水热法合成CoFe2O4纳米颗粒及其磁性能
CoFe2O4 Nanoparticles Synthesized by Hydro-Thermal Method and Its Magnetic Properties
摘 要
采用水热法制备尖晶石CoFe2O4纳米颗粒, 通过改变合成温度(140～200 ℃)和原料中钴的含量, 借助X射线衍射仪、场发射扫描电子显微镜、透射电镜和振动磁强计等研究上述两个因素对合成颗粒结构、形貌及磁性能的影响, 并从机制上加以解释。结果表明: 水热法合成的CoFe2O4纳米颗粒平均粒径在30~40 nm之间, 提高原料中钴的含量有利于去除α-Fe2O3相; 随合成温度的升高, 该颗粒的饱和磁化强度持续增大, 最高为59.694 Am2·kg-1, 矫顽力先升后降, 最高可达1 273.28 A·m-1。
钴铁氧体
纳米颗粒
饱和磁化强度
矫顽力
hydro-thermal method
Co ferrite
nanoparticle
saturation magnetization
coercive force
Abstract
Spinel CoFe2O4 nanoparticles were synthesized by hydro-thermal method. The effects of synthetic temperature and Co contents in raw materials on the structure, morphology and magnetic properties of synthetic particles were studied by X-ray diffractometer, field emission scanning electron microscopy, transmission electron microscopy and vibration magnetometer, changing synthetic temperature (140-220 ℃) and Co contents in raw materials, and the effects were explained in mechanism. The results show that the average grain size of CoFe2O4 nanoparticles synthesized by hydro-thermal method was between 30 nm and 40 nm. It was advantageous to raise Co contents in raw materials for removing α-Fe2O3 phase. The saturation magnetization of particles raised continually with the increase of the synthetic temperature and its maximum was 59.694 Am2·kg-1, the coercive force raised first and dropped later and its maximum was 1 273.28 A·m-1.
中图分类号 TM277
所属栏目
基金项目 国家自然科学基金资助项目(50703023); 教育部新世纪优秀人才支持计划项目(NCET-06-0396)
收稿日期 2010/5/11
修改稿日期 2011/2/12
网络出版日期
作者单位点击查看
备注陈晓芸(1987-), 女, 江苏南通人, 硕士研究生。
引用该论文: CHEN Xiao-yun,LI Hua,SU Yue-zeng,HUANG Zi-shan,LIU He-zhou. CoFe2O4 Nanoparticles Synthesized by Hydro-Thermal Method and Its Magnetic Properties[J]. Materials for mechancial engineering, 2011, 35(7): 88～92
陈晓芸,李华,苏跃增,HUANG Zi-shan,刘河洲. 水热法合成CoFe2O4纳米颗粒及其磁性能[J]. 机械工程材料, 2011, 35(7): 88～92
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参考文献
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【3】AYALA-VALENZUELA O, MATUTES-AQUINO J, BETANCOURT-GALINDO R, et al. Magnetite-cobalt ferrite nanoparticles for kerosene-based magnetic fluids[J].J Magn Mater, 2005, 294(2): 37-41.
【4】RANA S, GALLO A, SRIVASTAVA R S, et al. On the suitability of nanocrystalline ferrites as a magnetic carrier for drug delivery: functionalization, conjugation and drug release kinetics[J].Acta Biomaterialia, 2007, 3(2): 233-242.
【5】ZHAO D L, LV Q, SHEN Z M. Fabrication and microwave absorbing properties of Ni-Zn spinel ferrites[J]. J Alloy Compd, 2009, 480(2): 634-638.
【6】李永军, 刘河洲, 李华, 等.钡铁氧体包覆多壁碳纳米管复合材料的合成与表征[J].机械工程材料, 2010, 34(1): 88-91.
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【8】CEDEЙO-MATTEI Y, PERALES-PEREZ O. Synthesis of high-coercivity cobalt ferrite nanocrystals[J].Microelectr J, 2009, 40(4/5): 673-676.
【9】MOHAMED R M, RASHAD M M, HARAZ F A, et al. Structure and magnetic properties of nanocrystalline cobalt ferrite powders synthesized using organic acid precursor method[J].J Magn Mater, 2010, 322(14): 2058-2064.
【10】LEE J G, PARK J Y, KIM C S. Growth of ultra-fine cobalt ferrite particles by a sol-gel method and their magnetic prop-erties[J].J Mater Sci, 1998, 33(15): 3965-3968.
【11】BLASKOV V, PETKOV V, RUSANOV V, et al. Magnetic properties of nanophase CoFe2O4 particles[J].J Magn Mater, 1996, 162(2/3): 331-337.
【12】RAJENDRAN M, PULLAR R C, BHATTACHARYA A K, et al. Magnetic properties of nanocrystalline CoFe2O4 powders prepared at room temperature: variation with crystallite size[J].J Magn Mater, 2001, 232(1/2): 71-83.
【13】段红珍, 李巧玲, 蔺向阳, 等.钴铁氧体纳米粒子制备及其镧掺杂的磁性能研究[J].材料科学与工艺, 2009, 17(1): 87-91.
【14】JI G B, TANG S L, REN S K, et al. Simplified synthesis of single-crystalline magnetic CoFe2O4 nanorods by a surfactant-assisted hydrothermal process[J].J Cryst Growth, 2004, 270(1/2): 156-161.
【15】吕庆荣, 方庆清, 李瑞, 等.钴铁氧体纳米晶粒的结构及磁特性研究[J].安徽大学学报, 2006, 30(2): 71-74.
【16】ZHAO D, WU X, GUAN H, et al. Study on supercritical hydrothermal synthesis of CoFe2O4 nanoparticles[J].J of Supercritical Fluids, 2007, 42(2): 226-233.
【17】GU B X. Magnetic properties and magneto-optical effect of Co0.5Fe2.5O4 nanostructured films[J].Appl Phys Lett, 2003, 82(21): 3707-3709.
【18】ZHAO L J, ZHANG H J, XING Y, et al. Studies on the magnetism of cobalt ferrite nanocrystals synthesized by hydrothermal method[J].J Solid State Chem, 2008, 181(2): 245-252.
【19】COTE L J, TEJA A S, WILKINSON A P, et al. Continuous hydrothermal synthesis of CoFe2O4 nanoparticles[J].Fluid Phase Equilibr, 2003, 210(2): 307-317.
【20】LEE D H, KIM H S, LEE J Y, et al. Characterization of the magnetic properties and transport mechanisms of CoxFe3-xO4 spinel[J].Solid State Commun, 1995, 96(7): 445-449.
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