Papers by Keyword: Alkoxide

Abstract: BaTiO₃ films were fabricated on Si substrate using inkjet printing technique. To achieve low-temperature fabrication of BaTiO₃ films, Ba-Ti-alkoxide ink was prepared. The mixing ratio and sequence of raw materials were optimized for controlling the chemical stability and viscosity of alkoxide ink. The inkjet printing films on Si substrate were annealed at 700 °C, and it resulted in the formation of BaTiO₃. It was found that the film quality was improved by adding BaTiO₃ nanoparticles into the Ba-Ti-alkoxide ink.

Abstract: Nanosized α-aluminum oxides have been prepared by hydrolysis of aluminum alkoxides using a sol-gel procedure. The Na(AOT) as a surface active agent was added into the alumina precursor solution to investigate the influence on size and morphology of alumina particles. The product phase was mainly boehmite with mean particle size of 20~30 nm. The crystal phases and morphology of the alumina nanoparticles were analyzed by X-ray diffractometry and by transmission electron microscopy, respectively. The TEM observations revealed that α-Al2O3 with about 80 nm spherical and hexagonal shapes was formed after calcination at 1200oC. The TG/DSC analyses were also done to determine the phase changes of alumina precursors from room temperature to 1200oC.

Abstract: By the usage of the hydrolysis of Ti alkoxide, various types of TiO2 were obtained through the addition of catalyst (HCl, NH4OH, and CH3COONH4) and some additives into Ti alkoxide solution at room temperature. In special, the effect of two additives, diethylene glycol (DEG) and hexamethylphospheric triamide (HMPA), on hydrolysis behaviors and microstructure with various catalyst for hydrolysis of Ti-tetraisopropoxide was in detail investigated. In case of TiO2 powder with HMPA as an additive, the crystallinity of TiO2 except with NH4OH as a catalyst decreased in XRD patterns, compared to those of products with no additive and with DEG as an additive. The addition of HMPA prohibited the growth of TiO2 and led to fine TiO2 with the average particle size of approximately 10nm.