Abstract
High-k polymer-based nanocomposite is an emerging field that is extensively studied in electronic devices. One of the main challenges in pursuing high permittivity is to reduce the dielectric loss in order to meet various practical applications. In this work, space charge regulated polymer nanocomposite with a novel sandwich structure is reported. In the proposed sandwich structure, the internal layer is a highly insulating BaTiO3@SiO2 (BT@SO)/PVDF nanocomposite film, and the outer layers are the graphite nanosheet (GR)/PVDF composite films. The structure of the sandwich film is carefully revealed. Under the applied electrical field, the sandwich-structured composites possess a high permittivity of 136 and ultralow loss of 0.028 (10 kHz). Consistently, computational study confirms the improved space charge accumulation in the GR/PVDF layer and reveals the mechanism for the high dielectric constant. Both the experimental and computational results demonstrate the significant role of the novel sandwich structure in designing the high-k polymer nanocomposites. This study provides an effective way for the design of high-k materials.
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