Analyzing the structure of CoFe-Fe ₃O ₄ core-shell nanoparticles by electron imaging and diffraction

Structure analysis of multifunctional nanoparticles could be a complex process. In this paper, we demonstrate the step-by-step techniques used for identifying the structure of the CoFe-Fe 3C 4 nanoparticles, which are composed of ∼4-nm CoFe cores and covered with ∼3-nm Fe 3O 4 polynanocrystallites. The techniques demonstrated are general and can be adopted for analysis of any nanoparticles of interest in physical chemistry.