Fabrication of high concentration barium titanate/polyvinylpyrrolidone nano-composite thin films and their dielectric properties

A simple method for fabricating polyvinylpyrrolidone (PVP) thin films containing barium titanate (BT) nanoparticles on electrodes is proposed. The BT particles that had an average size of ca. 8 nm and a tetragonal crystalline phase were prepared with complex alkoxide methods in the presence of PVP. PVP/ ethanol/water solutions containing the BT particles, which were suspended with sonication for 0-12 h, and were spin-coated on ITO glass substrates. Surface roughness was low at a sonication time longer than 4 h. As a BT concentration for the film increased from 0 to 85 wt%, its dielectric constant increased from 7 to 30 with dissipation factors below 0.12. The present method can be used to prepare high capacitance films at low temperatures, which have favorable electrical properties or characteristics. (C) 2008 Elsevier B.V. All rights reserved.