Abstract The polymer nanocomposites have potential applications in flexible electronics due to its interesting dielectric properties. Hence, flexible nanocomposite films of polyvinylidene fluoride (PVDF) polymer and barium hexaferrite (BHF) nanoparticles with high dielectric constant were prepared by the solution cast method. The dielectric behavior of the materials has been understood by employing the impedance spectroscopy technique. The co-existence of α and β phases of PVDF has been observed from the XRD (X-ray Diffractometer) and FTIR (Fourier-transform infrared spectroscopy) analysis. The ratio of α and β phases of PVDF has a great influence on dielectric, ferroelectric and energy storage density of PVDF-BHF nanocomposites and, it depends upon the concentration of BHF in the nanocomposites. FE-SEM (Field Emission Scanning Electron Microscopy) micrographs reveal that the microstructure of the composite depends upon the concentration of BHF in the PVDF matrix. Dielectric properties of nanocomposite highly depends on microstructure of the PVDF-BHF nanocomposite. This observation has been well explained by considering the BLCs (Barrier Layer capacitances) model. Interestingly, the dielectric constant has been enhanced eighteen (18) times at 1 KHz to that of dielectric constant of PVDF. The dielectric constant increases due to the electrostatics and interfacial interaction between the local electric field of the BHF nanoparticle and CH2/CF2 dipole of PVDF chain. The present study opens a new window for the possible use of PVDF-BHF nanocomposite in dielectric and energy storage device applications.

中文翻译：

---

用于柔性电子和储能应用的聚合物-陶瓷纳米复合材料中介电常数的提高

摘要 聚合物纳米复合材料由于其有趣的介电性能在柔性电子产品中具有潜在的应用。因此，通过溶液浇铸法制备了具有高介电常数的聚偏二氟乙烯 (PVDF) 聚合物和六铁酸钡 (BHF) 纳米颗粒的柔性纳米复合薄膜。通过使用阻抗谱技术已经了解了材料的介电行为。通过 XRD（X 射线衍射仪）和 FTIR（傅里叶变换红外光谱）分析观察到 PVDF 的 α 和 β 相共存。PVDF的α相和β相的比例对PVDF-BHF纳米复合材料的介电、铁电和储能密度有很大影响，并且取决于纳米复合材料中BHF的浓度。FE-SEM（场发射扫描电子显微镜）显微照片显示复合材料的微观结构取决于 PVDF 基体中 BHF 的浓度。纳米复合材料的介电性能高度依赖于 PVDF-BHF 纳米复合材料的微观结构。通过考虑 BLC（势垒层电容）模型已经很好地解释了这一观察结果。有趣的是，在 1 KHz 时，介电常数比 PVDF 的介电常数提高了十八 (18) 倍。由于 BHF 纳米粒子的局部电场与 PVDF 链的 CH2/CF2 偶极子之间的静电和界面相互作用，介电常数增加。本研究为 PVDF-BHF 纳米复合材料在介电和储能设备应用中的可能用途打开了一个新窗口。