Article
Physics, Applied
Zhiqiang Huang, Xiuli Zhang, Xingjia Li, Guodong Zhu, Xiangjian Meng, Zhi Shi, Dandan Zhang, Xiaohui Sun
Summary: The polarization switching behaviors of ultrathin films of ferroelectric poly(vinylidene fluoride-trifluoroethylene) capacitors with different electroactive interlayers have been studied. The high local electric field plays a significant role in the switching results, and optimizing the defect model ensures complete microdynamic switching behavior. Weiss mean field theory is introduced to analyze the nucleation process of defect states, resulting in stable spatial defects alignment. Three hypothetical effects are proposed based on the recovery mechanism of dipole defects, including obedience effect, cooperation effect, and antagonism effect, which are crucial for understanding and controlling defect functionality in ferroelectric materials to achieve reliable applications in ferroelectric memories.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Polymer Science
Zhubing Han, Hancheng Qin, Xin Chen, Wenhan Xu, Yang Liu, J. Bernholc, Qing Wang
Summary: The incorporation of comonomers in PVDF-based ferroelectric polymers has been widely used to modify their structures and properties. Previous studies have shown that large-sized comonomers can induce relaxor ferroelectricity, but this study demonstrates that a small-sized comonomer can preferentially adopt a polar all-trans conformation, resulting in terpolymers with robust ferroelectricity and enhanced transition temperature and coercive field. This work systematically investigates the effects of comonomer size on the microstructures and properties of ferroelectric polymers.
Article
Polymer Science
Thulasinath Raman Venkatesan, David Smykalla, Bernd Ploss, Michael Wuebbenhorst, Reimund Gerhard
Summary: The effects of thermal processing on the micro- and nanostructural features and relaxor-ferroelectric properties of a P(VDF-TrFE-CFE) terpolymer were investigated. Annealing reduces the Curie transition temperature and shifts the ferroelectric phase fraction, leading to relaxor-ferroelectric behavior. Changes in transition temperatures are related to alterations in hysteresis curves.
Article
Nanoscience & Nanotechnology
Qingqing Li, Jinghua Zhao, Baosheng He, Zhijun Hu
Summary: PVDF, a ferroelectric polymer with the polar beta-phase, has the highest dipolar moment and piezoelectric response. The development of flexible electronics highly requires effective methods for producing beta-PVDF.
Article
Nanoscience & Nanotechnology
Zhiwen Zhu, Guanchun Rui, Ruipeng Li, Hezhi He, Lei Zhu
Summary: This study investigated the structure and electrostrictive properties of relaxor ferroelectric (RFE) poly(vinylidene fluoride-cotrifluoroethylene-co-chlorotrifluoroethylene) [P(VDF-TrFE-CTFE)] random terpolymers films to understand the mechanism of electrostriction. It was found that reducing the ferroelectric nonlinearity of the RFE terpolymer led to higher electrostriction performance at lower driving fields, providing a potential pathway for designing new electrostrictive polymers with improved performance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Zengxuan Fan, Martin Schwedes, Jan Schwaderer, Sabine Beuermann, Michael Fischlschweiger
Summary: This study systematically investigates the effect of molecular weight on the formation of electroactive phases in poly(vinylidene fluoride) and clarifies the structure-property relationship. The results show that molecular weight strongly influences the phase behavior of poly(vinylidene fluoride).
MATERIALS RESEARCH LETTERS
(2022)
Article
Chemistry, Physical
Dong Je Han, Seonwoo Kim, Hyeon Jun Heo, Chaewon Jin, Jin-young Kim, Hongsoo Choi, In Jun Park, Hong Suk Kang, Sang Goo Lee, Jong-Chan Lee, Eun-Ho Sohn
Summary: Antimicrobial PVDF-based polymers were prepared by grafting quaternary ammonium or quaternary pyridinium monomers to effectively kill bacteria and yeast. Adding these polymers to PVDF films through blending method enhanced both mechanical properties and antimicrobial performances, while maintaining biocompatibility.
APPLIED SURFACE SCIENCE
(2021)
Article
Polymer Science
Zhubing Han, Yang Liu, Xin Chen, Wenhan Xu, Qing Wang
Summary: This study enhances the longitudinal piezoelectric coefficients of PVDF-based ferroelectric polymers through the synthesis and characterization of terpolymers. The terpolymers exhibit a mixture of ferroelectric and relaxor phases, with the best piezoelectric performance observed in the terpolymer with a composition of VDF/TrFE/CTFE = 64.5/33.1/2.4 mol%. The introduction of CTFE facilitates the formation of the relaxor phase.
Article
Engineering, Chemical
Qian Wang, Linhe Zhu, Norafiqah Ismail, Qiuyueming Zhou, Ting He, Yue Zhou, Zhaohui Wang, Zhaoliang Cui, Naser Tavajohi
Summary: This study reports a new method for fabricating electroactive membranes, using a P(VDF-TrFE)/PVP/DMAc/water system to tailor the membrane structure. Glycerin was used during annealing to preserve the integrity of the membranes. Annealed P(VDF-TrFE) membranes exhibited high crystallinity and superior physicochemical properties, resulting in excellent anti-fouling performance. This work provides a facile method for designing highly crystalline membranes with potential applications in filtration systems, smart wearable devices, and medicine.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Review
Polymer Science
Xiao Bai, Haikuo Li, Xiao Chu, Mengling Liu, Huihui Li, Haijun Wang, Xiaoli Sun, Shouke Yan
Summary: This article systematically summarizes the crystalline structure, phase transition, and crystal orientation of P(VDF-TrFE) and discusses the influence of factors such as annealing, blending, and electric field on its properties and behavior.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Chemistry, Applied
B. Hermenegildo, C. Ribeiro, N. Perinka, P. Martins, M. Trchova, M. Hajna, J. Stejskal, S. Lanceros-Mendez
Summary: Electrospun membranes with an active response play an important role in tissue regeneration by improving the ability to mimic the cellular microenvironment. This study developed PVDF electrospun fibers coated with PANI and PPy, which showed increased surface electrical conductivity and hydrophilicity while remaining biocompatible, resulting in slight enhancement in metabolic activity of L929 fibroblasts.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Polymer Science
Jia-Yi Ren, Qing-Feng Ouyang, Guo-Qi Ma, Yue Li, Jun Lei, Hua-Dong Huang, Li-Chuan Jia, Hao Lin, Gan-Ji Zhong, Zhong-Ming Li
Summary: This study proposes an efficient method to enhance the dielectric and ferroelectric properties of PVDF films through thermal treatment combined with pressure field. The appropriate pressure and temperature fields promote the alignment and phase transformation of PVDF films, resulting in films with high orientation and perfect beta-crystallites. These films exhibit enhanced dielectric and ferroelectric properties.
Article
Multidisciplinary Sciences
Liang Gao, Ben-Lin Hu, Linping Wang, Jinwei Cao, Ri He, Fengyuan Zhang, Zhiming Wang, Wuhong Xue, Huali Yang, Run-Wei Li
Summary: In this study, we developed intrinsically elastic ferroelectrics by combining the ferroelectric response and elastic resilience into one material through slight cross-linking of plastic ferroelectric polymers. This elastic ferroelectric exhibits a stable ferroelectric response under mechanical deformation up to 70% strain and has potential applications in wearable electronics, such as elastic ferroelectric sensors, information storage, and energy transduction.
Article
Chemistry, Multidisciplinary
Chenchen Wang, Yang Zhang, Bowen Zhang, Bo Wang, Jinxi Zhang, Long-Qing Chen, Qiming Zhang, Zhong Lin Wang, Kailiang Ren
Summary: Flexoelectricity-induced flexophotovoltaic effect has been demonstrated in a KNN/PVDF-TrFE nanocomposite, significantly enhancing the photovoltaic current. The curved K/P-20 composite shows a 13.9% increase in the photovoltaic current compared to the flat nanocomposite, indicating great potential for PVDF-based nanocomposites in ferroelectric memory device applications.
Article
Polymer Science
Da Shen, Qilong Zhang, Zhao Zhang, Hui Yang, Jiansong Sheng
Summary: A feasible method was designed to prepare composite films with high permittivity and enhanced hydrophobic performance. The composite, made of TiO2 nanowire arrays and P(VDF-TrFE), showed good dielectric properties and improved wettability due to a microrough structure built by P(VDF-TrFE) nanofibers.
