微乳液-共沉淀-煅烧法制备不同形貌的钛酸钡纳米粒子(英文)

PREPARATION OF BARIUM TITANATE NANOPARTICLES WITH DIFFERENT MORPHOLOGIES BY THE MICROEMULSION-COPRECIPITATION-CALCINATION METHOD

以Ti(OC4H9)4,H2C2O4·2H2O和BaCl2·2H2O为原料,在水溶液/辛基酚聚氧乙烯(9)醚/正己醇/环己烷反相微乳液体系中制得了前驱体BaTiO(C2O4)2·4H2O。在700℃煅烧前驱体BaTiO(C2O4)2·4H2O4h分别制得直径约为40～80nm的BaTiO3球形纳米粒子和长约180～300nm、直径为50～80nm的BaTiO3纳米棒。用X射线衍射、透射电镜、选区电子衍射、Fourier红外光谱分析和热重分析表征了所制备的BaTiO3纳米粒子的结构和性能。结果表明:所制备的BaTiO3纳米粒子大小均匀,属立方相,具有单晶结构。改变水与表面活性剂的摩尔比能控制BaTiO3纳米粒子的大小和形貌。

A precursor, BaTiO（C204）2·4H2O, was synthesized in reverse microemulsion consisting of water, t-octylphenoxypolye- thoxyethanol, n-hexanol and cyclohexane, using Ti（OC4H9）4, H2C2O4·2H2O and BaCl2·2H2O as starting materials. Barium titanate（BaTiO3） spherical nanoparticles with diameters of 40-80 nm and BaTiO3 rod-like nanoparticles with diameters of 50-80 nm and lengths of 180-300 nm were fabricated by calcining the precursors at 700 ℃ for 4 h and were characterized by X-ray diffraction, transmission electron microscope, selected area electronic diffraction, Fourier transform infrared spectroscopy, and thermogravimetry. The results show that the as-prepared BaTiO3 nanoparticles with uniform sizes and a single crystal structure belong to a cubic crystal system. The sizes and morphologies of BaTiO3 nanoparticles can be controlled by changing the molar ratio of water to surfactant.