Properties and Applications of Flexible Poly(Vinylidene Fluoride)-Based Piezoelectric Materials

Poly (vinylidene fluoride) (PVDF) is a kind of semicrystalline organic polymer piezoelectric material. Adopting processes such as melting crystallization and solution casting, and undergoing post-treatment processes such as annealing, stretching, and polarization, PVDF films with high crystallinity and high piezoelectric response level can be realized. As a polymer material, PVDF shows excellent mechanical properties, chemical stability and biocompatibility, and is light in weight, easily prepared, which can be designed into miniaturized, chip-shaped and integrated devices. It has a wide range of applications in self-powered equipment such as sensors, nanogenerators and currently is a research hotspot for use as flexible wearable or implantable materials. This article mainly introduces the crystal structures, piezoelectric properties and their applications in flexible piezoelectric devices of PVDF materials.

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A self-powered vibration sensor based on electrospun poly(vinylidene fluoride) nanofibres with enhanced piezoelectric response

Smart Materials and Structures ◽

10.1088/0964-1726/25/10/105010 ◽

2016 ◽

Vol 25 (10) ◽

pp. 105010 ◽

Cited By ~ 15

Author(s):

Xumin Pan ◽

Zhao Wang ◽

Zilan Cao ◽

Shenqiu Zhang ◽

Yahua He ◽

...

Keyword(s):

Vinylidene Fluoride ◽

Vibration Sensor ◽

Piezoelectric Response ◽

Poly Vinylidene Fluoride ◽

Self Powered

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Origin of giant negative piezoelectricity in a layered van der Waals ferroelectric

Science Advances ◽

10.1126/sciadv.aav3780 ◽

2019 ◽

Vol 5 (4) ◽

pp. eaav3780 ◽

Cited By ~ 39

Author(s):

Lu You ◽

Yang Zhang ◽

Shuang Zhou ◽

Apoorva Chaturvedi ◽

Samuel A. Morris ◽

...

Keyword(s):

Density Functional ◽

Vinylidene Fluoride ◽

Piezoelectric Materials ◽

Van Der Waals ◽

Density Functional Theory Calculations ◽

Piezoelectric Response ◽

X Ray Crystallography ◽

Poly Vinylidene Fluoride ◽

Piezoelectricity And Electrostriction ◽

Almost All

Recent research on piezoelectric materials is predominantly devoted to enhancing the piezoelectric coefficient, but overlooks its sign, largely because almost all of them exhibit positive longitudinal piezoelectricity. The only experimentally known exception is ferroelectric polymer poly(vinylidene fluoride) and its copolymers, which condense via weak van der Waals (vdW) interaction and show negative piezoelectricity. Here we report quantitative determination of giant intrinsic negative longitudinal piezoelectricity and electrostriction in another class of vdW solids—two-dimensional (2D) layered ferroelectric CuInP2S6. With the help of single crystal x-ray crystallography and density-functional theory calculations, we unravel the atomistic origin of negative piezoelectricity in this system, which arises from the large displacive instability of Cu ions coupled with its reduced lattice dimensionality. Furthermore, the sizable piezoelectric response and negligible substrate clamping effect of the 2D vdW piezoelectric materials warrant their great potential in nanoscale, flexible electromechanical 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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Effect of Interface and Crystallinity on the Ferroelectric Properties of Poly(Vinylidene Fluoride-Trifluoroethylene) Copolymer Thin Films

MRS Proceedings ◽

10.1557/proc-665-c10.10 ◽

2001 ◽

Vol 665 ◽

Author(s):

Feng Xia ◽

H.S. Xu ◽

Babak Razavi ◽

Q. M. Zhang

Keyword(s):

Thin Films ◽

Vinylidene Fluoride ◽

Ferroelectric Properties ◽

Large Change ◽

Thickness Dependence ◽

Dielectric Measurement ◽

Switching Speed ◽

Wide Range ◽

Poly Vinylidene Fluoride ◽

Polarization Level

ABSTRACTFerroelectric polymer thin films are attractive for a wide range of applications such as MEMS, IR sensors, and memory devices. We present the results of a recent investigation on the thickness dependence of the ferroelectric properties of poly(vinylidene fluoridetrifluoroethylene) copolymer spin cast films on electroded Si substrate. We show that as the film thickness is reduced, there exist two thickness regions. For films at thickness above 100 nm, the thickness dependence of the ferroelectric properties can be attributed to the interface effect. However, for thinner films, there is a large change in the ferroelectric properties such as the polarization level, the coercive field, and polarization switching speed, which is related to the large drop of the crystallinity in the ultrathin film region (below 100 nm). The results from Xray, dielectric measurement, and AFM all indicate that there is a threshold thickness at about 100 nm below which the crystallinity in the film reduces abruptly.

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A Method for Quantitatively Separating the Piezoelectric Component from the as-received "Piezoelectric" Signal

10.21203/rs.3.rs-857809/v1 ◽

2021 ◽

Author(s):

Chaojie Chen ◽

Shilong Zhao ◽

Caofeng Pan ◽

Yunlong Zi ◽

Fangcheng Wang ◽

...

Keyword(s):

Vinylidene Fluoride ◽

Piezoelectric Effect ◽

Piezoelectric Materials ◽

Contact Electrification ◽

Poly Vinylidene Fluoride ◽

Implantable Electronics ◽

The Time Domain ◽

Electric Signals ◽

Piezoelectric Devices ◽

Piezoelectric Performance

Abstract Polymer-based piezoelectric devices are promising for developing future wearable force sensors, nanogenerators, and implantable electronics etc. The electric signals generated by them are often assumed as solely coming from piezoelectric effect. However, triboelectric signals originated from contact electrification between the piezoelectric devices and the contacted objects can produce non-negligible interfacial electron transfer, which is often combined with the piezoelectric signal to give a triboelectric-piezoelectric hybrid output, leading to an exaggerated measured “piezoelectric” signal. Herein, a simple and effective method is proposed for quantitatively identifying and extracting the piezoelectric charge from the hybrid signal. The triboelectric and piezoelectric parts in the hybrid signal generated by a poly(vinylidene fluoride)-based device are clearly differentiated, and their force and charge characteristics in the time domain are identified. This work presents an effective method to elucidate the true piezoelectric performance in practical measurement, which is crucial for evaluating piezoelectric materials fairly and correctly.

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

Applied Sciences ◽

10.3390/app10103493 ◽

2020 ◽

Vol 10 (10) ◽

pp. 3493

Author(s):

Minjung Kim ◽

Vignesh Krishnamoorthi Kaliannagounder ◽

Afeesh Rajan Unnithan ◽

Chan Hee Park ◽

Cheol Sang Kim ◽

...

Keyword(s):

Vinylidene Fluoride ◽

Implantable Devices ◽

The Past ◽

Β Phase ◽

Poly Vinylidene Fluoride ◽

High Bias ◽

Self Powered ◽

Increasing Demand ◽

Piezoelectric Nanogenerators

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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Degradation of the dielectric and piezoelectric response of β-poly(vinylidene fluoride) after temperature annealing

Journal of Polymer Research ◽

10.1007/s10965-010-9550-x ◽

2011 ◽

Vol 18 (6) ◽

pp. 1451-1457 ◽

Cited By ~ 50

Author(s):

M. P. Silva ◽

C. M. Costa ◽

V. Sencadas ◽

A. J. Paleo ◽

S. Lanceros-Méndez

Keyword(s):

Vinylidene Fluoride ◽

Piezoelectric Response ◽

Poly Vinylidene Fluoride

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Relationship between the microstructure and the microscopic piezoelectric response of the α- and β-phases of poly(vinylidene fluoride)

Applied Physics A ◽

10.1007/s00339-009-5089-2 ◽

2009 ◽

Vol 95 (3) ◽

pp. 875-880 ◽

Cited By ~ 36

Author(s):

J. Serrado Nunes ◽

A. Wu ◽

J. Gomes ◽

V. Sencadas ◽

P. M. Vilarinho ◽

...

Keyword(s):

Vinylidene Fluoride ◽

Piezoelectric Response ◽

Poly Vinylidene Fluoride

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Enhancement of Piezoelectric Coefficient (d33) in PVDF-TrFe/CoFe2O4 nanocomposites through DC magnetic poling

10.3762/bxiv.2021.55.v1 ◽

2021 ◽

Author(s):

Marco Fortunato ◽

Alessio Tamburrano ◽

Maria Paola Bracciale ◽

Maria Laura Santarelli ◽

Maria Sabrina Sarto

Keyword(s):

Magnetic Fields ◽

Electric Fields ◽

Piezoelectric Coefficient ◽

Vinylidene Fluoride ◽

Piezoelectric Materials ◽

Low Cost ◽

Sample Surface ◽

Special Focus ◽

Phase Alignment ◽

Poly Vinylidene Fluoride

In the last years flexible, low-cost, wearable and innovative piezoelectric nanomaterials, have attracted a considerable interest to develop energy harvesters and sensors. Among the piezoelectric materials, a special focus was paid on electroactive polymers such as Poly(vinylidene fluoride) [PVDF] and on its copolymer Poly(vinylidene fluoride-co-trifluoroethylene) [PVDF-TrFe], which is one of the most investigated piezoelectric polymers, due to the high β-phase content resulting under specific curing or processing conditions. However, to get high piezoelectric coefficient (d33), alignment of the β-phase domains is needed, which is usually obtained by applying a high electric fields at moderate temperatures. This process, usually referred as electrical poling, requires the deposition of contact electrodes over the sample surface, and the use of high voltage apparatus. In the present work, in order to overcome these constraints we have produced, characterized and studied a polymer nanocomposite, consisting of CoFe2O4 nanoparticles dispersed in PVDF-TrFe with enhancement of the β-phase alignment through and applied a DC magnetic fields. The magnetic poling was demonstrated to be particular effective, leading to a piezoelectric coefficient, d33, with values up to 39 pm/V. The magnetic poling does not need the use a top electrode and of high magnetic fields (the maximum value of d33 was obtained at 50 mT, using a current of 0.4 A) making the PVDF-TrFE/CoFe2O4 nanocomposite suitable for the fabrication of highly efficient devices for energy harvesting and wearable sensors.

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