Preparation and Dielectric Properties of the Three-phase Composites of Graphite Oxide/Barium Titanate/Epoxy Resin

Polymer-based dielectric composites have important applications in the fields of power engineering, mi- croelectronics and high-density packaging. In this study, graphite oxide was prepared through oxidizing nature graph- ite flakes with concentrated sulfuric acid and potassium permanganate. And graphite oxide/barium titanate/epoxy resin (GO/BT/ER) three-phase composites were prepared. Dielectric performance of the composites with varied GO loading amounts was investigated. The experimental results showed that the GO/BT/ER composites with low GO loading amount exhibited higher dielectric constant than that of BT/ER and the dielectric loss remained low. The dielectric constant of 3wt%GO/BT/ER composite was 42.6 and the dielectric loss was 0.043 (20℃, 1 kHz), while the dielectric constant of the BT/ER composites was 17.7. Therefore, the GO/BT/ER composites are promising candidates for the embedded dielectrics. Furthermore, the mechanism of graphite oxide on the dielectric properties of the composites also explored.