2 research outputs found
Air-stable magnetic cobalt-iron (Co7Fe3) bimetallic alloy nanostructures via co-digestive ripening of cobalt and iron colloids
No full textMorphological Evolution in Air-Stable Metallic Iron Nanostructures and Their Magnetic Study
No full textIron nanostructures with morphology
ranging from discrete nanoparticles to nearly monodisperse hierarchical
nanostructures have been successfully synthesized using solvated metal
atom dispersion (SMAD) method. Such a morphological evolution was
realized by tuning the molar ratio of ligand to metal. Surface energy
minimization in confluence with strong magnetic interactions and ligand-based
stabilization results in the formation of nanospheres of iron. The
as-prepared amorphous iron nanostructures exhibit remarkably high
coercivity in comparison to the discrete nanoparticles and bulk counterpart.
Annealing the as-prepared amorphous Fe nanostructures under anaerobic
conditions affords air-stable carbon-encapsulated Fe(0) and Fe3C nanostructures with retention of the morphology. The resulting
nanostructures were thoroughly analyzed by powder X-ray diffraction
(PXRD), thermogravimetric analysis (TGA), transmission electron microscopy
(TEM), and Raman spectroscopy. TGA brought out that Fe3C nanostructures are more robust toward oxidation than those of α-Fe.
Finally, detailed magnetic studies were carried out by superconducting
quantum interference device (SQUID) magnetometer and it was found
that the magnetic properties remain conserved even upon exposure of
the annealed samples to ambient conditions for months
