All-organic room temperature thermally switchable dielectric system
Room temperature switchable dielectric materials have great potential in applications such as smart sensor, energy storage and circuit protection. In this paper, a novel switchable dielectric system is designed based on a “three-layer” model. And an all-organic dielectric switch is built up by packaging a Span80/hexadecane (Span80/HD) mixture with a polyethylene terephthalate (PET) film. The Span80/HD-PET film system (SHPS) shows obvious dielectric switching properties during the solid-liquid phase transition of Span80/HD mixture. The dielectric switch can be triggered at 13.7 ˚C and shows good cycling stability. By changing the thickness of the PET film, the highest switching ratio can be 270.5. Besides, the switching temperature can be adjusted by changing the components of organic mixture.