Luo Jun, Deng Jizhong, Wu Zhiyi, Wang Yuanyu
College of Materials and Metallurgy, Guizhou University, Guizhou 550025, China.
International Institute for Interdisciplinary and Frontiers, Beihang University, Beijing 1000191, P. R. China.
Langmuir. 2025 Aug 5;41(30):20227-20236. doi: 10.1021/acs.langmuir.5c02546. Epub 2025 Jul 25.
In this study, BiNaNbO (BNN5)/poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) piezoelectric composite films were prepared via electrospinning technology. Meanwhile, the uniaxial intermittent alternating dual-spray method was employed to obtain composite films with alternating concentration variations of BNN5, which were then utilized to fabricate piezoelectric nanogenerators (PENGs). Among them, the composite film with a BNN5 content of 3/5 wt % exhibited the optimal β-phase proportion, reaching 85.1%. The piezoelectric output performance of this composite film was significantly enhanced: it had an output voltage as high as 25.3 V, which was 339.2% higher than that of the P(VDF-TrFE) film and 54.7% higher than that of the 4 wt % composite film with the same concentration. When the resistive load was 1 MΩ, the peak instantaneous output power was 38.3 μW, with a calculated current of 6.2 μA and an output power density of 5.1 μW/cm. Both the current and power were higher than those of most reported PVDF/P(VDF-TrFE)-based piezoelectric films. The durability test with over 2200 cycles demonstrated that the piezoelectric composite film had excellent mechanical stability. This work presents a strategy to boost the output performance of piezoelectric composite films, namely, fabricating P(VDF-TrFE) composite films using the uniaxial intermittent alternating dual-spray technique, to meet the requirements of wearable and flexible electronic devices.
在本研究中，通过静电纺丝技术制备了铋钠铌氧（BNN5）/聚（偏二氟乙烯-三氟乙烯）（P（VDF-TrFE））压电复合薄膜。同时，采用单轴间歇交替双喷法获得了BNN5浓度交替变化的复合薄膜，然后将其用于制造压电纳米发电机（PENGs）。其中，BNN5含量为3/5 wt%的复合薄膜表现出最佳的β相比例，达到85.1%。该复合薄膜的压电输出性能显著增强：其输出电压高达25.3 V，比P（VDF-TrFE）薄膜高339.2%，比相同浓度的4 wt%复合薄膜高54.7%。当电阻负载为1 MΩ时，峰值瞬时输出功率为38.3 μW，计算电流为6.2 μA，输出功率密度为5.1 μW/cm²。电流和功率均高于大多数已报道的基于PVDF/P（VDF-TrFE）的压电薄膜。超过2200次循环的耐久性测试表明，该压电复合薄膜具有优异的机械稳定性。这项工作提出了一种提高压电复合薄膜输出性能的策略，即使用单轴间歇交替双喷技术制备P（VDF-TrFE）复合薄膜，以满足可穿戴和柔性电子设备的要求。
