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High dielectric thin films based on barium titanate and cellulose nanofibrils

机译：基于钛酸钡和纤维素纳米纤维的高介电薄膜

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A series of composite films based on tetragonal barium titanate (BTO) and cellulose nanofibrils (CNF) with high dielectric constant are prepared using a casting method in aqueous solution. No organic solvent is involved during the preparation, which demonstrates the environmental friendliness of the novel material. With less than 30 wt% of filler loading, the excellent distribution of BTO nanoparticles within the CNF matrix is revealed by the FE-SEM images. The dielectric constant of the CNF/BTO (30 wt%) composite film reaches up to 188.03, which is about seven times higher than that of pure CNF (25.24), while the loss tangent only rises slightly from 0.70 to 1.21 (at 1 kHz). The thin films kept their dielectric properties on an acceptable level after repeatedly twisting or rolling 10 times. The improvement of thermal stability is observed with the presence of BTO. The outstanding dielectric properties of the CNF/BTO composite film indicates its great potential to be utilized in energy storage applications.
机译：使用浇铸方法在水溶液中制备基于四方钛酸钡（BTO）和纤维素纳米纤维（CNF）的一系列复合薄膜和具有高介电常数的纤维素纳米纤维。在制备过程中没有有机溶剂，这表明了新材料的环境友好性。小于30wt％的填料加载，Fe-SEM图像揭示了CNF基质内的BTO纳米颗粒的优异分布。 CNF / BTO（30wt％）复合膜的介电常数高达188.03，比纯CNF（25.24）高约7倍，而损耗切线仅略微升高0.70至1.21（1 kHz ）。在重复扭转或滚动10次之后，薄膜在可接受的水平上保持其介电性能。通过BTO的存在观察到热稳定性的提高。 CNF / BTO复合膜的突出介电性能表示其在储能应用中使用的巨大潜力。

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