Investigation of Flexible Dielectric Composites Based on Three-dimensional Barium Titanate/Polyvinyl Alcohol-Boron Nitride Constructed by Template Method
Three-dimensional barium titanate(3DBT)ceramic network was prepared by sol-gel method using cleanroom wipers as template.Different contents of boron nitride(BN)nanosheets/polyvinyl alcohol(PVA-BN)solution were re-versely introduced into the 3DBT network,resulting in flexible 3DBT/PVA-BN composite dielectric film.The study shows that PVA solution can be effectively embedded into 3DBT framework via reverse infiltration,endowing the materi-al with excellent flexibility.The mass fraction of 3DBT in a saturated 3DBT/PVA-BN composite is about 27% (volume fraction 6.9% ).What's more,the 3DBT/PVA-0.50% BN system exhibits comprehensive dielectric and energy storage per-formances.The dielectric constant and energy storage density of 3DBT/PVA-0.50% BN composites are 18.1(at 1 kHz)of 1.24 J/cm3(at 90 kV/mm),being 1.74 and 3.54 times higher than those of traditional 27% nano-BT/PVA composite,re-spectively.In addition,the obtained 3DBT/PVA-BN dielectric film possesses better thermal stability,implying good application prospects.
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