磁场辅助下磁性钴纳米线的制备工艺  

Preparation technology of magnetic cobalt nanowires under an external magnetic field

作　　者：孙莉娟 廖立[1] 李小雨 徐志强 谢克难[1] 

机构地区：[1]四川大学化学工程学院,成都610065

出　　处：《功能材料》2017年第11期11182-11186,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50904046)

摘　　要：在外加磁场作用下,以水为溶剂,使用氯铂酸为成核剂,聚乙烯吡咯烷酮(PVP)为表面活性剂,采用无模板液相还原法制备得到钴纳米线,并探究了不同温度和pH值以及磁场对其形貌的影响,利用扫描电镜(SEM)、X射线衍射(XRD)、能谱(EDS)和振动样品磁强计(VSM)对其进行表征。SEM结果表明,在磁场辅助下80℃、pH值为14和磁感应强度为40 mT时制备得到的钴纳米线线性较好,表面光滑,直径较小且均匀(约为100nm)。XRD和EDS结果表明钴纳米线纯度较高。在室温下,制备得到的钴纳米线具有铁磁性,其饱和磁感应强度和矫顽力分别为112.00A·m^2/kg和2.8×10~4 A/m。Cobalt nanowires were prepared by liquid phase reduction method with template-free in aqueous solution under an external magnetic field,during which chloroplatinic acid was used to act as the nucleating agent and polyvinylpyrrolidone（PVP）was used to serve as the surfactant.The effect of different temperature,pH value and magnetic field on the morphology of cobalt nanowires was investigated.The resultant cobalt nanowires were characterized by field emission scanning electron microscope（SEM）,X-ray diffraction（XRD）,energy dispersive spectrometer（EDS）and vibrating sample magnetometer（VSM）.The SEM images showed that the prepared cobalt nanowires under 80 ℃,a pH of 14 and the magnetic induction intensity of 40 mT possessed a uniform linear morphology and smooth surface.The average diameter of the synthesized cobalt nanowires was about 100 nm.XRD and EDS patterns indicated that the prepared products were cobalt nanowires.The hysteresis loop suggested that the synthesized cobalt nanowires were ferromagnetic at room temperature.The saturation magnetization（Ms）and the coercivity（Hc）of the cobalt nanowires were 112.00 A·m^2/kg and 2.8×10~4 A/m,respectively.

关 键 词：钴纳米线 水体系 液相还原法 外加磁场 

分 类 号：TB332[一般工业技术—材料科学与工程]