Chai Bin, Shi Kunming, Wang Yalin, Liu Yijie, Liu Fei, Zhu Lei, Huang Xingyi
Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, Department of Polymer Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
ACS Nano. 2024 Sep 10;18(36):25216-25225. doi: 10.1021/acsnano.4c07480. Epub 2024 Aug 23.
Flexible ferroelectric materials are in high demand in emerging energy harvesting and self-powered sensing electronics. However, current flexible ferroelectric polymers, such as poly(vinylidene fluoride) (PVDF) and P(VDF--trifluoroethylene) [P(VDF-TrFE)], cannot fulfill the requirement of emerging applications because of their low piezoelectric/pyroelectric performance. In this work, using organic-inorganic hybrid perovskite [(4-aminotetrahydropyran)PbBrCl] ferroelectric nanorods as reinforcement and P(VDF-TrFE) as the matrix, we prepared flexible core-sheath piezoelectric nanofibers and pyroelectric nanocomposite films. The core-sheath nanofibers possess a record-high piezoelectric coefficient of 78.1 pC·N, and the output voltage reaches to 192 V, with the maximum power density of 1.04 W·m. On the other hand, the nanocomposite film exhibits a high pyroelectric coefficient of 58.2 μC·m·K at 333 K, which yields a voltage of 6.1 V under 6.6 K temperature fluctuation. An integrated flexible sensing device was prepared by combining piezoelectric nanofibers and pyroelectric films, which can wirelessly detect vibration and temperature fluctuation simultaneously. The integrated device is suitable for pipelines, power equipment, and other scenarios, where vibration and temperature need to be monitored at the same time.
柔性铁电材料在新兴的能量收集和自供电传感电子领域有着很高的需求。然而，目前的柔性铁电聚合物，如聚偏氟乙烯（PVDF）和聚（偏氟乙烯-三氟乙烯）[P（VDF-TrFE）]，由于其低压电/热释电性能，无法满足新兴应用的要求。在这项工作中，我们以有机-无机杂化钙钛矿[（4-氨基四氢吡喃）PbBrCl]铁电纳米棒作为增强体，P（VDF-TrFE）作为基体，制备了柔性核壳结构压电纳米纤维和热释电纳米复合薄膜。核壳纳米纤维具有创纪录的78.1 pC·N的高压电系数，输出电压达到192 V，最大功率密度为1.04 W·m。另一方面，纳米复合薄膜在333 K时表现出58.2 μC·m·K的高热释电系数，在6.6 K的温度波动下产生6.1 V的电压。通过将压电纳米纤维和热释电薄膜相结合制备了一种集成柔性传感装置，该装置可以同时无线检测振动和温度波动。该集成装置适用于管道、电力设备等需要同时监测振动和温度的场景。
