In this work, pure barium titanate (BT) and cobalt doped barium titanate (CBT) were synthesized by using barium chloride, tetrabutyl titanate, cobalt chloride, and titanium chloride as precursors via a two‐step hydrothermal process. These precursor mixtures were further blended with a dispersion of surfactant + graphene nanoplatelets (GNP) judiciously during the second step of hydrothermal process to obtain their respective BT‐GNP and CBT‐GNP nanocomposites. The morphological and crystal structures of BT, CBT, BT‐GNP, and CBT‐GNP samples were analyzed by the powder XRD, and FESEM revealed that the formations of 10‐ to 30‐nm‐sized cubic phase BT, CBT nanoparticles with least amount of agglomerations, and more spherically shaped particles in the CBT, whereas their nanocomposite morphologies and compositional elemental mapping showed random distributions of BT and CBT particles over the GNP. The FT‐IR analysis indicated the presence of strong chemical interactions between the nanoparticles and GNP sheets in both the BT‐GNP and CBT‐GNP nanocomposites. Furthermore, the dielectric measurements carried out on the BT, CBT, BT‐GNP, and CBT‐GNP samples showed tremendous influences of metal doping and GNP on the BT which can support to tune its dielectric properties for several storage applications.

中文翻译：

---

水热合成，钛酸钡，钴掺杂钛酸钡及其石墨烯纳米片复合材料的介电性能

在这项工作中，通过两步水热法，以氯化钡，钛酸四丁酯，氯化钴和氯化钛为前体，合成了纯钛酸钡（BT）和钴掺杂的钛酸钡（CBT）。在水热过程的第二步中，明智地将这些前体混合物与表面活性剂+石墨烯纳米片（GNP）的分散体混合，以获得各自的BT-GNP和CBT-GNP纳米复合材料。X射线粉末分析了BT，CBT，BT-GNP和CBT-GNP样品的形态和晶体结构，FESEM显示形成的10至30 nm大小的立方相BT，CBT纳米颗粒的数量最少CBT中的团聚和更多球形的颗粒，而它们的纳米复合物形态和组成元素图谱表明BT和CBT颗粒在GNP上随机分布。FT-IR分析表明，在BT-GNP和CBT-GNP纳米复合材料中，纳米颗粒和GNP片之间存在强化学相互作用。此外，在BT，CBT，BT-GNP和CBT-GNP样品上进行的介电测量显示，金属掺杂和GNP对BT产生了巨大影响，可以支持对其多种存储应用的介电性能进行调整。