Panda Subhasree, Pasha S K Khadheer
Functional Nanomaterials and Polymer Nanocomposite Laboratory, Department of Physics, VIT-AP University, Amaravati, Guntur, Andhra Pradesh 522241, India.
Langmuir. 2023 Sep 19;39(37):13345-13358. doi: 10.1021/acs.langmuir.3c02055. Epub 2023 Sep 7.
A simple solution casting technique was used to fabricate perovskite strontium titanate (SrTiO)-loaded poly(vinylidenefluoride--hexafluoropropylene) (PVDF-HFP) nanocomposite films for efficient energy storage applications. Various microscopic and spectroscopic methods were used to study the characteristics of the polymer nanocomposite films, like Fourier transform infrared spectroscopy (FTIR), X-ray diffraction technique (XRD), field emission scanning electron microscopy (FESEM), ultraviolet-visible spectroscopy, thermogravimetric analysis, and mechanical tensile test (stress vs strain). The FTIR, XRD, and FESEM analyses confirmed the incorporation and proper dispersion of SrTiO nanoparticles in the PVDF-HFP polymer matrix. An improvement in the optical, thermal, and mechanical behavior of the nanocomposite film was observed compared to the pure polymer. The values of dielectric constant, loss tangent, and AC conductivity of pure PVDF-HFP polymer and PVDF-HFP/SrTiO nanocomposites (2, 6, and 10 wt % SrTiO loadings) were analyzed in a temperature and frequency span of 30-150 °C and 1-100 kHz, respectively. To better understand the electrical properties of the materials, Nyquist plots were generated, and their related circuit designs were fitted. The 2 wt % SrTiO loaded nanocomposite exhibited the highest dielectric enhancement and AC conductivity compared to higher filler-loaded nanocomposites. This exceptional dielectric enhancement at very small filler loading is beneficial for commercialization and economically viable for real-time applications.
采用一种简单的溶液浇铸技术制备了用于高效储能应用的负载钙钛矿钛酸锶（SrTiO）的聚偏氟乙烯-六氟丙烯（PVDF-HFP）纳米复合薄膜。使用了各种微观和光谱方法来研究聚合物纳米复合薄膜的特性，如傅里叶变换红外光谱（FTIR）、X射线衍射技术（XRD）、场发射扫描电子显微镜（FESEM）、紫外可见光谱、热重分析和机械拉伸试验（应力与应变）。FTIR、XRD和FESEM分析证实了SrTiO纳米颗粒在PVDF-HFP聚合物基体中的掺入和适当分散。与纯聚合物相比，观察到纳米复合薄膜的光学、热学和力学性能有所改善。分别在30-150°C的温度范围和1-100 kHz的频率范围内分析了纯PVDF-HFP聚合物以及PVDF-HFP/SrTiO纳米复合材料（SrTiO负载量为2、6和10 wt%）的介电常数、损耗角正切和交流电导率。为了更好地理解材料的电学性能，绘制了奈奎斯特图，并对其相关电路设计进行了拟合。与更高填料负载的纳米复合材料相比，负载2 wt% SrTiO的纳米复合材料表现出最高的介电增强和交流电导率。在非常低的填料负载量下这种优异的介电增强有利于商业化，并且对于实时应用在经济上是可行的。
