Preparation of BaTiO_3/PMMA dielectric Films by Screen Printing

摘要

The high-k composite dielectric ink is prepared by dispersing the surface modified BaTiO_3 in PMMA solution. The high quality BaTiO_3-PMMA composite films are screen printed on ITO glasses. BaTiO_3 nanoparticles are surface modified with a silane coupling agent (MPTMS) to improve their affinity for PMMA matrix. The dielectric constant, loss tangent, specific capacitance and transmittance of BaTiO_3/PMMA nanocomposites are investigated as the function of volume fraction of BaTiO_3. These composites, which possess both high dielectric constant and low dissipation factors and can be screen printed at ambient temperature and pressures, have very wide practical applications.