Co_3O_4纳米棒的溶剂热合成及形成机理分析

Synthesis and Formation Mechanism of Co_3O_4 Nanorods by a Solvothermal Process

以Co(NO3) 2 ·6H2 O为主要原料 ,H2 O2 为氧化剂 ,在油酸和正十二烷烃的混合溶液中 ,利用溶剂热技术于 160℃反应 10h ,成功地合成了Co3O4 纳米棒 .用X射线粉末衍射 (XRD)、透射电子显微镜 (TEM)和振动样品磁强计 (VSM)等手段对产物进行了表征 ,并对产物的形成机理进行了初步分析 .结果表明 ,产物为立方型Co3O4 纯相 ,优化实验条件可得到棒状Co3O4 ,其平均尺寸约为 2 5× 10 0nm .Co3O4 纳米棒的形成与微乳液的棒状结构有关 ,棒状结构的胶束是形成这种纳米棒的模板 .在室温下 ,产物的矫顽力 (Hc)为 3 5 3Oe ,剩余磁化率 (Mr)为 0 .4emu/g .

Co 3O 4 nanorods have been synthesized at 160℃ for 10 h in the solution of oleic and n cetane by an emulsion solvothermal method using Co(NO 3) 2·6H 2O as starting materials. The as prepared product was characterized by X ray powder diffraction (XRD), transmission electron microscope (TEM), and vibrating sample magnetometer (VSM). The formation mechanism of the prepared product was analyzed based on formation of rod like micelles of oleic acid. Cobalt ions can migrate into the micelle core for the nucleation and growth of Co 3O 4. The results show that the as prepared Co 3O 4 nanorods are with the average size 25×100 nm and in the cubic phase. The magnetic susceptibility meets about linearly with the applied magnetic field at room temperature, and the coercivity ( Hc ) and remanent magnetization ( Ms ) values of the product at room temperature are 353 Oe and 0.4 emu/g, respectively. This simple route is also expanded to synthesize other materials with the rod like morphology.