Graphene 2018 Surface modified barium titanate for optimal dielectric properties in polymer-ceramic nanocomposite films

摘要

High permittivity polymer-ceramicnanocomposite dielectric films leverage theease of flexibility and processing ofpolymers and functional properties ofceramic fillers. Thus, they could be appliedto advanced embedded energy storagedevices for printed wired electrical boards.The incompatibility of the two constituentmaterials, hydrophilic ceramic filler andhydrophobic epoxy limits the fillerconcentration and therefore, dielectricproperties of these materials. Use ofsurfactants and core-shell processing ofcomposite fillers is traditionally used toachieve electrostatic and steric stabilizationfor adequate ceramic particle distribution.This work aims to understand the role ofsurfactant concentration in establishingmeaningful interfacial layers between theepoxy and ceramic filler particles byobserving particle surface morphology,dielectric permittivity and device dissipationfactors. A comprehensive study ofnanocomposites that were comprised of non-treated and surface treated barium titanate(BT) embedded within an epoxy matrix wasperformed. The surface treatments wereperformed with ethanol and 3-glycidyloxypropyltrimethoxysilan, wherethe best distribution, highest value ofpermittivity (~48.03) and the lowest value ofloss (~0.136) were observed for the samplesthat were fabricated using 0.5 volumefraction of BaTiO3 and 0.02 volume fractionof silane coupling agent.