A facile synthesis of magnetite single-crystal particles by employing GO sheets as template for promising application in magnetic fluid  

作　　者：Zhen Qin Zhen-Hui Ma Jian-Kang Zhi Yong-Ling Fu 

机构地区：[1]School of Mechanical Engineering and Automation, Beihang University, Beijing 100083,China [2]College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124,China

出　　处：《Rare Metals》2019年第8期764-769,共6页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51701109)

摘　　要：It was reported a facile strategy to fabricate magnetite(Fe3O4)single-crystal particles with critical single-domain size by employing graphene oxide(GO)sheets as template.In this method,the small-sized Fe2 O3 nanoparticles were first synthesized,and then low-temperature annealing under H2 would convert them into large-sized Fe3 O4 single-crystal particles.The synthetic particles with an average size of 100 nm exhibit high saturation magnetization(Ms)of 0.085 A·m^2·g^-1,which is very close to theoretical value,being among the highest values in ever reported for Fe3O4 made from chemical methods.On this basis,the small-sized Fe3 O4 particles(average size of 30 nm)were also fabricated by coating with Na2 CO3 shell.It was reported a facile strategy to fabricate magnetite（Fe3 O4）single-crystal particles with critical single-domain size by employing graphene oxide（GO）sheets as template.In this method,the small-sized Fe2 O3 nanoparticles were first synthesized,and then low-temperature annealing under H2 would convert them into large-sized Fe3 O4 single-crystal particles.The synthetic particles with an average size of 100 nm exhibit high saturation magnetization（Ms）of 0.085 A·m2·g-1,which is very close to theoretical value,being among the highest values in ever reported for Fe3 O4 made from chemical methods.On this basis,the small-sized Fe3 O4 particles（average size of 30 nm）were also fabricated by coating with Na2 CO3 shell.

关 键 词：Fe3O4 Critical SINGLE-DOMAIN size SATURATION MAGNETIZATION Chemical synthesis 

分 类 号：TF[冶金工程]