Abstract
As a representative piezoelectric polymer, poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) has been widely used in sensors transducers and actuators. In this paper, gold nanoparticles (AuNPs) are prepared and doped into the PVDF-HFP solution to enhance the piezoelectric property of electrospun PVDF-HFP nanowires. The results indicate that proper amounts of AuNPs within the nanowires can improve the piezoelectric phase in PVDF-HFP. Then, a nanogenerator was prepared using the PVDF-HFP/Au nanowires to verify the increase in piezoelectric performance. Experimental results show that compared with PVDF-HFP nanogenerator without AuNPs doping, the output voltage is increased by about two times, while the output current is doubled for the PVDF-HFP/Au nanogenerator. Furthermore, systematic molecular dynamics (MD) simulations are conducted to elucidate the physical mechanism of AuNPs enhanced β-phase formation in PVDF-HFP. Our results show that the adsorption and electrostatic interaction between the AuNPs and the PVDF chains promote the electroactive β-phase formation, and also significantly increase the tension and poling effect during electrospinning process, which is the origin of the enhanced electroactive phase formation in electrospun PVDF-HFP nanowires.
摘要
聚偏氟乙烯-六氟丙烯(PVDF-HFP)作为一种具有代表性的压电聚合物, 已广泛应用于传感器和制动器中. 本文制备了金纳米 颗粒(AuNP), 并将其掺杂到PVDF-HFP溶液中, 以增强电纺PVDF-HFP纳米线的压电性能. 结果表明, 在纳米线中加入适量的AuNP 可以改善PVDF-HFP中的压电相. 然后, 使用PVDF-HFP/Au纳米线制备了纳米发电机, 以验证压电性能的提高. 实验结果表明, 与未 掺杂AuNPs的PVDF-HFP纳米发电机相比, PVDF-HFP/Au纳米发电机的输出电压提高了约两倍, 输出电流增加了一倍. 此外, 还进 行了系统的分子动力学模拟, 以阐明AuNPs增强PVDF-HFP中的β相形成的物理机制. 结果表明, AuNPs和PVDF链之间的吸附和静 电相互作用促进了电活性β相的形成, 也显著增加了静电纺丝过程中的张力和极化效应, 这是静电纺丝PVDF-HFP纳米线中增强的 压电相形成的根源.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 12075191 and 11972272).
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Zhou, X., Suo, T. Enhanced electroactive β-phase formation in electrospun poly (vinylidene fluoride-co-hexafluoropropylene) nanowires with gold nanoparticles. Acta Mech. Sin. 38, 122015 (2022). https://doi.org/10.1007/s10409-022-09036-x
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DOI: https://doi.org/10.1007/s10409-022-09036-x