Morphologies and Magnetic Properties of Cobalt-Iron Prussian Blue Analogues Nanoparticles Synthesized in Microemulsion

The structure-dependent magnetic properties of cobalt-iron Prussian blue analogues (PBAs) with different morphologies synthesized in microemulsion were systematically explored by the characterization of XRD, IR, SQUID techniques, etc. And it was observed that both the w (water-to-surfactant molar ratio) and reactant concentrations had a significant effect on the morphologies and structures of the products. The magnetic nanoparticles of cobalt-iron Prussian blue analogues (PBAs) with novel morphologies, e.g., hollow particles in the form of FeIII-CN-CoII, FeII-CN-Co,II and FeII-CN-CoIII entity were prepared. Our results indicated that the nanomaterials possessed distinct magnetic properties in that their coercivities were intensely dependent on sample structure, which was determined by cobalt-to-iron ratios and potassium contents.