Article
Chemistry, Physical
Yusra Hambal, Vladimir V. Shvartsman, Ivo Michiels, Qiming Zhang, Doru C. Lupascu
Summary: This article investigates the dielectric properties and energy storage characteristics of composites. The experimental results show that adding BZT nanoparticles to the polymer matrix can significantly increase the dielectric permittivity and improve the discharge energy density.
Article
Materials Science, Multidisciplinary
Thulasinath Raman Venkatesan, David Smykalla, Bernd Ploss, Michael Wubbenhorst, Reimund Gerhard
Summary: Non-linear dielectric spectroscopy was used to study relaxation processes and phase transitions of a poly(vinylidenefluoride-trifluoroethylene-chlorofluoroethylene) relaxor-ferroelectric terpolymer, revealing new peaks at 30 and 80 degrees C. By combining results with other techniques, it was possible to explain the physical processes behind these peaks.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Sara Zanchi, Antoine Pascaud, Fabrice Domingues Dos Santos, Sylvie Tence-Girault, Sebastien Roland
Summary: This article studies the electric responsiveness of P(VDF-co-TrFE) copolymer and P(VDF-ter-TrFE-ter-CTFE) terpolymer films in response to an external electric field. Factors such as chemical composition and thermal treatment affect the performance of these electroactive films. The study analyzes the nanoscale response using piezoresponse force microscopy on thin films (~100 nm thick), and the macroscopic response by measuring the electric displacement-electric field loops on thick films (~20 μm thick). The chemical composition (CTFE content) is crucial in defining the electroactive behavior at both scales, while the thermal treatment has a more significant impact at the nanoscale. The orientation, shape, and size of the crystalline lamellae affect the sensitivity of the electric dipoles to the applied electric field, and controlled growth of edge-on lamellar stacks improves the piezoresponse of the film.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Physical
Ashwath Aravindhan, Pierre Lheritier, Alvar Torello, Uros Prah, Youri Nouchokgwe, Asmaa El Moul, Xavier Chevalier, Fabrice Domingues Dos Santos, Emmanuel Defay, Veronika Kovacova
Summary: In this study, the electrocaloric effect of P(VDF-TrFE-CFE) film was directly analyzed using infrared imaging. The results showed that P(VDF-TrFE-CFE) exhibited a temperature-independent electrocaloric effect at room temperature. A maximum adiabatic temperature change of 3.58 K was measured during the cooling cycle at a field of 100 V/μm at 30°C. Despite the thermal mass of the substrate, a significant electrocaloric effect was observed in P(VDF-TrFE-CFE) films. This terpolymer composition could be of interest for electrocaloric cooling applications.
JOURNAL OF MATERIOMICS
(2023)
Article
Biochemistry & Molecular Biology
Tu-Ngoc Lam, Chia-Yin Ma, Po-Han Hsiao, Wen-Ching Ko, Yi-Jen Huang, Soo-Yeol Lee, Jayant Jain, E-Wen Huang
Summary: The coaxial core/shell composite electrospun nanofibers exhibit superior mechanical and electrical properties compared to individual polymers, with enhanced mechanical anisotropy, good strength-ductility balance, and comparable dielectric responses. Additionally, an impressive piezoelectric coefficient is achieved in the composite structure, showcasing the promising approach of coaxial electrospinning in tuning the performance of electroactive polymers.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Yi-Jen Huang, Po-Han Hsiao, Chun-Chieh Wang, Chun-Jen Su, Jen-Hao Chang, Yu-Cheng Kuo, Wen-Ching Ko
Summary: Soft piezoelectric composite nanofibers composed of P(VDF-TrFE) and P(VDF-TrFE-CTFE) were prepared by coaxial electrospinning technique. The relationship between crystal structures and piezoelectric responses was investigated. The piezoelectric voltages of the composite nanofibers were approximately 3.0 V and 3.5 V at 10 Hz and 100 Hz, respectively. In-situ WAXS was used to observe the effect of applied voltage on lattice strains in different lattice orientations. Crystallographic studies on the composite nanofibers revealed co-crystallization, which led to higher piezoelectric voltages in the composite nanofibers.
Article
Polymer Science
Wenyi Zhu, Xin Chen, Q. M. Zhang
Summary: We studied the effects of annealing temperatures on the ferroelectric and electromechanical responses of a relaxor polymer. The results showed that only within a narrow temperature window, the polymer exhibited the highest electromechanical response. Films annealed outside of this window contained a small amount of polar phase mixed with the relaxor phase, resulting in different responses.
Article
Chemistry, Physical
Xun Jiang, Hang Luo, Fan Wang, Xiaona Li, Haoran Xie, Yuan Liu, Guoqiang Zou, Xiaobo Ji, Hongshuai Hou, Dou Zhang
Summary: This study aims to improve the low breakdown strength and premature saturation of polarization of P(VDF-TrFE-CTFE) polymer by adding carbon quantum dots (CQDs). The nanocomposite with 0.1 wt% CQDs showed significantly improved breakdown strength and discharge energy density. The research demonstrates the effective enhancement of breakdown strength and energy density by ultralow loading of CQDs for P(VDF-TrFE-CTFE) polymer.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Armando Ferreira, Carlos M. Costa, Marcio A. Correa, Rafael S. Pinto, Renato Gonsalves, Luana C. Benetti, Senentxu Lanceros-Mendez, Filipe Vaz
Summary: The necessity for energy conversion solutions has increased in recent years, particularly for powering small and flexible IoT devices. This study explores the use of thermoelectric effects, specifically the anomalous Nernst effect, by producing Co2FeAl/P(VDF-TrFE-CFE) heterostructures on flexible poly (vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) substrates. The results demonstrate that the flexible polymer substrate does not affect the thermomagnetic effect, opening new possibilities for integrating flexible high-dielectric polymers with thermomagnetic phenomena for energy harvesting applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Polymer Science
Yusra Hambal, Vladimir V. Shvartsman, Daniil Lewin, Chieng Huo Huat, Xin Chen, Ivo Michiels, Qiming Zhang, Doru C. Lupascu
Summary: The temperature dependence of dielectric permittivity and polarization hysteresis loops of P(VDF-TrFE-CFE) polymer films with different compositions was studied, confirming relaxor behavior in all samples. Increasing CFE content lowered the freezing temperature and stabilized the ergodic relaxor state, with observed double hysteresis loops related to a field-induced transition to a ferroelectric state. Energy storage performance was evaluated, with one composition showing the largest energy density and charge-discharge efficiency comparable to the best literature data for the neat terpolymers.
Article
Polymer Science
Rong Wang, Weimin Xia, Xiaofang Zhang, Yuanyuan Xi
Summary: A group of ferroelectric polyvinylidene-trifluoroethylene (P(VDF-TrFE)) with different TrFE contents is synthesized. The crystalline region of P(VDF-TrFE) with 80/20 mol% TrFE is predominantly beta crystal phase, resulting in favorable ferroelectric behavior. Blend films of P(VDF-TrFE) and polyvinylidene fluoride (PVDF) exhibit three sequential conversion stages of ferroelectricity, antiferroelectricity, and relaxor ferroelectricity with increasing PVDF content. Stretching the PVDF/P(VDF-TrFE) blend film reforms the ferroelectricity and enhances the polarization properties. Overall, this work provides insights into modifying the ferroelectric performance of hydrogenated P(VDF-TrFE) through changing TrFE content, blending with PVDF, and stretching.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Physical
Pengshan Xie, Yulong Huang, Wei Wang, You Meng, Zhengxun Lai, Fei Wang, SenPo Yip, Xiuming Bu, Weijun Wang, Dengji Li, Jia Sun, Johnny C. Ho
Summary: The research presents InGaAs nanowire artificial synapses wrapped in poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)), capable of operating with record-low subfemtojoule power consumption. By adjusting the thickness of top P(VDF-TrFE) films, essential synaptic behaviors are effectively mimicked and modulated, while long-term depression is realized through visible light application. Combined with optimal P(VDF-TrFE) films, the synaptic devices exhibit more linear characteristics and faster learning processes, demonstrating potential advantages for neuromorphic computing systems.
Article
Materials Science, Multidisciplinary
Xun Jiang, Ru Guo, Huan Wang, Zhe Gao, Hang Luo, Lihong Liu, Dou Zhang
Summary: In the field of energy storage, PVDF-based polymers have gained increasing attention due to their high breakdown strength, flexibility, processability, and low cost. This study demonstrates that the performance of P(VDF-TrFE-CTFE) can be significantly improved using a facile drawing strategy, leading to enhanced breakdown strength and energy storage density.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Zulmari Silva Pedraza, Yizhan Wang, Corey Carlos, Zhongmin Tang, Jun Li, Weibo Cai, Xudong Wang
Summary: This study explores the use of piezoelectric microparticles as a method for inducing irreversible electroporation of breast cancer cells. The results show a reduction in cell viability, suggesting that this approach may offer a more benign cancer treatment option.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Hongxia Li, Mingliang Cheng, Yingxin Chen, Gang Du, Junhua Xi, Xin Hu, Xianguo Liu, Xuefeng Zhang, Zhaodong Li
Summary: Introducing a nano-thick transparent ferroelectric P(VDF-TrFE) film on TiO2 effectively enhances the photocurrent density, providing a novel approach for optimizing the catalytic characteristics of PEC photoelectrodes.
APPLIED SURFACE SCIENCE
(2021)