Abstract
Silver iron oxide nanoparticles of fairly small size (average diameter∼1 nm) with narrow size distribution have been synthesized by the interaction of colloidalβ-Fe2O3 and silver nanoparticles. The surface morphology and size of these particles havebeen analyzed by using atomic force microscopy (AFM), field emission scanningelectron microscopy (FESEM) and transmission electron microscopy (TEM).Their structural analysis has been carried out by employing x-ray diffraction(XRD), selected-area electron diffraction (SAED), optical and infrared (IR)spectroscopic techniques. The ageing of these particles exhibits the formationof self-assembly, possibly involving weak supramolecular interactions betweenAgIO4 andFeIIIO4 species. These particles display the onset of absorption in the near-infrared region and havehigher absorption coefficient in the visible range compared to that of its precursors. Magneticmeasurements reveal an interesting transition in their magnetic behavior from diamagnetic tosuperparamagnetic. The magnetic moment of these particles attains a limiting value of about0.19 emu cm−2, which is more than two times higher than that of colloidalβ-Fe2O3. With enhanced optical and magnetic properties, this system is suggested to have possibleapplications in optoelectronic and magnetic devices.
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