Open Access Nano Express

Synthesis and Magnetic Properties of Nearly Monodisperse CoFe2O4Nanoparticles Through a Simple Hydrothermal Condition

Xing-Hua Li1, Cai-Ling Xu12, Xiang-Hua Han1, Liang Qiao1, Tao Wang1* and Fa-Shen Li1*

Author Affiliations

1 Institute of Applied Magnetics, Key Laboratory of Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, 730000, Lanzhou, People’s Republic of China

2 Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University, 730000, Lanzhou, People’s Republic of China

For all author emails, please log on.

Nanoscale Research Letters 2010, 5:1039-1044  doi:10.1007/s11671-010-9599-9

Published: 16 April 2010

Abstract

Nearly monodisperse cobalt ferrite (CoFe2O4) nanoparticles without any size-selection process have been prepared through an alluring method in an oleylamine/ethanol/water system. Well-defined nanospheres with an average size of 5.5 nm have been synthesized using metal chloride as the law materials and oleic amine as the capping agent, through a general liquid–solid-solution (LSS) process. Magnetic measurement indicates that the particles exhibit a very high coercivity at 10 K and perform superparamagnetism at room temperature which is further illuminated by ZFC/FC curves. These superparamagnetic cobalt ferrite nanomaterials are considered to have potential application in the fields of biomedicine. The synthesis method is possible to be a general approach for the preparation of other pure binary and ternary compounds.

Keywords:
Monodisperse; Cobalt ferrite; Superparamagnetic; Nanoparticles; Magnetic; Biomedcine