Abstract
We report a single-step chemical synthesis of iron oxide hollow nanospheres with 9.3 nmin diameter. The sample presents a narrow particle diameter distribution andchemical homogeneity. The hollow nature of the particles is confirmed by HRTEMand HAADF STEM analysis. Electron and x-ray diffraction show that the outermaterial component is constituted by 2 nm ferrite crystals. Mössbauer data providefurther evidence for the formation of iron oxide with high structural disorder,magnetically ordered at 4.2 K and superparamagnetism at room temperature.An unusual magnetic behavior under an applied field is reported, which can beexplained by the large fraction of atoms existing at both inner and outer surfaces.
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