characteristics, respectively. The PRX elastomer formed by using a ratio of 3:1 (ePR10k7535k25) exhibited a long-range-ordered anisotropic crystalline structure, resulting in a large polarization (P r) value. As a result, ePR10k7535k25 showed greatly enhanced piezosensitivity against the mechanical vibrations generated by respiratory signals.

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confidence: 99%

mentioning

confidence: 99%

Optimization of Anisotropic Crystalline Structure of Molecular Necklace-like Polyrotaxane for Tough Piezoelectric Elastomer

Seo

Kim

et al. 2021

ACS Macro Lett.

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“…Due to their strong intermolecular interactions, few solvents can adequately dissolve the PVDF, or in a reasonable time [91]. Furthermore, once dissolved, PVDF tends to crystallize in its non-polar α phase, which is the most thermodynamically stable [58,59,87]. Nonetheless, the possibility of inducing phase transitions using high polar solvents has been observed [59,61,62,65,92,93].…”

Section: Pvdf Ink Formulationmentioning

confidence: 99%

“…Furthermore, once dissolved, PVDF tends to crystallize in its non-polar α phase, which is the most thermodynamically stable [58,59,87]. Nonetheless, the possibility of inducing phase transitions using high polar solvents has been observed [59,61,62,65,92,93]. In particular, N-methyl-2-pyrrolidone (NMP) and N, N-dimethylformamide (DMF) are the most used solvents, although they are expensive and have a high environmental impact [55,[94][95][96][97].…”

Section: Pvdf Ink Formulationmentioning

confidence: 99%

“…Semi-crystalline PVDF exhibits several phases, whose relative quantity strongly depends on film processing [2,8,[53][54][55]. Among these, γ, and even more so, β polar phases are mostly recognized for providing a pyroelectric response [2,8,54,[56][57][58][59][60], but they are thermodynamically less stable than the non-polar α phase and difficult to obtain [58,59,61]. Moreover, to achieve pyroelectric operation in PVDF films, a macroscopic polarization process must be performed to obtain the alignment of polarized covalent bonds in the polar phases [2,8,51].…”

Section: Introductionmentioning

confidence: 99%

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Gravure Printing for PVDF Thin-Film Pyroelectric Device Manufacture

et al. 2022

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Pyroelectric energy harvesting is one of the more recent and promising solid-state approaches for directly converting time-dependent temperature fluctuations into electric energy. Conventional printing technologies can offer many advantages for the production of pyroelectric thin-film-based devices, such as low cost, low temperature, the use of flexible substrates and shaping at the same time as deposition. Nevertheless, some issues related to low printed thickness and film-forming microstructure control need to be addressed. In this exploratory study, the possibility of exploiting the highly attractive gravure printing process for the potential industrial manufacture of flexible polyvinylidene fluoride (PVDF) thin-film pyroelectric devices was investigated. By the use of corona pre-treatment of the printing substrate and low-temperature polar solvent evaporation, multilayer gravure-printed PVDF pyroelectric devices were successfully manufactured for the first time, achieving a maximum generated current of 0.1 nA at 2.5 K/s from a device with an active area of 1 cm2. Considering the very low thermal inertia and performance scaling by the area expected for pyroelectric thin-film-based devices, combined with the upscaling potential of roll-to-roll gravure printing, our results provide new opportunities for on-demand, low-cost pyroelectric device manufacture and their integration in hybrid harvesters.

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Volumetric 3D‐Printed Piezoelectric Polymer Films

Frick,

van Vliet,

Žukauskaitė

et al. 2024

Adv Materials Technologies

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A novel additive manufacturing route using a tailored resin containing Poly(vinylidene fluoride) Trifluoroethylene (PVDF‐TrFE) to 3D print piezoelectric films is demonstrated. Piezoelectric films are printed within 2 seconds in a single step by simultaneously focusing initiating and inhibiting excitations within the liquid resin to locally confine the photochemical reaction. The printed films are patterned with an array of holes with a diameter of 30 µm and a pitch of 55 µm. The piezoelectric response is homogeneous across the film, indicating that the print pattern does not impact the PVDF‐TrFE microstructure. Although the printed films contain only a small volume fraction of PVDF‐TrFE (3 wt.%), their piezoelectric response (d33 = 20.3 pC/N) is comparable to the highest literature values reported for PVDF‐TrFE films. The printed PVDF‐TrFE films are predominantly β‐phase, and no electrical poling, post‐processing, piezoelectric or inorganic additives are used in the fabrication. Analysis using piezoresponse force microscopy (PFM) and scanning electron microscopy (SEM) reveals that the enhanced piezoelectric response is due to the preferential formation of oriented PVDF‐TrFE phases during printing. These results demonstrate how the dedicated design of photoactive resins in combination with volumetric additive manufacturing can be applied to rapidly fabricate functional 3D structures.

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Preparation of PVDF flexible piezoelectric film with high β-phase content by matching solvent dipole moment and crystallization temperature

Cited by 32 publications

References 37 publications

Optimization of Anisotropic Crystalline Structure of Molecular Necklace-like Polyrotaxane for Tough Piezoelectric Elastomer

Optimization of Anisotropic Crystalline Structure of Molecular Necklace-like Polyrotaxane for Tough Piezoelectric Elastomer

Gravure Printing for PVDF Thin-Film Pyroelectric Device Manufacture

Volumetric 3D‐Printed Piezoelectric Polymer Films

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