溶剂热法制备钴微球及其表征

Cobalt Microspheres: Preparation by Solvothermal Method and Characterization

0引言 过渡金属钴以及它的一些氧化物,以其特殊的电、磁和光学性能被广泛应用到信息存储[1]、催化剂[2]、磁光材料[3]、铁磁流体[4]以及生物医学[5]等诸多领域。前人曾经用羰酰钴热解法[6-7]、γ射线照射法[8]、光刻气相沉积法[9]、电化学沉积法[10]和金属盐溶液的液相还原法等方法合成出诸多新颖形貌的钴纳米材料，

High purity and uniform sized cobalt microspheres were prepared via solvothermal method by using acetate cobalt as and ethanol as raw materials through one step reaction under 250 ℃ . The samples were characterized by XRD, SEM and magnetic measurements. The effects of time and temperature on products were studied. The extension of the reaction time has no effect on the crystal, but only some tiny changes on the morphology of cobalt spheres and with the increasing of temperature, the cobalt crystal transforms from hcp-Co to fcc-Co. The cocercivity of the cobalt material obtained is up to 230 Oe which is higher than that of the available cobalt magnetic materials. In addition, this method has advantages such as relatively lower synthesis temperature, easier operation, shorter reaction time and lower power consumption.