溶剂热法合成纳米级CoO粉体及其生长习性

Solvothermal Synthesis and Growth Mechanism of CoO Nanoparticles

以四水醋酸钴和无水乙醇为原料,采用溶剂热法在150℃制备了纳米晶体CoO.利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等手段对产物进行了分析和表征.结果表明,产物CoO晶体为面心立方结构,晶粒尺寸约为50nm,大小均匀,分散性好.研究了不同合成条件对CoO晶粒尺寸的影响,并分析了CoO的结晶习性,在低过饱和度条件下,CoO晶体因{111}晶面生长速度最慢而显露,因此它的形貌为八面体.

CoO nanoparticles have been synthesized by solvothermal method at 150 ℃, using Co（CH3COO）2.4H2O and CH3CH2OH as reactants. X-ray diffraction, scanning electron microscopy and transmission electron microscopy were employed to characterize the morphology and the crystalline structure of the CoO nanoparticles. It is revealed that the CoO nanoparticles are in face-centered cubic structure and have an average particle size of about 50 nm. The influences of the concentration of Co（CH3COO）E.4H2O and the reaction time on the particle size of the products have been studied. The growth habit of CoO nanoparticles is also discussed. These CoO nanoparticles are of octahedron configurations, as the { 111 } planes of CoO crystal grow at the slowest rate, under low super-saturated conditions.