Flexible lead-free NBT-BT/PVDF composite films by hot pressing for low-energy harvesting and storage

Petrović, Miloš; Cordero, F.; Mercadelli, Elisa; Brunengo, Elisabetta; Ilić, Nikola; Galassi, Carmen; Despotović, Željko V.; Bobić, J.D.; Dzunuzovic, A.; Stagnaro, Paola; Canu, Giovanna; Craciun, F.

doi:10.1016/j.jallcom.2021.161071

Cited by 32 publications

(43 citation statements)

References 73 publications

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“…Thus, the results proved that CNFs were uniformly distributed in BaTiO 3 and was completely incorporated in BaTiO 3 . 45,46 According to the calculated data in Table S2,† the c/a ratio of all the samples was greater than 1. When the CNFs were prepared with 10 mmol g −1 NaClO, the c/a ratio of the synthesized BaTiO 3 grain was the lowest with a higher crystallinity of 87%.…”

Section: Resultsmentioning

confidence: 95%

Flexible cellulose-based piezoelectric composite membrane involving PVDF and BaTiO₃ synthesized with the assistance of TEMPO-oxidized cellulose nanofibrils

Jiang

Cao

et al. 2023

RSC Adv.

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Section: Resultsmentioning

confidence: 95%

Flexible cellulose-based piezoelectric composite membrane involving PVDF and BaTiO₃ synthesized with the assistance of TEMPO-oxidized cellulose nanofibrils

Jiang

Cao

et al. 2023

RSC Adv.

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“…The lead zirconate titanate (PZT) exhibits low g 33 ∼ 26 mV mN –1 despite having a high value of d 33 ∼ 600 pCN –1 . This issue can be resolved up to an extent by preparing the polymer–ceramic composites due to the high d 33 of ceramics and a very low ε r value of polymers. , However, the low melting point (∼160 °C) and poling difficulties of polymers limit their practical applicability. The orientation of grains in a specific direction (texturing) is another effective technique to improve the dielectric and piezoelectric properties. , The textured ceramics modify these properties by invoking the associated anisotropy similar to that of single crystals.…”

Section: Introductionmentioning

confidence: 99%

“…This issue can be resolved up to an extent by preparing the polymer−ceramic composites due to the high d 33 of ceramics and a very low ε r value of polymers. 9,10 However, the low melting point (∼160 °C) and poling difficulties of polymers limit their practical applicability. The orientation of grains in a specific direction (texturing) is another effective technique to improve the dielectric and piezoelectric properties.…”

Section: Introductionmentioning

confidence: 99%

High-Performance [00l]-Textured BiAlO₃-Doped K_0.5Bi_0.5TiO₃ Ceramics

Badole,

Vasavan,

Saxena

et al. 2023

ACS Appl. Electron. Mater.

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grain-oriented 0.95K 0.5 Bi 0.5 TiO 3 −0.05BiAlO 3 (named K5BA-T) ceramics were prepared via the reactive template grain growth (RTGG) and tape casting technique. High-aspect-ratio K5BA powder was prepared using a plate-shape 4layer aurivillius oxide (K 0.5 Bi 4.5 Ti 4 O 15 ) powder as the template. The effects of grain morphology modification and texturing on the structural, dielectric, and piezoelectric properties of K5BA-T were systematically investigated. The average plate size of ∼6.5 μm with a thickness of ∼400 nm was observed in the K5BA sample. X-ray diffraction (XRD) and bulk texture measurements confirmed the texturing of K5BA-T in the [00l] crystallographic direction with a calculated Lotgering factor of ∼80%. Two anomalies in the temperature-dependent dielectric plot of the poled K5BA-T sample signified additional poling-induced phase transition. A lower value of room-temperature (RT) dielectric constant (ε r ) of ∼ 200 (at 1 MHz) and a higher piezoelectric charge coefficient (d 33 ) of ∼145 pCN −1 were obtained in the poled K5BA-T ceramic compared to that of the 0.95K 0.5 Bi 0.5 TiO 3 −0.05BiAlO 3 ceramic with randomly oriented grains (named K5BA-R). Consequently, the piezoelectric voltage coefficient (g 33 ) estimated for the textured ceramic showed a 650% increment (g 33 ∼ 80 × 10 −3 V mN −1 ) over the K5BA-R sample (g 33 ∼ 12.5 × 10 −3 V mN −1 ). The transduction coefficient (d 33 •g 33 ) of K5BA-T ceramic was calculated to be ∼11 600 × 10 −15 m 2 N −1 , which is nearly 9 times higher compared to its random counterpart. Further, a piezodevice fabricated using poled ceramic for energy harvesting showed an output voltage of ∼7 V with a current response of ∼2 μA under normal finger-tapping motion.

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“…1 PVDF and its copolymers with ceramics are the most extensively utilized ferroelectric polymers due to their welldescribed ferroelectric characteristics and ease of membrane fabrication. [2][3][4][5][6] They have attracted more attention recently, both from a fundamental standpoint and in creating novel technical applications. [7][8][9] PVDF is well known for its polymorphism and can show five types of polymorphs (⊍, ⊎, γ, ⊐ and ε forms) depending on fabrication techniques.…”

Section: Introductionmentioning

confidence: 99%

“…Poly(vinylidene fluoride) (PVDF) is a semi‐crystalline polymer with excellent properties such as excellent thermal stability, desirable flexibility, toughness and piezoelectric properties 1 . PVDF and its copolymers with ceramics are the most extensively utilized ferroelectric polymers due to their well‐described ferroelectric characteristics and ease of membrane fabrication 2–6 . They have attracted more attention recently, both from a fundamental standpoint and in creating novel technical applications 7–9 .…”

Section: Introductionmentioning

confidence: 99%

Local analysis of crystalline phases and properties of poly(vinylidene fluoride) electrospun composites with BaTiO₃ nanorods

Nugraha,

Chou,

Aji

2023

Polymer International

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This study investigated the influence of barium titanate nanorods (BT rods) on the properties and phase formation of polyvinylidene fluoride (PVDF) nanofibers of composite membranes created using the electrospinning technique. The primary objective was to assess the effect of varying BT nanorod concentrations on the membrane properties. The result shows that inserting BT rods into PVDF increases β‐phase content, which, with an optimal concentration of BT rods, affects the activation energy of thermal degradation resulting in the highest β‐phase content and the lowest activation energy at 3% BT content. Moreover, the electrical output of the samples was measured. Using a ball drop test, the sample containing 3 wt% BT rods exhibited the highest output voltage, reaching 1.64 V. The BT nanorods play a significant role in promoting the β‐phase PVDF molecular chain formation, acting as the polar phase in PVDF and aligning with the polarization direction of the BT rods. According to high‐resolution transmission electron microscopy (HRTEM) investigations, crystalline phases on PVDF are strongly correlated with the surface charges of perovskite BT rods. The occurrence of charge on the BT Nanorod significantly contributes to fostering the development of the β‐phase PVDF molecular chain. It essentially performs the function of the polar phase within the PVDF, aligning itself in accordance with the polarization direction inherent to the BT rod. In conclusion, this study demonstrates the potential of incorporating BT rod polar surfaces to interact with the PVDF chains dipole moments, promoting the β‐phase formation.This article is protected by copyright. All rights reserved.

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Flexible lead-free NBT-BT/PVDF composite films by hot pressing for low-energy harvesting and storage

Cited by 32 publications

References 73 publications

Flexible cellulose-based piezoelectric composite membrane involving PVDF and BaTiO₃ synthesized with the assistance of TEMPO-oxidized cellulose nanofibrils

Flexible cellulose-based piezoelectric composite membrane involving PVDF and BaTiO₃ synthesized with the assistance of TEMPO-oxidized cellulose nanofibrils

High-Performance [00l]-Textured BiAlO₃-Doped K_0.5Bi_0.5TiO₃ Ceramics

Local analysis of crystalline phases and properties of poly(vinylidene fluoride) electrospun composites with BaTiO₃ nanorods

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Flexible lead-free NBT-BT/PVDF composite films by hot pressing for low-energy harvesting and storage

Cited by 32 publications

References 73 publications

Flexible cellulose-based piezoelectric composite membrane involving PVDF and BaTiO3 synthesized with the assistance of TEMPO-oxidized cellulose nanofibrils

Flexible cellulose-based piezoelectric composite membrane involving PVDF and BaTiO3 synthesized with the assistance of TEMPO-oxidized cellulose nanofibrils

High-Performance [00l]-Textured BiAlO3-Doped K0.5Bi0.5TiO3 Ceramics

Local analysis of crystalline phases and properties of poly(vinylidene fluoride) electrospun composites with BaTiO3 nanorods

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Flexible cellulose-based piezoelectric composite membrane involving PVDF and BaTiO₃ synthesized with the assistance of TEMPO-oxidized cellulose nanofibrils

Flexible cellulose-based piezoelectric composite membrane involving PVDF and BaTiO₃ synthesized with the assistance of TEMPO-oxidized cellulose nanofibrils

High-Performance [00l]-Textured BiAlO₃-Doped K_0.5Bi_0.5TiO₃ Ceramics

Local analysis of crystalline phases and properties of poly(vinylidene fluoride) electrospun composites with BaTiO₃ nanorods