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{"title":"Evaluation of ferroelectric profile of poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) thin films by positive-up–negative-down and fatigue measurement","authors":"G Hassnain Jaffari, Musfira Aqeel","doi":"10.1002/pi.6609","DOIUrl":null,"url":null,"abstract":"<p>Organic polymers are of interest due to their numerous promising potential applications in the area of energy harvesting and sensing. In this context, piezoelectric and ferroelectric polymers are subject to intense research; however, it is challenging to understand polarization switching in such systems. The focus of the present study is to thoroughly evaluate the finer details of polarization reversal in poly(vinylidene fluoride-<i>co</i>-trifluoroethylene) (P(VDF-TrFE)) thin films. The intrinsic features arising from the true values of (switching) polarization and extrinsic features associated with the presence of non-switching contributions, i.e. leakage current and linear dielectric component, have been investigated using the positive-up–negative-down technique. These contributions are quantified and discussed. Furthermore, fatigue endurance has been examined by repeated switching cycles. Increase in polarization increases is associated with the improved crystallinity and enhancement of the β-phase. However, a higher degree of crystallinity, for extended numbers of repeated cycles of the bipolar electric field, resulted in degradation of the (switching) polarization. Fatigue significantly affects the leakage and ferroelectric components while the paraelectric contribution remains almost constant. The underlying mechanism of such trends are discussed in terms of hysteresis losses. © 2023 Society of Industrial Chemistry.</p>","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":"73 4","pages":"261-269"},"PeriodicalIF":2.9000,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Polymer International","FirstCategoryId":"92","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/pi.6609","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
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Abstract
Organic polymers are of interest due to their numerous promising potential applications in the area of energy harvesting and sensing. In this context, piezoelectric and ferroelectric polymers are subject to intense research; however, it is challenging to understand polarization switching in such systems. The focus of the present study is to thoroughly evaluate the finer details of polarization reversal in poly(vinylidene fluoride-co -trifluoroethylene) (P(VDF-TrFE)) thin films. The intrinsic features arising from the true values of (switching) polarization and extrinsic features associated with the presence of non-switching contributions, i.e. leakage current and linear dielectric component, have been investigated using the positive-up–negative-down technique. These contributions are quantified and discussed. Furthermore, fatigue endurance has been examined by repeated switching cycles. Increase in polarization increases is associated with the improved crystallinity and enhancement of the β-phase. However, a higher degree of crystallinity, for extended numbers of repeated cycles of the bipolar electric field, resulted in degradation of the (switching) polarization. Fatigue significantly affects the leakage and ferroelectric components while the paraelectric contribution remains almost constant. The underlying mechanism of such trends are discussed in terms of hysteresis losses. © 2023 Society of Industrial Chemistry.
通过正-上-负-下和疲劳测量评估 PVDF-TrFE 薄膜的铁电曲线
有机聚合物在能量收集和传感领域的应用前景广阔,因此备受关注。在此背景下,压电聚合物和铁电聚合物受到了广泛的研究,然而,要了解此类系统中的极化转换却很有挑战性。本研究的重点是彻底评估聚偏氟乙烯-共三氟乙烯(P(VDF-TrFE))薄膜中极化反转的更多细节。利用正-上-负-下(PUND)技术研究了(切换)极化真实值产生的内在特征以及与非切换贡献(即泄漏电流和线性介电分量)存在相关的外在特征。对这些贡献进行了量化和讨论。此外,还通过重复开关周期对疲劳耐久性进行了检验。极化增加与结晶度提高和 β 相增强有关。然而,结晶度越高,双极电场重复循环次数越多,(切换)极化就越弱。疲劳严重影响漏电和铁电成分,而副电成分几乎保持不变。本文受版权保护。本文受版权保护。
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