The geometry of piezoelectric materials has a great impact on the output performance of piezoelectric nanogenerators (PNGs), a promising candidate for providing electricity in wireless systems. The nanohelix has been considered as a hopeful nanostructure for PNGs due to the geometrical stress confinement effect and has been demonstrated by finite element analysis. Herein, helical nanobelts of graphene/poly(vinylidenefluoride‐co‐trifluoroethylene) (PVDF–TrFE) and multiwalled carbon nanotube (MWCNT)/PVDF–TrFE hybrids are prepared using a direct‐write technique. The PNGs based on these helical nanobelts are fabricated and effectively harness mechanical energy to generate electricity. The output voltages of the PNGs based on the pure helical PVDF–TrFE, MWCNT (0.03 wt%)/PVDF–TrFE, and graphene (0.03 wt%)/PVDF–TrFE nanobelts are recorded. The average outputs of the three kinds of PVDF helical nanobelts are approximately 10.3, 11.9, and 20.7 mV, respectively. The maximum of output voltage of 35 mV is achieved using the graphene (0.005 wt%)/PVDF–TrFE nanobelts. Geometrical stress confinement is identified as a mechanism responsible for high piezoelectricity in nanostructures, rendering the helical nanogenerators potentially advantageous for efficient energy harvesting.

中文翻译：

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基于螺旋碳材料的压电纳米发电机和具有增强的能量收集性能的聚偏二氟乙烯-三氟乙烯杂化体

压电材料的几何形状对压电纳米发电机（PNG）的输出性能有很大影响，压电纳米发电机是在无线系统中提供电能的有希望的候选者。由于几何应力限制效应，纳米螺旋被认为是PNG的理想纳米结构，并已通过有限元分析得到证明。在此，使用直接写入技术制备了石墨烯/聚偏二氟乙烯-共-三氟乙烯（PVDF-TrFE）和多壁碳纳米管（MWCNT）/ PVDF-TrFE杂化体的螺旋纳米带。制造了基于这些螺旋纳米带的PNG，可以有效利用机械能发电。记录基于纯螺旋PVDF-TrFE，MWCNT（0.03 wt％）/ PVDF-TrFE和石墨烯（0.03 wt％）/ PVDF-TrFE纳米带的PNG的输出电压。三种PVDF螺旋纳米带的平均输出分别约为10.3、11.9和20.7 mV。使用石墨烯（0.005 wt％）/ PVDF-TrFE纳米带可获得35 mV的最大输出电压。几何应力限制被认为是负责纳米结构中高压电性的机制，使得螺旋纳米发电机潜在地有利于有效的能量收集。