Ag-NBCTO-PVDF composites with enhanced dielectric properties

作者：Su, Yanli^*; Gu, Yiqi; Li, Hua; Geng, Fengxia

来源：Materials Letters, 2016, 185: 208-210.

DOI：10.1016/j.matlet.2016.08.136

• Ceramics
• Polymers
• Composites
• Dielectric properties
• Percolation threshold

Three-phase composites with enhanced dielectric permittivity and low dielectric loss were prepared by incorporating the giant dielectric permittivity material Na0.5Bi0.5Cu3Ti4O12 (NBCTO) and conductive Ag nanoparticles in Poly(vinylidene fluoride) (PVDF) polymer matrix by melt mixing and hot pressing process, in which the filler content (volume fraction) of Ag nanoparticles and NBCTO powders was set at 50 vol% and PVDF was set at 50 vol%. The structure and thermal stability of the composites were characterized using X-ray diffraction (XRD) and thermo-gravimetric analysis (TGA). Studies on the dielectric properties of composites in the frequency range from 10 to 10(6) Hz showed that the Ag-NBCTO-PVDF composite exhibited high dielectric permittivity of 222.4 and low loss tangent of 0.32 at 1 kHz when the content of Ag was 5 vol%. A percolation threshold of f(Ag)=5.9 vol% was calculated through the percolation theory.

• 出版日期2016-12-15
• 单位苏州大学