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.
基金
financially supported by the National Natural Science Foundation of China(No.51701109)
