Chen Xiaoliang, Li Xiangming, Shao Jinyou, An Ningli, Tian Hongmiao, Wang Chao, Han Tianyi, Wang Li, Lu Bingheng
State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong, University, Xi'an, Shaanxi, 710049, China.
College of Printing and Packaging Engineering, Xi'an University of Technology, Xi'an, Shaanxi, 710048, China.
Small. 2017 Jun;13(23). doi: 10.1002/smll.201604245. Epub 2017 Apr 28.
Piezoelectric nanogenerators with large output, high sensitivity, and good flexibility have attracted extensive interest in wearable electronics and personal healthcare. In this paper, the authors propose a high-performance flexible piezoelectric nanogenerator based on piezoelectrically enhanced nanocomposite micropillar array of polyvinylidene fluoride-trifluoroethylene (P(VDF-TrFE))/barium titanate (BaTiO ) for energy harvesting and highly sensitive self-powered sensing. By a reliable and scalable nanoimprinting process, the piezoelectrically enhanced vertically aligned P(VDF-TrFE)/BaTiO nanocomposite micropillar arrays are fabricated. The piezoelectric device exhibits enhanced voltage of 13.2 V and a current density of 0.33 µA cm , which an enhancement by a factor of 7.3 relatives to the pristine P(VDF-TrFE) bulk film. The mechanisms of high performance are mainly attributed to the enhanced piezoelectricity of the P(VDF-TrFE)/BaTiO nanocomposite materials and the improved mechanical flexibility of the micropillar array. Under mechanical impact, stable electricity is stably generated from the nanogenerator and used to drive various electronic devices to work continuously, implying its significance in the field of consumer electronic devices. Furthermore, it can be applied as self-powered flexible sensor work in a noncontact mode for detecting air pressure and wearable sensors for detecting some human vital signs including different modes of breath and heartbeat pulse, which shows its potential applications in flexible electronics and medical sciences.
具有高输出、高灵敏度和良好柔韧性的压电纳米发电机在可穿戴电子设备和个人医疗保健领域引起了广泛关注。在本文中，作者提出了一种基于聚偏二氟乙烯-三氟乙烯（P(VDF-TrFE)）/钛酸钡（BaTiO₃）的压电增强纳米复合微柱阵列的高性能柔性压电纳米发电机，用于能量收集和高灵敏度自供电传感。通过可靠且可扩展的纳米压印工艺，制备了压电增强的垂直排列的P(VDF-TrFE)/BaTiO₃纳米复合微柱阵列。该压电器件表现出13.2 V的增强电压和0.33 μA/cm²的电流密度，相对于原始的P(VDF-TrFE)体膜提高了7.3倍。高性能的机制主要归因于P(VDF-TrFE)/BaTiO₃纳米复合材料的压电增强以及微柱阵列机械柔韧性的提高。在机械冲击下，纳米发电机稳定地产生电能，并用于驱动各种电子设备持续工作，这意味着其在消费电子设备领域的重要性。此外，它可以用作非接触模式下检测气压的自供电柔性传感器以及检测包括不同呼吸和心跳脉冲模式在内的一些人体生命体征的可穿戴传感器，这显示了其在柔性电子学和医学领域的潜在应用。
