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A facile wet chemical method has been used to synthesize bifunctional core-shell nanoparticles of Fe3O4@RE(DBM)3·Phen (RE=Eu3+,Tb3+) showing an interesting combination of magnetic and luminescent properties. This method is convenient, cheap, and efficient. The morphology, structure, luminescent, and magnetic properties of the nanoparticles were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis absorption, fluorescence emission, and superconducting quantum interference device magnetometer (SQUID-VSM). The maximum emission peaks of novel Eu3+ and Tb3+ nanocomposites are at 618 nm and at 514 nm, respectively. And their corresponding special saturation magnetization Ms. are 25.853 emu/g and 24.015 emu/g, respectively. For the nanoparticles, it is shown that there have better magnetic behavior and they may act as red- and green-emitting material with potential application for fluorescent magnetic particle testing. Moreover, this chemical route could be used to obtain the development of several bifunctional systems of other rare earth ions for practical application. [ABSTRACT FROM AUTHOR]

Hierarchical Fe3O4 nanospheres with superparamagnetism have been fabricated via a solvothermal method without any surfactants. The effect of reaction parameters like the types of the reagent, the reaction time, and the reagent concentration on the morphology and structure of the resultant samples are investigated. In this method, ferric chloride (FeCl3 ⋅ 6H2O) is used as the iron source, and EG acts as both solvent and reducing agent. The presence of NaHCO3 or Na2CO3 provides alkine condition and gaseous bubbles in the control over the size of Fe3O4 nanospheres. The formation mechanism for Fe3O4 nanospheres is illustrated by an Ostwald ripening process. The Fe3O4 nanospheres were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and superconducting quantum interference device magnetometer (SQUID-VSM). The Fe3O4 nanospheres exhibited a wider size distribution at the amount of 0.397 mol/L NaHCO3, showing a high saturation magnetization close to 84.46 emu/g. The Fe3O4 nanospheres soluble in deionized water is also investigated. [ABSTRACT FROM AUTHOR]