Li Meilin, Jiang Bei, Cao Shuoang, Song Xinyi, Zhang Yuanqiao, Huang Lijun, Yuan Quanping
School of Resources, Environment and Materials, Guangxi University Nanning 530004 China
State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi University Nanning 530004 China.
RSC Adv. 2023 Mar 31;13(15):10204-10214. doi: 10.1039/d3ra00604b. eCollection 2023 Mar 27.
High-performance flexible barium titanate (BaTiO)-based piezoelectric devices have gained much attention. However, it is still a challenge to prepare flexible polymer/BaTiO-based composite materials with uniform distribution and high performance due to the high viscosity of polymers. In this study, novel hybrid BaTiO particles were synthesized with assistance of TEMPO-oxidized cellulose nanofibrils (CNFs) a low-temperature hydrothermal method and explored for their application in piezoelectric composites. Specifically, Ba was adsorbed on uniformly dispersed CNFs with a large amount of negative charge on their surface, which nucleated, resulting in the synthesis of evenly dispersed CNF-BaTiO. The obtained CNF-BaTiO possessed a uniform particle size, few impurities, high crystallinity and dispersity, high compatibility with the polymer substrate and surface activity due to the existence of CNFs. Subsequently, both polyvinylidene fluoride (PVDF) and TEMPO-oxidized CNFs were employed as piezoelectric substrates for the fabrication of a CNF/PVDF/CNF-BaTiO composite membrane with a compact structure, displaying the tensile strength of 18.61 ± 3.75 MPa and elongation at break of 3.06 ± 1.33%. Finally, a thin piezoelectric generator (PEG) was assembled, which output a considerable open-circuit voltage (4.4 V) and short-circuit current (200 nA), and could also power a light-emitting diode and charge a 1 μF capacitor to 3.66 V in 500 s. Its longitudinal piezoelectric constant ( ) was 5.25 ± 1.04 pC N even with a small thickness. It also exhibited high sensitivity to human movement, outputting a voltage of about 9 V and current of 739 nA for only a footstep. Thus, it exhibited good sensing property and energy harvesting property, presenting practical application prospects. This work provides a new idea for the preparation of hybrid BaTiO and cellulose-based piezoelectric composite materials.
高性能柔性钛酸钡（BaTiO）基压电器件备受关注。然而，由于聚合物的高粘度，制备具有均匀分布和高性能的柔性聚合物/BaTiO基复合材料仍然是一项挑战。在本研究中，通过低温水热法在2,2,6,6-四甲基哌啶氧化物（TEMPO）氧化的纤维素纳米纤丝（CNFs）辅助下合成了新型杂化BaTiO颗粒，并探索了其在压电复合材料中的应用。具体而言，Ba吸附在表面带有大量负电荷的均匀分散的CNFs上，成核后，合成了均匀分散的CNF-BaTiO。所获得的CNF-BaTiO具有均匀的粒径、少量杂质、高结晶度和分散性，由于CNFs的存在，与聚合物基体具有高相容性和表面活性。随后，聚偏氟乙烯（PVDF）和TEMPO氧化的CNFs均被用作压电基体，用于制备结构紧凑的CNF/PVDF/CNF-BaTiO复合膜，其拉伸强度为18.61±3.75 MPa，断裂伸长率为3.06±1.33%。最后，组装了一个薄型压电发电机（PEG），其输出可观的开路电压（4.4 V）和短路电流（200 nA），还能为发光二极管供电，并在500 s内将1 μF电容器充电至3.66 V。即使厚度较小，其纵向压电常数（ ）仍为5.25±1.04 pC/N。它对人体运动也表现出高灵敏度，仅一步就能输出约9 V的电压和739 nA的电流。因此，它表现出良好的传感性能和能量收集性能，具有实际应用前景。这项工作为制备杂化BaTiO和纤维素基压电复合材料提供了新思路。
