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Exceptionally High Negative Electro-Caloric Effects of Poly(VDF⁻co⁻TrFE) Based Nanocomposites Tuned by the Geometries of Barium Titanate Nanofillers.

ABSTRACT: Exceptionally high electro-caloric effects (ECEs) are observed in nanocomposites consisting of poly(vinylidene fluoride-co-trifluoroethylene) (VDF⁻co⁻TrFE) copolymer and barium titanate (BT) nanoparticles and nanowires. The poly(VDF⁻co⁻TrFE) matrix nanocomposites containing 5% volume fraction of BT nanowires are found to exhibit a negative ECE temperature change as large as 12 °C or a refrigeration effect of 8.3 J/g, which is much larger than those reported to date. The mechanisms of negative ECE and the enhanced negative ECE in the nanocomposites consisting of poly(VDF⁻co⁻TrFE) and BT nanowires are explained by the Kauzmann theory on glassy polar states and the interaction between BT nanofillers and the copolymer matrix. The effects of geometries of BT nanofillers on the negative ECEs are elucidated by P-E loop measurements, and dielectric and dynamical mechanical analyses. The nanocomposites, with their enhanced negative ECE tuned by the geometries of BT nanofillers, provide us with promising ECE refrigerants for practical application to small-sized and environmentally-friendly ECE coolers in the heat management of electronic devices.

SUBMITTER: Jiang ZY

PROVIDER: S-EPMC6418831 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature

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Exceptionally High Negative Electro-Caloric Effects of Poly(VDF⁻co⁻TrFE) Based Nanocomposites Tuned by the Geometries of Barium Titanate Nanofillers.

Jiang Zhi-Yuan ZY Zheng Guang-Ping GP Zheng Xiu-Cheng XC Wang Hao H

Polymers 20170728 8

Exceptionally high electro-caloric effects (ECEs) are observed in nanocomposites consisting of poly(vinylidene fluoride-co-trifluoroethylene) (VDF⁻co⁻TrFE) copolymer and barium titanate (BT) nanoparticles and nanowires. The poly(VDF⁻co⁻TrFE) matrix nanocomposites containing 5% volume fraction of BT nanowires are found to exhibit a negative ECE temperature change as large as 12 °C or a refrigeration effect of 8.3 J/g, which is much larger than those reported to date. The mech ...[more]

PMID: 30970990

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Project description:Flexible polymer-based piezoelectric nanogenerators (PENGs) have gained significant interest due to their ability to deliver clean and sustainable energy for self-powered electronics and wearable devices. Recently, the incorporation of fillers into the ferroelectric polymer matrix has been used to improve the relatively low piezoelectric properties of polymer-based PENGs. In this study, we investigated the effect of various nanofillers such as titania (TiO2), zinc oxide (ZnO), reduced graphene oxide (rGO), and lead zirconate titanate (PZT) on the PENG performance of the nanocomposite thin films containing the nanofillers in poly(vinylidene fluoride-co-trifluoro ethylene) (P(VDF-TrFE)) matrix. The nanocomposite films were prepared by depositing molecularly thin films of P(VDF-TrFE) and nanofiller nanoparticles (NPs) spread at the air/water interface onto the indium tin oxide-coated polyethylene terephthalate (ITO-PET) substrate, and they were characterized by measuring their microstructures, crystallinity, β-phase contents, and piezoelectric coefficients (d33) using SEM, FT-IR, XRD, and quasi-static meter, respectively. Multiple PENGs incorporating various nanofillers within the polymer matrix were developed by assembling thin film-coated substrates into a sandwich-like structure. Their piezoelectric properties, such as open-circuit output voltage (VOC) and short-circuit current (ISC), were analyzed. As a result, the PENG containing 4 wt% PZT, which was named P-PZT-4, showed the best performance of VOC of 68.5 V with the d33 value of 78.2 pC/N and β-phase content of 97%. The order of the maximum VOC values for the PENGs of nanocomposite thin films containing various nanofillers was PZT (68.5 V) > rGO (64.0 V) > ZnO (50.9 V) > TiO2 (48.1 V). When the best optimum PENG was integrated into a simple circuit comprising rectifiers and a capacitor, it demonstrated an excellent two-dimensional power density of 20.6 μW/cm2 and an energy storage capacity of 531.4 μJ within 3 min. This piezoelectric performance of PENG with the optimized nanofiller type and content was found to be superior when it was compared with those in the literature. This PENG comprising nanocomposite thin film with optimized nanofiller type and content shows a potential application for a power source for low-powered electronics such as wearable devices.

Dataset Information

Exceptionally High Negative Electro-Caloric Effects of Poly(VDF⁻co⁻TrFE) Based Nanocomposites Tuned by the Geometries of Barium Titanate Nanofillers.

Publications

Exceptionally High Negative Electro-Caloric Effects of Poly(VDF⁻co⁻TrFE) Based Nanocomposites Tuned by the Geometries of Barium Titanate Nanofillers.

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