| 초록 |
Development of new inorganic-organic hybrids with high value of dielectric constant has received much current interest for various electronic applications, such as embedded capacitors, multi-layer ceramic capacitors (MLCC), printed circuit boards (PCB), etc. But, it is very difficult to incorporate pre-crystalline ceramic powders (BaTiO3 in particular, which is known to exhibit very high value of dielectric constant) into the organic matrix due to very low dispersibility of the crystalline particles. Therefore, the synthesis of crystalline BaTiO3, highly dispersible in organic medium and then development of new organic-inorganic hybrids there from with high value of dielectric constant is the main focus of this work. Crystalline BaTiO3 (70-100 nm), highly dispersible in organic medium, was synthesized at ~70oC by the reaction between aqueous Ba(OH)2.H2O and acetylacetone or ethylene diamine modified Ti(OPri)4 precursor (Hacac/Ti molar ratio = 3.0) and they were fully characterized by XRD, FTIR, SEM, TEM. As-prepared crystalline particle showed high dispersibility in N-methyl-2-pyrrolidone (NMP) and the precursors for inorganic-organic hybrids were prepared by dissolving calculated amount of soluble polyimide into the BaTiO3 dispersion (solid content: 10-20 wt%, BaTiO3 content = 10-70 wt%). The precursors were deposited on glass substrates by spinning technique (2000 rpm, 20 s). Hybrid films were cured and also characterized by XRD, FTIR and SEM., and the measurement of dielectric properties. |
