NiTiO3纳米棒的制备及表征

结合溶胶-凝胶法和微乳液化学剪裁技术,以钛酸丁酯和N iC l2制备凝胶,在SDS/正丁醇/正庚烷/水形成的微乳液体系中,对凝胶进行化学剪裁并与KBH4反应,经500℃煅烧30 m in,制备出直径40~100 nm,长度150~700 nm,长径比为4~7的N iTiO3纳米棒。用XRD、ED、EDS、IR、TEM、TGA和DSC等方法对产物的组成、结构及纳米棒的形成过程进行了研究。实验表明,凝胶的陈化时间、煅烧温度和煅烧时间对纳米N iTiO3的组成、粒径和形貌均有影响。研究认为,前驱物不均匀地吸附有机物,导致煅烧过程中,颗粒在不同方向上以不同的速度生长,是N iTiO3纳米棒形成的原因。

Preparation and Characterization of NiTiO3 Nanorods

Combining sol-gel method with microemulsion chemical tailoring technique,the gel prepared by nickel chloride and Ti(OC_4H_9)_4 was tailored and reacted with KBH_4 in quaternary sodium dodecyl sulfate(SDS)/n-butanol/n-heptane/water microemulsion,and then calcined at 500 ℃ for 30 min.Nickel titanate(NiTiO_3) nanorods with diameters of 40~100 nm,lengths of 150~700 nm and the ratios of length to diameter of 4~7 were prepared.The composition,structure and formation procedure of the nanorods were characterized by XRD,ED,EDS,IR,TEM,TGA and DSC.The results indicate that the composition,particle size of NiTiO_3 crystallite and morphology were influenced by aging time of the gel,calcination temperature and calcination time.The results imply that the asymmetric absorption of organic compound on the precursor particle surface leads to the precursor spherical particles growing in different direction at different speed and forms NiTiO_3 nanorods through out in calcination process.