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.98 北京科技大学学报 2007年增刊2 450 effect.J Appl Phys.2004.95(8):4251 [2]Bronstein L,Kramer E.Berton B.Burger C.Forster S.Antoni- (110) etti M.Successive use of amphiphilic block copolymers as nanore- actors and templates:preparation of porous silica with metal 无表面活性剂 nanoparticles.Chem Mater,1999,11:1402 150 [3]龙毅，张正义，李守卫.新功能材料及其应用·北京：机械工 (200) (211) 业出版社，1997 有表面活性剂 [4]陈友存。分子基磁性材料研究。合肥：合肥工业大学出版社， 102030405060708090 2006 20v() [5]刘文伯，董承举.数字磁记录介质.北京：科学出版社，1991 [6]Liu C,Klemmer T J.Shukla N.Wu X.Weller D.Tanase M. 图5用表面活性剂和无表面活性剂2种情况下合成的铁纳米微 Laughlin D.Oxidation of FePt nanoparticles.J Magn Magn 粒的X衍射分析图 Mater,2003,266.96 [7]Wu N.Fu L.Su M.Aslam M.Wong K C.Dravid V P.Inter- 酸胺作表面活性剂、反应时间为60min、在低温下 action of fatty acid monolayers with cobalt nanoparticles. (≤180℃)通过热分解方法成功地合成了分布均匀 NanoLetters.2004.4(2):383 的、球形的铁纳米微粒.随着反应初始物羰基铁的 [8]Choi C J.Tolochko O.Kim B K.Preparation of iron nanoparti- 浓度从0.296mol/L(加入量3.6mL)增加到0.444 cles by chemical vapor condensation.Mater Lett.2002.56:289 [9]Guo F.Zheng H.Yang Z,Qian Y,Synthesis of cobalt nanopar- mol/L(加入量5.4mL),微粒的平均尺寸从11.2nm ticles in ethanol hydrazine alkaline system (EHAS)at room tem 减小到8.6nm,相对应的饱和磁化强度也从从 perature.Mater Lett.2002.56:906 18.5减少到11.9kA/m,这些铁微粒显示出无定形 [10]Wirth S.Molnar S.von.Field M.Awschalom DD.Mag 结构，但它们的表面很容易在进行测定的过程中被 netism of nanometer-scale iron particles arrays.J Appl Phys. 氧化成尖晶石结构的氧化物. 1999,85(8):5249 [11]Sivakumar M,Gedanken A.Zhong W,Du Y W,Bhattacharya 参考文献 D.Yeshurun Y.Felner I.Nanophase formation of strontium hexaferrite fine powder by the sonochemical method using Fe [1]Petit C.RusponiS.Brune H.Magnetic properties of cobalt and (CO)s.J Magn Magn Mater.2004.268:95 cobalt platinum nanocrystals investigated by magneto optical Kerr Preparation of monodisperse iron nanoparticles at low temperature SHAO Huiping,HUANG Yuqiang2,GUO Zhimeng,Lin Tao,HAO Junjie,LUO Ji 1)School of Materials Science and Engineering.Beijing Science and Technology University.Beijing 100083.China 2)Guohao Research Institute of Micromagnetic Electronic Intelligent Sensor,Beijing 100083.China ABSTRACI Monodisperse iron nanoparticles were prepared by thermal decomposition of iron carbonyl at low temperatures of 160-180C in kerosene.The synthesized iron nanoparticles were spherical and their average size decreased from 11.2 to 8.6nm as increasing the initial concentration of iron carbonyl from 0.296 to 0.444 mol/L.The synthesized iron nanoparticles are amorphous,but the surface of the particles is easily oxidized and is spinel structure iron oxide by HRTEM. KEY WORDS iron nanoparticles:iron carbonyl;thermal decomposition图5 用表面活性剂和无表面活性剂2种情况下合成的铁纳米微 粒的 X 衍射分析图 酸胺作表面活性剂、反应时间为60min、在低温下 （≤180℃）通过热分解方法成功地合成了分布均匀 的、球形的铁纳米微粒．随着反应初始物羰基铁的 浓度从0∙296mol／L（加入量3∙6mL）增加到0∙444 mol／L（加入量5∙4mL）微粒的平均尺寸从11∙2nm 减小到8∙6nm．相对应的饱和磁化强度也从从 18∙5减少到11∙9kA／m．这些铁微粒显示出无定形 结构但它们的表面很容易在进行测定的过程中被 氧化成尖晶石结构的氧化物． 参 考 文 献 ［1］ Petit CRusponi SBrune H．Magnetic properties of cobalt and cobalt-platinum nanocrystals investigated by magneto-optical Kerr effect．J Appl Phys200495（8）：4251 ［2］ Bronstein LKramer EBerton BBurger CForster SAntonietti M．Successive use of amphiphilic block copolymers as nanoreactors and templates：preparation of porous silica with metal nanoparticles．Chem Mater199911：1402 ［3］ 龙毅张正义李守卫．新功能材料及其应用．北京：机械工 业出版社1997 ［4］ 陈友存．分子基磁性材料研究．合肥：合肥工业大学出版社 2006 ［5］ 刘文伯董承举．数字磁记录介质．北京：科学出版社1991 ［6］ Liu CKlemmer T JShukla NWu XWeller DTanase M Laughlin DOxidation of FePt nanoparticles．J Magn Magn Mater2003266：96 ［7］ Wu NFu LSu MAslam MWong K CDravid V P．Interaction of fatty acid monolayers with cobalt nanoparticles． NanoLetters20044（2）：383 ［8］ Choi C JTolochko OKim B K．Preparation of iron nanoparticles by chemical vapor condensation．Mater Lett200256：289 ［9］ Guo FZheng HYang ZQian YSynthesis of cobalt nanoparticles in ethanol hydrazine alkaline system （EHAS） at room temperature．Mater Lett200256：906 ［10］ Wirth SMolnar S．vonField MAwschalom D D．Magnetism of nanometer-scale iron particles arrays．J Appl Phys 199985（8）：5249 ［11］ Sivakumar MGedanken AZhong WDu Y WBhattacharya DYeshurun YFelner I．Nanophase formation of strontium hexaferrite fine powder by the sonochemical method using Fe （CO）5．J Magn Magn Mater2004268：95 Preparation of monodisperse iron nanoparticles at low temperature SHAO Huiping 1）HUA NG Y uqiang 2）GUO Zhimeng 1）L in T ao 1）HAO Junjie 1）LUO Ji 1） 1） School of Materials Science and EngineeringBeijing Science and Technology UniversityBeijing100083China 2） Guohao Research Institute of Micromagnetic Electronic Intelligent SensorBeijing100083China ABSTRACT Monodisperse iron nanoparticles were prepared by thermal decomposition of iron carbonyl at low temperatures of 160—180℃ in kerosene．The synthesized iron nanoparticles were spherical and their average size decreased from11∙2to8∙6nm as increasing the initial concentration of iron carbonyl from0∙296to0∙444 mol／L．The synthesized iron nanoparticles are amorphousbut the surface of the particles is easily oxidized and is spinel structure iron oxide by HRTEM． KEY WORDS iron nanoparticles；iron carbonyl；thermal decomposition ·98· 北 京 科 技 大 学 学 报 2007年 增刊2