Journal
NANOMATERIALS
Volume 11, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/nano11051141
Keywords
iron; colloids; magnetic particles; core; shell; chemical synthesis
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Fe-based colloids with a core/shell structure consisting of metallic iron and iron oxide were synthesized using a hot injection reaction of iron pentacarbonyl in a multi-surfactant mixture. The size of the colloidal particles, crystal structure, morphology, and magnetic properties were studied, with higher injection temperatures enhancing stability and resistance against oxidation. Functionalization of the colloids' surface in a nonpolar solvent resulted in a stable dispersion.
Fe-based colloids with a core/shell structure consisting of metallic iron and iron oxide were synthesized by a facile hot injection reaction of iron pentacarbonyl in a multi-surfactant mixture. The size of the colloidal particles was affected by the reaction temperature and the results demonstrated that their stability against complete oxidation related to their size. The crystal structure and the morphology were identified by powder X-ray diffraction and transmission electron microscopy, while the magnetic properties were studied at room temperature with a vibrating sample magnetometer. The injection temperature plays a very crucial role and higher temperatures enhance the stability and the resistance against oxidation. For the case of injection at 315 degrees C, the nanoparticles had around a 10 nm mean diameter and revealed 132 emu/g. Remarkably, a stable dispersion was created due to the colloids' surface functionalization in a nonpolar solvent.
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