In this work, strontium titanate (STO) was coated on the surface of carbon nanotubes (MWCNTs) through a sol–gel method to form a core–shell structure hybrid powder (STO@MWCNTs). This powder was then added to polydimethylsiloxane to prepare a flexible high-K composite. As coating, STO effectively prevents the overlap and agglomeration of MWCNTs, thereby passivating the percolation threshold of the composite. STO increases the dielectric properties of the composite as a high dielectric ceramic. Under a low filler loading amount of 11 wt%, the dielectric constant and dielectric loss of the composite are 53 and 0.1, respectively. In addition, the composite can still maintain superior breakdown strength and mechanical properties, given the relatively low filler concentration. The enhanced dielectric properties, breakdown strength, and tensile strength make the composite suitable for application as dielectric material in flexible and stretchable energy storage equipment.

中文翻译：

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通过涂覆SrTiO3层提高聚合物/碳纳米管复合材料的介电性能和击穿强度

在这项工作中，钛酸锶（STO）通过溶胶-凝胶法涂覆在碳纳米管（MWCNT）的表面上，形成核-壳结构混合粉末（STO @ MWCNTs）。然后将该粉末添加到聚二甲基硅氧烷中以制备柔性的高K复合材料。作为涂层，STO有效地防止了MWCNT的重叠和附聚，从而钝化了复合材料的渗透阈值。STO提高了复合材料作为高介电陶瓷的介电性能。在11wt％的低填料负载量下，复合材料的介电常数和介电损耗分别为53和0.1。此外，考虑到相对较低的填料浓度，复合材料仍可以保持出色的击穿强度和机械性能。增强的介电性能，击穿强度，