溶剂热法制备超细钴粉及其机理研究  

Preparation and mechanism of ultrafine Co particles by solvothermal method

作　　者：步绍静[1] 李丹[1] 李世泰[1] 韩续豪 孙继兵[1] 崔春翔[1] 

机构地区：[1]河北工业大学材料科学与工程学院,河北省新型功能材料重点实验室,天津300130

出　　处：《功能材料》2017年第1期1148-1152,1158,共6页Journal of Functional Materials

基　　金：国家自然科学基金面上资助项目(51271072);国家自然科学青年基金资助项目(51301056);河北省自然科学基金资助项目(E2015202008);河北省自然科学青年基金资助项目(E2013202030)

摘　　要：以CoCl_2·6H_2O为原料、水合肼N2H_4·H_2O为还原剂,引入AgNO_3·6H_2O作为形核剂,采用乙二醇溶剂热法制备了超细钴粉。通过红外光谱分析探讨了零价Co形成的化学机理,对产物颗粒的相结构、微观形貌和磁性能进行了表征,重点考察了形核剂的加入量及溶剂热温度对钴粉微观结构和磁性能的影响。结果表明,当前驱体溶液中n(Ag^+)∶n(Co^(2+))=1∶100、溶剂热温度为160℃时,可以制得粒径在100nm以下的球状Co颗粒,Co粉分散性良好,且呈现出优异的软磁性能。In this paper, ultrafine Co particles were prepared by the solvothermal method, using COCl2 · 6H2O as the raw material and N2H4 ·H2O as the reductant. In addition, AgNO3 · 6H2O was introduced into the system as the nucleating agent. Chemical mechanism for the formation of zero-valent Co was discussed with the aid of Fourier transform infrared spectrometry （FT-IR）. Furthermore, phase structure, rnicromorphology and magnetic properties of the product particles were characterized. The influences of the nucleating agent addition and the solvothermal reaction temperature on the microstructure and magnetic performances were mainly investigated. The results show that spherical Co particles smaller than 100 nm can be achieved at 160 ℃ from the precursor solution in which the molar ration of Ag＋ to Co2＋ is 1 ： 100. The obtained Co particles exhibit good dispersibility and soft magnetic properties.

关 键 词：磁性材料 纳米颗粒 溶剂热法 微观结构 磁性能 

分 类 号：TB31[一般工业技术—材料科学与工程] TB34