树枝状磁性纳米钴微晶的液相法制备及性能研究  

Liquid Phase Preparations and Performances of Magnetic Dendritic Nanocrystalline Co

作　　者：曹新富[1,2] 杨毅[1] 李凤生[1] 李玉冰[2] 刘建勋[1] 

机构地区：[1]南京理工大学化工学院,江苏南京210094 [2]中国航天科工集团六院四十六所,内蒙古呼和浩特010010

出　　处：《南京理工大学学报》2008年第6期793-796,共4页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(50306008);总装预先研究基金

摘　　要：为了获得磁性优异的纳米材料,采用液相法制备了纳米Co微晶,并对微晶产物进行了XRD、SEM、TEM、EDAX和BET表征。结果表明:纳米Co微晶外形呈树枝状、结晶度高,呈现出极高的矫顽力(175.2 Oe)及高比饱和磁化强度(129.56 emu.g-1)等优异磁性能。通过对树枝状纳米晶体Co形成机理的初步分析,认为反应过程中醇和联氨可以与Co2+形成配位体,在配位过程中加强了还原反应,并阻止了Co的团聚。To obtain nanometer materials with excellent magnetization, nanometer cobalt crystals are prepared by liquid phase preparation method. The nanometer crystals are characterized by XRD, TEM, SEM, EDAX and BET. The results show that the nanometer cobalt crystals have good crystallization and dendritic shape in microstructure. The nanometer cobalt particles have 175.20e coercive force （H） and 129.56 emu·g^-1 magnetization intensity （MS）. It shows very outstanding mag netization in magnetization intensity and coercive force. The analysis of the nanometer dendritic cobalt mechanism shows that the alcohol and hydrazine can form ligand with cobahion （Co^2＋ ） during the reaction process and the complexation reaction can promote the reductive reaction and prevent the coagulation of nanocrystalline cobahs.

关 键 词：树枝状晶体 纳米微晶 钴 液相法 磁性 

分 类 号：O643[理学—物理化学] TQ56[理学—化学]