Greatly enhanced dielectric permittivity in poly(vinylidene fluoride)-based polymeric composites induced by Na1/3Ca1/3Bi1/3Cu3Ti4O12 nanoparticles

Abstract

Greatly enhanced dielectric permittivity (e 0 ) in poly(vinylidene fluoride) (PVDF) polymeric composites was induced by incorporating Na 1/3 Ca 1/3 Bi 1/3 Cu 3 Ti 4 O 12 (NCB) nanoparticles. The NCB/PVDF composites were fabricated by conventional mixed powders and hot pressing. Nanosized (NCB-NPs) and microsized-powders (NCB-MPs) prepared, respectively, by chemical combustion and solid state reaction methods were used as fillers. The dispersion of NCB-NPs was quite good in the PVDF matric. A greatly improved e 0 of PVDF-based polymeric composites can be induced by filling with NCB-NPs compared to that of the NCB-MPs/PVDF composite. Interestingly, at 10 3 Hz, the nanocomposite with 50 vol% of NCB-NPs can exhibit good dielectric properties with high e 0 of about 210.8 and low loss tangent (tand & 0.83). This enhanced e 0 value is much larger than that of PVDF polymer by a factor of &20. The increase in e 0 in the nanocomposites is attributed to large interfacial areas and very short interparticle distance. These can cause a great increase in the interfacial polarization intensity.

Significantly improved dielectric properties of multiwall carbon nanotube-BaTiO3/PVDF polymer composites by tuning the particle size of the ceramic filler

“…8 Notably, the CNT-mBT/PVDF composites used only a small amount of llers (i.e., CNT and mBT) with the total volume fraction of z0. 22. A list of the dielectric properties of the CNT-BT/PVDF composites with different size of BT and volume fractions are summarized in Table 1.…”

“…[14][15][16][17][18][19][20][21] An easy approach for enhancing the dielectric permittivity of polymer composites is to incorporate polymer matrix with highpermittivity oxide particles. Many high-permittivity oxide particles (e.g., CaCu 3 Ti 4 O 12 and related oxides, 16,18,20,22 BaTiO 3 , 14,17,19 and FeTiNbO 6 23 have been widely selected as llers. Unfortunately, a signicantly enhanced dielectric permittivity (3 0 > 50) can oen be obtained by using very large loading of these llers (f ller $ 50 vol%).…”

Greatly enhanced dielectric permittivity in La1.7Sr0.3NiO4/poly(vinylidene fluoride) nanocomposites that retained a low loss tangent

“…1,10 One of the most common and promising strategies to increase the 3 0 value of PVDF is to incorporate ceramic oxide particles that exhibit a large 3 0 > 10 3 . [2][3][4][11][12][13][14][15][16] This capitalizes upon the idea that a combination of a very large 3 0 value of inorganic ceramic particles coupled with excellent exibility and good dielectric strength of polymers 1,11,12 can be used to produce suitable polymeric dielectric materials. From the point of view of capacitor applications, although signicant efforts have been made to increase the 3 0 of ferroelectric-ceramic/polymer composites, their 3 0 values are difficult to signicantly enhance to more than 100 even though the ller contents as high as 50 vol% (or f ller ¼ 0.5) were used.…”

“…This can cause a mechanical resonance in the device during charging and discharging, resulting in a reliability limit of the device. 11 Non-ferroelectric ceramics that can exhibit very high 3 0 values of z10 4 12,13,15,19 (Li + Ti) co-doped NiO (LTNO) particles, 2 and Ba(Fe 0.5 Nb 0.5 )O 3 (ref. 4) are considered promising llers for greatly enhancing the 3 0 value of PVDF polymers.…”

“…were prepared using a liquid-phase assisted dispersion method. 1,15,17 First, the prepared LSNO-NPs and purchased PVDF (Sigma-Aldrich) were mixed by ball-milling in absolute ethanol for 5 h using ZrO 2 balls. Second, the mixture was further dried to evaporate the absolute ethanol.…”