Fabrication and magnetoelectric investigation of flexible PVDF-TrFE/cobalt ferrite nanocomposite films
Fabrication and magnetoelectric investigation of flexible PVDF-TrFE/cobalt ferrite nanocomposite films
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DOI：
10.1088/2053-1591/ac6151
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发表时间：
2022-03
影响因子：
2.3
通讯作者：
B. Sapkota;M. Hasan;Alix Martin;R. Mahbub;J. Shield;V. Rangari
中科院分区：
文献类型：
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作者：
B. Sapkota;M. Hasan;Alix Martin;R. Mahbub;J. Shield;V. Rangari
以铁酸钴纳米颗粒(CFN)为铁磁性成分，聚偏氟乙烯-三氟乙烯(PVDF-TrFE)共聚物为铁电基质，采用叶片镀膜法制备了柔性纳米复合薄膜。采用两步法制备了纳米复合薄膜，第一步采用声化学法合成了钴铁氧体(CoFe2O4)纳米颗粒，然后将不同质量分数(0、2.5、5和10%)的钴铁氧体纳米颗粒掺入PVDF-TrFE中形成纳米复合材料。X-射线衍射仪证实了聚偏氟乙烯-三氟乙烯的铁电极性β相。薄膜的热性能研究表明，纳米粒子的加入显著提高了纳米复合薄膜的热性能。研究了纯聚合物/复合薄膜的铁电性能，发现PVDF-TrFE复合薄膜在CFN含量为5wt%时的最大极化比PVDF-TrFE薄膜有明显的改善。对合成的聚偏氟乙烯和聚合物纳米复合材料的磁性能进行了研究，室温下的磁饱和度为53.7emu/g，而10%的钴铁氧体-(PVDFTrFE)纳米复合材料的磁饱和度为27.6emu/g。最后，力学研究表明，当纳米粒子在共聚物基质中的负载量达到5wt%时，薄膜的机械强度增加，然后降低。这意味着所获得的薄膜可以适用于柔性电子设备。
Flexible nanocomposite films, with cobalt ferrite nanoparticles (CFN) as the ferromagnetic component and polyvinylidene fluoride–trifluoroethylene (PVDF-TrFE) copolymer as the ferroelectric matrix, were fabricated using a blade coating technique. Nanocomposite films were prepared using a two-step process; the first process involves the synthesis of cobalt ferrite (CoFe2O4) nanoparticles using a sonochemical method, and then incorporation of various weight percentages (0, 2.5, 5, and 10%) of cobalt ferrite nanoparticles into the PVDF-TrFE to form nanocomposites. The ferroelectric polar β phase of PVDF-TrFE was confirmed by x-ray diffraction (XRD). Thermal studies of films showed notable improvement in the thermal properties of the nanocomposite films with the incorporation of nanoparticles. The ferroelectric properties of the pure polymer/composite films were studied, showing a significant improvement of maximum polarization upon 5wt% CFN loading in PVDF-TrFE composite films compared to the PVDF-TrFE film. The magnetic properties of as-synthesized CFN and the polymer nanocomposites were studied, showing a magnetic saturation of 53.7 emu g−1 at room temperature, while 10% cobalt ferrite-(PVDF-TrFE) nanocomposite shows 27.6 emu/g. We also describe a process for fabricating high optical quality pure PVDF-TrFE and pinhole-free nanocomposite films. Finally, the mechanical studies revealed that the mechanical strength of the films increases up to 5 wt% loading of the nanoparticles in the copolymer matrix and then decreases. This signifies that the obtained films could be suited for flexible electronics.