High dielectric constant is highly desirable in capacitors and memory devices. In this work, oleic acid (OA)‐capped BaTiO₃ nanocrystals were synthesized by a two‐phase approach. Polyimide (PI)/BaTiO₃‐nanocrystal composite thin films with high dielectric constant have been successfully fabricated. The morphologies and dielectric properties of the hybrid films were exploited. The results showed that BaTiO₃ nanocrystals can be uniformly dispersed in the PI thin films owing to the surface modification of OA‐capped BaTiO₃ nanocrystals. It was found that the dielectric constant of composite film varies with the volume fraction of BaTiO₃ nanocrystals and sintering temperatures and reaches a maximum value of 44.1, which is around 13 times higher than that of pristine PI thin film (3.2). These results demonstrated that PI/BaTiO₃‐nanocrystal composite films have considerable application potential in microelectronic fields.

中文翻译：

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聚酰亚胺/ BaTiO3-纳米杂化薄膜的制备及其介电性能

在电容器和存储设备中非常需要高介电常数。在这项工作中，通过两阶段方法合成了油酸（OA）封端的BaTiO ₃纳米晶体。具有高介电常数的聚酰亚胺（PI）/ BaTiO _3-纳米晶体复合薄膜已经成功制备。研究了杂化膜的形貌和介电性能。结果表明，由于OA包覆的BaTiO ₃纳米晶体的表面改性，BaTiO ₃纳米晶体可以均匀地分散在PI薄膜中。发现复合膜的介电常数随BaTiO ₃的体积分数而变化纳米晶体和烧结温度，其最大值达到44.1，约为原始PI薄膜（3.2）的13倍左右。这些结果表明PI / BaTiO _3-纳米晶体复合膜在微电子领域具有相当大的应用潜力。