Preparation and Characterization of a Novel Polyimide/Surface Modified BaTiO<SUB>3</SUB> Nanocomposite for Solution Processable High k Dielectric
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The development of high performance flexible electronics requires dielectrics possessing a high dielectric constant and enhanced mechanical stability. We report on a novel polymer nanocomposite dielectric based on 3-glycidoxypropyltrimethoxysilane (GPTES) functionalized barium titanate (BaTiO3) nanoparticle as a dopant in crosslinkable polyimide (PI). Polyimide (DOCDA-6FHAB) was synthesized using the monomers, DOCDA and 6FHAB. And then, we introduced the BaTiO3 nanoparticle to make a high dielectric constant polyimide nanocomposite dielectric. Surface of BaTiO3 was modified GPTES to increase the interfacial adhesion. Crosslinked poly(4-vinylphenol) (PVP) used capping layer on polyimide nanocomposite layer. Polyimide nanocomposite bilayer film showed high diele ctric constant (5.58) and low leakage current density (10-7A/cm2) in metal-insulator-metal (MIM) devices. Detailed synthetic routes of polyimide and nanocomposite film fabrication condition will be presented.