Since dielectric elastomers (DEs) can undergo muscle-like actuation under external electric fields, they show promising applications in fields such as actuators, generators, and biomimetic robots. However, traditional DEs require strong electric fields and pre-stretching to deliver useful deformation, limiting their practical applications. Herein, a novel method for preparing polydimethylsiloxane (PDMS) composites with high actuation under low electric field without pre-stretching is reported. In this method, polydopamine (PDA) is used to modify sandwich-structured silicon dioxide@graphite oxide hybrids (PDA@SiO₂@GO). The inclusion of the SiO₂ layer improves the dielectric constant and reduces the dielectric loss of the composite, while the PDA shell improves the dispersibility of the filler. The PDA@SiO₂@rGO/PDMS composite containing 5 wt% PDA@SiO₂@GO exhibits a large actuated strain of 14.23% under an electric field of 33.19 kV/mm without pre-stretching; this value is 465% larger than that of pure PDMS and superior to those of most reported DEs composites. The results provide a promising new route to prepare high-performance DEs.

由于介电弹性体（DE）可以在外部电场下进行类似肌肉的致动，因此它们在致动器，发电机和仿生机器人等领域具有广阔的应用前景。但是，传统的DE需要强电场和预拉伸才能产生有用的变形，从而限制了其实际应用。在此，报道了一种在不施加预拉伸的情况下在低电场下高致动性地制备聚二甲基硅氧烷（PDMS）复合材料的新颖方法。在这种方法中，聚多巴胺（PDA）用于修饰夹心结构的二氧化硅@氧化石墨杂化物（PDA @ SiO ₂ @GO）。SiO ₂的夹杂物层提高了介电常数并降低了复合材料的介电损耗，而PDA壳提高了填料的分散性。在PDA @的SiO ₂ @ RGO / PDMS含有5％（重量）@ PDA的SiO复合₂ @GO表现出大的致动的14.23％的33.19千伏/毫米的电场下菌株而没有预拉伸; 该值比纯PDMS大465％，并且优于大多数报道的DEs复合材料。结果为制备高性能DE提供了一条有希望的新途径。