Enhanced Dielectric Permittivity of Optimized Surface Modified of Barium Titanate Nanocomposites

Abstract

High permittivity polymer-ceramic nanocomposite dielectric films take advantage of the ease of flexibility in processing of polymers and the functionality of electroactive ceramic fillers. Hence, films like these may be applied to embedded energy storage devices for printed circuit electrical boards. However, the incompatibility of the hydrophilic ceramic filler and hydrophobic epoxy limit the filler concentration and therefore, dielectric permittivity of these materials. Traditionally, surfactants and core-shell processing of ceramic fillers are used to achieve electrostatic and steric stabilization for adequate ceramic particle distribution but, questions regarding these processes still remain. The purpose of this work is to understand the role of surfactant concentration ceramic particle surface morphology, and composite dielectric permittivity and conductivity. A comprehensive study of barium titanate-based epoxy nanocomposites was performed. Ethanol and 3-glycidyloxypropyltrimethoxysilan surface treatments were performed, where the best reduction in particle agglomeration, highest value of permittivity and the lowest value of loss were observed. The results demonstrate that optimization of coupling agent may lead to superior permittivity values and diminished losses that are ~2–3 times that of composites with non-optimized and traditional surfactant treatments.

Characterization of barium titanate reinforced acrylonitrile butadiene rubber composites for flexible electronic applications: influences of barium titanate content

“…The dissipation factor or tan ⊐ represents the ratio of dielectric loss with dielectric constant. 51 It is seen that at a frequency < 10 6 Hz, tan ⊐ of the NBR/BT composites was higher than that of NBR. However, peaks of tan ⊐ tend to decrease at frequencies > 10 6 Hz and shift towards lower frequency with increasing BT loading ( Fig.…”

“…This may be related to better interaction between BT and NBR. 51 Figure 8(c) shows the conductivities of NBR and NBR/BT composites. Conductivity increased with BT loading probably because of ion hopping in the matrix.…”

Polarization Parameters and Scaling Matter—How Processing Environment and Shape Factor Influence Electroactive Nanocomposite Characteristics

“…Integration of embedded passive components into printed circuit boards generally results in enhanced electrical performance of the device, improved reliability, reduction of device size, faster switching speed, and lower production costs [29][30][31][32]. Two-phase composites: metal-polymer [33][34][35][36][37] and ceramic-polymer have been extensively studied [38][39][40][41][42] for application in coupling or by-pass capacitor technology, where emphasis has been placed on achievement of high effective dielectric constants via analysis of percolation theory and mixing rules. Piezo-polymer composites are also promising because of their excellent tailored properties [3,30].…”

Effect of Hydrothermal Treatment and Doping on the Microstructural Features of Sol-Gel Derived BaTiO3 Nanoparticles

“…In the preparation of high-performance piezo-composites, one of the main issues is related to a generally poor compatibility between the ceramic nanoparticles (NPs) and the polymeric matrix, which does not allow a good dispersion of the filler, leading to a lower improvement of the piezoelectric performances. However, the surface functionalization of ceramic powders can improve the filler-matrix compatibility and enhance the dielectric and piezoelectric performance of the final product [ 19 , 20 , 21 , 22 ]. The yield of chemical modification depends on both the surface area and the surface reactivity of fillers, which can be improved through wet chemical syntheses of ceramic NPs.…”