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首页> 外文期刊>Advanced Functional Materials >Enhancement of Electrical Properties of Ferroelectric Polymers by Polyaniline Nanofibers with Controllable Conductivities
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Enhancement of Electrical Properties of Ferroelectric Polymers by Polyaniline Nanofibers with Controllable Conductivities

机译：可控电导率的聚苯胺纳米纤维增强铁电聚合物的电性能

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摘要

Conductive nanofibers are adopted to enhance the electric properties of ferroelectric polymers. Polyaniline (PANI) nanofibers doped by protonic acids have a high dispersion stability in vinylidene fluoride-trifiuoroethylene copolymers [P(VDF-TrFE)] and lead to percolative nanocomposites with enhanced electric responses. About a 50-fold rise in the dielectric constant of the ferroelectric polymer matrix has been achieved. Percolation thresholds of the nanocomposites are relevant to doping levels of PANI nanofibers and can be as low as 2.9 wt% for fully doped nanofibers. The interface between the conductive nanofiber and the polymer matrix plays a crucial role in the dielectric enhancement of the nanocomposites in the vicinity of the percolation threshold. Compared with other dopants, perfluorosulfonic acid resin is better at improving the performance of the nanofibers in that it serves as a surface passivation layer for the conductive fillers and suppresses leakage current at low frequency. The nanofibers drastically reduce the electric field strength required to switch spontaneous polarization of P(VDF-TrFE). The nanocomposites can be utilized for potential applications as high energy density capacitors, thin-film transistors, and non-volatile ferroelectric memories.
机译：导电纳米纤维被用来增强铁电聚合物的电性能。质子酸掺杂的聚苯胺（PANI）纳米纤维在偏二氟乙烯-三氟乙烯共聚物[P（VDF-TrFE）]中具有较高的分散稳定性，并导致电响应增强的渗透性纳米复合材料。铁电聚合物基体的介电常数已经提高了约50倍。纳米复合材料的渗透阈值与PANI纳米纤维的掺杂水平有关，对于完全掺杂的纳米纤维，渗透阈值可低至2.9 wt％。导电纳米纤维和聚合物基质之间的界面在渗透阈值附近对纳米复合材料的介电增强起着至关重要的作用。与其他掺杂剂相比，全氟磺酸树脂在改善纳米纤维的性能方面具有更好的优势，因为它可以用作导电填料的表面钝化层并抑制低频泄漏电流。纳米纤维大大降低了切换P（VDF-TrFE）的自发极化所需的电场强度。纳米复合材料可用于潜在的应用，如高能量密度电容器，薄膜晶体管和非易失性铁电存储器。

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