Department of Chemistry and Biochemistry and the Science of Advanced Materials (SAM) Program, Central Michigan University , Mt. Pleasant, Michigan 48858, United States.
ACS Appl Mater Interfaces. 2014 Oct 22;6(20):17506-17. doi: 10.1021/am502547h. Epub 2014 Oct 7.
Highly uniform polymer-ceramic nanocomposite films with high energy density values were fabricated by exploiting the unique ability of monodomain, nonaggregated BaTiO3 colloidal nanocrystals to function as capacitive building blocks when dispersed into a weakly interacting dielectric matrix. Monodisperse, surface-functionalized ferroelectric 15 nm BaTiO3 nanoparticles have been selectively incorporated with a high packing density into poly(vinylidene fluoride-co-hexafluoropropene) (P(VDF-HFP)) leading to the formation of biphasic BaTiO3-P(VDF-HFP) nanocomposite films. A systematic investigation of the electrical properties of the nanocomposites by electrostatic force microscopy and conventional dielectric measurements reveals that polymer-ceramic film capacitor structures exhibit a ferroelectric relaxor-type behavior with an increased intrinsic energy density. The composite containing 7% BaTiO3 nanocrystals displays a high permittivity (ε = 21) and a relatively high energy density (E = 4.66 J/cm(3)) at 150 MV/m, which is 166% higher than that of the neat polymer and exceeds the values reported in the literature for polymer-ceramic nanocomposites containing a similar amount of nanoparticle fillers. The easy processing and electrical properties of the polymer-ceramic nanocomposites make them suitable for implementation in pulse power capacitors, high power systems and other energy storage applications.
通过利用单畴、无聚集的 BaTiO3 胶体纳米晶体的独特能力，当分散到弱相互作用的介电基质中时，可将其作为电容构建块，从而制备出具有高能量密度值的高度均匀的聚合物-陶瓷纳米复合材料薄膜。已经有选择地将具有高堆积密度的单分散、表面功能化的铁电 15nm BaTiO3 纳米颗粒掺入聚偏二氟乙烯-共六氟丙烯（P(VDF-HFP)）中，形成两相 BaTiO3-P(VDF-HFP)纳米复合材料薄膜。通过静电力显微镜和常规介电测量对纳米复合材料的电性能进行了系统研究，结果表明聚合物-陶瓷膜电容器结构表现出具有铁电弛豫型行为的特性，其固有能量密度增加。含有 7%BaTiO3 纳米晶的复合材料在 150MV/m 时具有高介电常数（ε=21）和相对高的能量密度（E=4.66J/cm3），比纯聚合物高 166%，超过了文献中报道的具有类似纳米颗粒填充量的聚合物-陶瓷纳米复合材料的数值。聚合物-陶瓷纳米复合材料易于加工和具有电性能，使其适合于脉冲功率电容器、高功率系统和其他储能应用。
