Development of In-Situ Poled Nanofiber Based Flexible Piezoelectric Nanogenerators for Self-Powered Motion Monitoring

Energy harvesting technologies have found significant importance over the past decades due to the increasing demand of energy and self-powered design of electronic and implantable devices. Herein, we demonstrate the design and application of in situ poled highly flexible piezoelectric poly vinylidene fluoride (PVDF) graphene oxide (GO) hybrid nanofibers in aligned mode for multifaceted applications from locomotion sensors to self-powered motion monitoring. Here we exploited the simplest and most versatile method, called electrospinning, to fabricate the in situ poled nanofibers by transforming non-polar α-phase of PVDF to polar β- phase structures for enhanced piezoelectricity under high bias voltage. The flexible piezoelectric device fabricated using the aligned mode generates an improved output voltage of 2.1 V at a uniform force of 12 N. The effective piezoelectric transduction exhibited by the proposed system was tested for its multiple efficacies as a locomotion detector, bio-e-skin, smart chairs and so on.

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Effect of in situ synthesized Fe2O3and Co3O4nanoparticles on electroactive β phase crystallization and dielectric properties of poly(vinylidene fluoride) thin films

Physical Chemistry Chemical Physics ◽

10.1039/c4cp04006f ◽

2015 ◽

Vol 17 (2) ◽

pp. 1368-1378 ◽

Cited By ~ 70

Author(s):

Pradip Thakur ◽

Arpan Kool ◽

Biswajoy Bagchi ◽

Sukhen Das ◽

Papiya Nandy

Keyword(s):

Thin Films ◽

Dielectric Properties ◽

Vinylidene Fluoride ◽

Dielectric Constants ◽

Β Phase ◽

Poly Vinylidene Fluoride

In situsynthesis of Fe2O3–Co3O4nanoparticles stabilized electroactive PVDF thin films with colossal dielectric constants.

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Characterization and Application of PVDF and Its Copolymer Films Prepared by Spin-Coating and Langmuir–Blodgett Method

Polymers ◽

10.3390/polym11122033 ◽

2019 ◽

Vol 11 (12) ◽

pp. 2033 ◽

Cited By ~ 9

Author(s):

Zerun Yin ◽

Bobo Tian ◽

Qiuxiang Zhu ◽

Chungang Duan

Keyword(s):

Spin Coating ◽

Vinylidene Fluoride ◽

Medical Applications ◽

Ongoing Research ◽

Langmuir Blodgett ◽

Copolymer Films ◽

The Past ◽

Β Phase ◽

Poly Vinylidene Fluoride ◽

Ε Phase

Poly(vinylidene fluoride) (PVDF) and its copolymers are key polymers, displaying properties such as flexibility and electroactive responses, including piezoelectricity, pyroelectricity, and ferroelectricity. In the past several years, they have been applied in numerous applications, such as memory, transducers, actuators, and energy harvesting and have shown thriving prospects in the ongoing research and commercialization process. The crystalline polymorphs of PVDF can present nonpolar α, ε phase and polar β, γ, and δ phases with different processing methods. The copolymers, such as poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)), can crystallize directly into a phase analogous to the β phase of PVDF. Since the β phase shows the highest dipole moment among polar phases, many reproducible and efficient methods producing β-phase PVDF and its copolymer have been proposed. In this review, PVDF and its copolymer films prepared by spin-coating and Langmuir–Blodgett (LB) method are introduced, and relevant characterization techniques are highlighted. Finally, the development of memory, artificial synapses, and medical applications based on PVDF and its copolymers is elaborated.

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High dielectric poly(vinylidene fluoride) nanocomposite films with MoS2 using polyaniline interlinker via interfacial interaction

Journal of Materials Chemistry C ◽

10.1039/c7tc03593d ◽

2017 ◽

Vol 5 (46) ◽

pp. 12121-12133 ◽

Cited By ~ 28

Author(s):

Nirmal Maity ◽

Amit Mandal ◽

Arun K. Nandi

Keyword(s):

Dielectric Constant ◽

Molybdenum Disulfide ◽

Vinylidene Fluoride ◽

Interfacial Interaction ◽

Nanocomposite Films ◽

Good Dispersion ◽

Β Phase ◽

Poly Vinylidene Fluoride ◽

High Dielectric

Aniline in situ polymerized within exfoliated molybdenum disulfide produces MoS2–PANI with raspberry morphology, showing good dispersion into poly(vinylidene fluoride)(PVDF) and produces 86% β-phase PVDF yielding dielectric constant 586 at 102 Hz.

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High Efficient and Continuous Triboelectric Power Harvesting based on Porous β-phase Poly (vinylidene fluoride) Aerogel

New Journal of Chemistry ◽

10.1039/d0nj05134a ◽

2021 ◽

Author(s):

Minmin Wang ◽

Weiqun Liu ◽

Xu Shi ◽

Jinyang Pan ◽

Bing Zhou ◽

...

Keyword(s):

Vinylidene Fluoride ◽

High Electron ◽

Exchange Method ◽

Power Harvesting ◽

Β Phase ◽

Output Performance ◽

High Electron Affinity ◽

High Efficient ◽

Poly Vinylidene Fluoride ◽

High Output

Non-additive β-phase porous poly (vinylidene fluoride) (PVDF) aerogel with high electron affinity is successfully prepared through simple solvent exchange method. The as-prepared additive-free PVDF aerogel shows high output performance used...

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Comparative Study of PVDF Sheets and Their Sensitivity to Mechanical Vibrations: The Role of Dimensions, Molecular Weight, Stretching and Poling

Nanomaterials ◽

10.3390/nano11071637 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1637

Author(s):

Miroslav Mrlík ◽

Josef Osička ◽

Martin Cvek ◽

Markéta Ilčíková ◽

Peter Srnec ◽

...

Keyword(s):

Molecular Weight ◽

Comparative Study ◽

Vinylidene Fluoride ◽

Initial Thickness ◽

Complementary Method ◽

Β Phase ◽

Vibration Sensing ◽

Poly Vinylidene Fluoride ◽

Processing Techniques ◽

The Comparative Study

This paper is focused on the comparative study of the vibration sensing capabilities of poly(vinylidene fluoride) (PVDF) sheets. The main parameters such as molecular weight, initial sample thickness, stretching and poling were systematically applied, and their impact on sensing behavior was examined. The mechanical properties of prepared sheets were investigated via tensile testing on the samples with various initial thicknesses. The transformation of the α-phase to the electro-active β-phase was analyzed using FTIR after applying stretching and poling procedures as crucial post-processing techniques. As a complementary method, the XRD was applied, and it confirmed the crystallinity data resulting from the FTIR analysis. The highest degree of phase transformation was found in the PVDF sheet with a moderate molecular weight (Mw of 275 kDa) after being subjected to the highest axial elongation (500%); in this case, the β-phase content reached approximately 90%. Finally, the vibration sensing capability was systematically determined, and all the mentioned processing/molecular parameters were taken into consideration. The whole range of the elongations (from 50 to 500%) applied on the PVDF sheets with an Mw of 180 and 275 kDa and an initial thickness of 0.5 mm appeared to be sufficient for vibration sensing purposes, showing a d33 piezoelectric charge coefficient from 7 pC N−1 to 9.9 pC N−1. In terms of the d33, the PVDF sheets were suitable regardless of their Mw only after applying the elongation of 500%. Among all the investigated samples, those with an initial thickness of 1.0 mm did not seem to be suitable for vibration sensing purposes.

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Studies on the electrostatic effects of stretched PVDF films and nanofibers

Nanoscale Research Letters ◽

10.1186/s11671-021-03536-9 ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Yixuan Lin ◽

Yuqiong Zhang ◽

Fan Zhang ◽

Meining Zhang ◽

Dalong Li ◽

...

Keyword(s):

Vinylidene Fluoride ◽

Polarized Light ◽

Transition Process ◽

Open Circuit ◽

Wearable Electronics ◽

Energy Harvesters ◽

Β Phase ◽

Poly Vinylidene Fluoride ◽

Piezoelectric Effects ◽

Energy Harvesting Devices

AbstractThe electroactive β-phase in Poly (vinylidene fluoride, PVDF) is the most desirable conformation due to its highest pyro- and piezoelectric properties, which make it feasible to be used as flexible sensors, wearable electronics, and energy harvesters etc. In this study, we successfully developed a method to obtain high-content β-phase PVDF films and nanofiber meshes by mechanical stretching and electric spinning. The phase transition process and pyro- and piezoelectric effects of stretched films and nanofiber meshes were characterized by monitoring the polarized light microscopy (PLM) images, outputting currents and open-circuit voltages respectively, which were proved to be closely related to stretching ratio (λ) and concentrations. This study could expand a new route for the easy fabrication and wide application of PVDF films or fibers in wearable electronics, sensors, and energy harvesting devices.

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All-Fiber Pyro- and Piezo-electric Nanogenerator for IoT Based Self-Powered Health-Care Monitoring

Materials Advances ◽

10.1039/d1ma00131k ◽

2021 ◽

Author(s):

Biswajit Mahanty ◽

Sujoy Kumar Ghosh ◽

Kuntal Maity ◽

KRITTISH ROY ◽

Subrata Sarkar ◽

...

Keyword(s):

Health Care ◽

Carbon Nanotube ◽

Vinylidene Fluoride ◽

Electrospun Nanofibers ◽

Multiwall Carbon Nanotube ◽

Poly Vinylidene Fluoride ◽

Self Powered ◽

Health Care Monitoring ◽

Multiwall Carbon ◽

Piezo Electric

In this work, an all-fiber pyro- and piezo-electric nanogenerator (PPNG) is designed by multiwall carbon nanotube (MWCNT) doped poly(vinylidene fluoride) (PVDF) electrospun nanofibers as the active layer and interlocked conducting...

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