Flexible piezoelectric energy harvesters using different architectures of ferrite based nanocomposites

Chinya, Ipsita; Sasmal, Abhishek; Pal, Avijit; Sen, Shrabanee

doi:10.1039/c9ce00406h

Cited by 22 publications

(12 citation statements)

References 56 publications

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“…Poly(vinylidene fluoride) (PVDF)‐based fluoropolymers have received significant attention for electric energy storage applications due to their relatively high dielectric constant (10–12) except their excellent ferro‐ and piezo‐electric properties . However, the discharged energy density ( U e ) in these normal ferroelectric polymers (such as a copolymer with trifluoroethylene [TrFE]) is rather low because of the large remnant polarization ( P r ) induced by ferroelectric relaxation.…”

Section: Figurementioning

confidence: 99%

“…This work may provide an effective strategy to introduce functional groups into P(VDF-TrFE) copolymer via activation of CF bonds.Poly(vinylidene fluoride) (PVDF)-based fluoropolymers have received significant attention for electric energy storage applications due to their relatively high dielectric constant (10-12) except their excellent ferro-and piezo-electric properties. [1][2][3][4][5] However, the discharged energy density (U e ) in these normal ferroelectric polymers (such as a copolymer with trifluoroethylene [TrFE]) is rather low because of the large remnant polarization (P r ) induced by ferroelectric relaxation. Incorporating the third bulky monomer including chlorotrifluoroethylene (CTFE), chlorofluoroethylene (CFE), or hexafluoropropylene (HFP) into P(VDF-TrFE) can convert it from a normal ferroelectric into a relaxor ferroelectric characterized with a narrowed displacement-electric field (D-E) loops and dramatically reduced P r .…”

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confidence: 99%

“…a) ln([M] 0 /[M] t ) and monomer conversion as a function of reaction time, b) MMA grafted (mol%) and TrFE initiated (mol%) as a function of reaction time.propagating species [RM-F] = [R-F] 0 -[R-F] t is not a constant, but a function of reaction time t, which can be obtained from Equation(4). Therefore, by integrating the reaction time from 0 to t of Equation(5), [M] as a function of time t can be observed as K 1 is equal to k p K ATRP1 [Cu I /L]/[Cu II /L].…”

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confidence: 99%

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Grafting PMMA onto P(VDF‐TrFE) by CF Activation via a Cu(0) Mediated Controlled Radical Polymerization Process

Liao

Peng

Tan

et al. 2020

Macromol. Rapid Commun.

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In the present work, poly(methyl methacrylate) (PMMA) is successfully grafted onto poly(vinylidene fluoride‐trifluoroethylene) (P(VDF‐TrFE)) side chains via directly activated CF bonds using Cu(0)/2,2′‐bipyridine as catalyst. The reaction mechanism and the initiating sites can be confirmed by the structure of the graft copolymer. The graft copolymerization exhibits first‐order kinetics, and reaction conditions can affect the chemical composition of the graft copolymer, including reaction time, reaction temperature, solvents, the amount of catalyst, and monomer. The introduction of rigid PMMA side chains onto P(VDF‐TrFE) can effectively tune the displacement–electric field hysteresis behaviors of P(VDF‐TrFE) from normal ferroelectric to anti‐ferroelectric, even linear‐like dielectric, under high electric field, resulting in dramatically reduced energy loss while maintaining the discharged energy density. This work may provide an effective strategy to introduce functional groups into P(VDF‐TrFE) copolymer via activation of CF bonds.

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Section: Figurementioning

confidence: 99%

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confidence: 99%

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Grafting PMMA onto P(VDF‐TrFE) by CF Activation via a Cu(0) Mediated Controlled Radical Polymerization Process

Liao

Peng

Tan

et al. 2020

Macromol. Rapid Commun.

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“…We are definitely entering the age of smart cities and big data. From this perspective, piezoelectric materials have gained prominence due to their high employability not only in the field of sensors and transducers, but also in the area of energy harvesting 1–14 . Features such as multifunctionality, flexibility, durability, and reproducibility, are essential for the use of these materials in applications such as sensory skins for robotics, artificial muscles, self‐powered sensors, and wearable electronic devices, and so on 13 .…”

Section: Introductionmentioning

confidence: 99%

Tuning piezoelectric properties in elastomeric polyurethane nanocomposites utilizing cellulose nanocrystals

Sanches

Silva

Malmonge

et al. 2021

J of Applied Polymer Sci

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Flexible piezoelectric nanocomposites have been the subject of a lot of recent research due to the development and use of wearable electronic devices and the increasing need for new harvesting devices and sensors due to increasingly intelligent and interconnected cities. In this study, flexible piezoelectric nanocomposites using elastomeric polyurethane (PU) as matrix, and lead zirconate titanate (PZT) as active phase, were produced using cellulose nanocrystals (CNC) as the third phase. The study describes the effect of CNC insertion on the morphology, thermal, electrical, and piezoelectric properties of the nanocomposites. It points out that the CNCs not only act to cause greater dispersion of the ceramic grains in the matrix, but also to lead to greater polarization effectiveness of the ceramic grains, resulting in a longitudinal piezoelectric coefficient (d33) increase of more than 370%, as compared with biphasic composites dependent on the ceramic and nanocrystals content.

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“…During the last few years, there has been an increasing interest in the development of piezoelectric composite materials for energy harvesting, actuators, and soft sensors applications. The coupling of piezo-ceramic fillers with polymeric matrices, such as polydimethylsiloxane (PDMS) and polyvinylidenefluoride (PVDF), can combine high dielectric and piezoelectric properties of ceramics with flexibility and softness of polymers [ 1 , 2 , 3 ]. To get high performance piezo-composites, the production and development of piezoceramics plays a key role.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrothermal Treatment and Doping on the Microstructural Features of Sol-Gel Derived BaTiO3 Nanoparticles

et al. 2021

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Barium Titanate (BaTiO3) is one of the most promising lead-free ferroelectric materials for the development of piezoelectric nanocomposites for nanogenerators and sensors. The miniaturization of electronic devices is pushing researchers to produce nanometric-sized particles to be embedded into flexible polymeric matrices. Here, we present the sol-gel preparation of crystalline BaTiO3 nanoparticles (NPs) obtained by reacting barium acetate (Ba(CH3COO)2) and titanium (IV) isopropoxide (Ti(OiPr)4). The reaction was performed both at ambient conditions and by a hydrothermal process carried on at 200 °C for times ranging from 2 to 8 h. Doped BaTiO3 nanoparticles were also produced by addition of Na, Ca, and Bi cations. The powders were annealed at 900 °C in order to improve NPs crystallinity and promote the cubic-to-tetragonal (c⟶t) phase transformation. The microstructural features of nanoparticles were investigated in dependence of both the hydrothermal reaction time and the presence of dopants. It is found that short hydrothermal treatment (2 h) can produce BaTiO3 spherical and more homogeneous nanoparticles with respect to longer hydrothermal treatments (4 h, 6 h, 8 h). These particles (2 h) are characterized by decreased dimension (approx. 120 nm), narrower size distribution and higher tetragonality (1.007) in comparison with particles prepared at ambient pressure (1.003). In addition, the short hydrothermal treatment (2 h) produces particles with tetragonality comparable to the one obtained after the longest process (8 h). Finally, dopants were found to affect to different extents both the c⟶t phase transformation and the crystallite sizes.

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Flexible piezoelectric energy harvesters using different architectures of ferrite based nanocomposites

Abstract: Electroactive phase transition in polyvinylidene fluoride (PVDF) can be economically achieved readily by addition of nanofillers.

Cited by 22 publications

References 56 publications

Grafting PMMA onto P(VDF‐TrFE) by CF Activation via a Cu(0) Mediated Controlled Radical Polymerization Process

Grafting PMMA onto P(VDF‐TrFE) by CF Activation via a Cu(0) Mediated Controlled Radical Polymerization Process

Tuning piezoelectric properties in elastomeric polyurethane nanocomposites utilizing cellulose nanocrystals

Effect of Hydrothermal Treatment and Doping on the Microstructural Features of Sol-Gel Derived BaTiO3 Nanoparticles

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