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

Abstract

Abstract It was reported a facile strategy to fabricate magnetite (Fe 3 O 4 ) single‐crystal particles with critical single‐domain size by employing graphene oxide (GO) sheets as template. In this method, the small‐sized Fe 2 O 3 nanoparticles were first synthesized, and then low‐temperature annealing under H 2 would convert them into large‐sized Fe 3 O 4 single‐crystal particles. The synthetic particles with an average size of 100 nm exhibit high saturation magnetization ( M s ) of 0.085 A·m 2 ·g −1 , which is very close to theoretical value, being among the highest values in ever reported for Fe 3 O 4 made from chemical methods. On this basis, the small‐sized Fe 3 O 4 particles (average size of 30 nm) were also fabricated by coating with Na 2 CO 3 shell.