碳包裹纳米铁粒子的制备及其磁性研究  

Preparation and magnetism study of carbon-coated nano iron particles

作　　者：赵军[1] 李煜[1] 肖乐勤[1] 徐复铭[1] 周伟良[1] 

机构地区：[1]南京理工大学化工学院,南京210094

出　　处：《材料科学与工艺》2008年第6期801-805,共5页Materials Science and Technology

摘　　要：以离子交换树脂(D113)为碳源,与二价铁离子交换后形成含金属的前驱体(Fe/D113),经400～700℃热解制备了碳包裹纳米铁粒子.用XRD、HRTEM等技术对热解产物的形貌和结构进行了分析表征,初步分析了其形成机理并用VSM研究了热解产物的磁性能.结果表明:Fe/D113的热稳定性要强于D113;400～700℃的热解产物中铁的晶体结构与热解温度有关,且热解产物中的纳米铁粒子的粒径随热解温度的升高而增大.磁性能研究表明,400℃热解产物具有超顺磁特性,500～700℃热解产物的矫顽力Hc均远大于相应的块体铁,并与产物中纳米铁粒子的尺寸有关;所有热解产物比饱和磁化强度Ms小于相应的块体材料,并随其中纳米铁粒子尺寸的增大而增加.Carbon-coated nano-Fe particles were prepared by pyrolysis of Fe-exchanged cation exchange resin （Fe/Dll3） at 400 -700 ℃. The structure and morphologies of the carbon-encapsulated nano iron particles were investigated by XRD and HRTEM. The formation mechanism was discussed and the magnetic property was studied by VSM as well. Results showed that the thermal stability of Fe/DI13 was better than that of pure Dl13 resin. The crystal structure of pyrolyzates obtained at 400 -700 ℃ was different and the particle size of nano iron increased with the increase of pyrolytic temperature Magnetic property tests showed that the pyrolyzate obtained at 400 ℃ was superparamagnetic. The coercivity（ Hc ） of pyrolyzates obtained at 500 -700 ℃ was much higher than that of the corresponding bulk iron, and the value of H c was influenced by the size of nano iron particles. The saturation magnetization （ Ms ） of all the pyrolyzates was lower than that of bulk iron and increased with the increase of pyrolytic temperature.

关 键 词：复合材料 碳包裹纳米粒子 磁性能 

分 类 号：TB333[一般工业技术—材料科学与工程] TB383