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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Size-dependent piezoelectric and mechanical properties of electrospun P(VDF-TrFE) nanofibers for enhanced energy harvesting
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Size-dependent piezoelectric and mechanical properties of electrospun P(VDF-TrFE) nanofibers for enhanced energy harvesting

机译：电纺P（VDF-TrFE）纳米纤维的尺寸依赖性压电和机械性能，可增强能量收集

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Piezoelectricity-based energy harvesting from wasted mechanical energies has garnered an increasing attention as a clean energy source. Especially, flexible organic piezoelectric materials provide an opportunity to exploit their uses in mechanically challenging areas where brittle inorganic counterparts have mechanical limitations. In this regard, electrospinning has shown its advantages of producing poly(vinylidene fluoride) (PVDF)-based nanofibrous structures without the necessity of a secondary processing to induce/increase piezoelectric properties. However, the effects of electrospun fiber dimension, one of the main morphological parameters in electrospun fibers, on piezoelectricity have not been fully understood. In this study, two dependent design of experiments (DOEs) were utilized to systematically control the dimensions of electrospun poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) to produce nanofibers having their diameter ranging from 1000 to sub-100 nm. Such a dimensional reduction resulted in the increase of piezoelectric responsible electroactive phase content and the degree of crystallinity. These changes in crystal structure led to approximately 2-fold increase in piezoelectric constant as compared to typical P(VDF-TrFE) thin films. More substantially, the dimensional reduction also increased the Young's modulus of the nanofibers up to approximately 80-fold. The increases in piezoelectric constant and Young's modulus collectively enhanced piezoelectric performance, resulting in the exponential increase in electric output of nanofiber mats when the fiber diameters were reduced from 860 nm down to 90 nm. Taken together, the results suggest a new strategy to improve the piezoelectric performance of electrospun P(VDF-TrFE) via optimization of their electromechanical and mechanical properties.
机译：从浪费的机械能中收集基于压电的能量已经越来越受到人们的关注，作为清洁能源。特别是，柔性有机压电材料提供了在易碎的无机材料具有机械限制的机械挑战性领域中开发其用途的机会。在这方面，静电纺丝已显示出其生产基于聚偏二氟乙烯（PVDF）的纳米纤维结构的优点，而无需进行二次处理来诱导/提高压电性能。然而，电纺纤维尺寸（电纺纤维中的主要形态参数之一）对压电性的影响尚未完全了解。在这项研究中，利用两个相关的实验设计（DOE）来系统地控制电纺聚偏二氟乙烯-三氟乙烯（P（VDF-TrFE））的尺寸，以生产直径范围为1000至100 nm以下的纳米纤维。这种尺寸减小导致压电有效电活性相含量和结晶度的增加。与典型的P（VDF-TrFE）薄膜相比，晶体结构的这些变化导致压电常数大约增加2倍。更实质地，尺寸减小还使纳米纤维的杨氏模量增加了多达约80倍。压电常数和杨氏模量的增加共同提高了压电性能，导致当纤维直径从860 nm减小到90 nm时纳米纤维垫的电输出呈指数增长。两者合计，结果提出了一种新的策略，通过优化其电机械性能和机械性能来改善电纺P（VDF-TrFE）的压电性能。

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