A fluorescent magnetic nanoalloy—Lanthanon-doped FePt:RE

Employing dibenzo-24-crown-8-ether (DB24C8) as a phase-transfer catalyst, monodispersed fluorescent lanthanon-doped magnetic FePt:RE (RE=EuRE=Eu, Dy, and Ce) nanoparticles about 3 nm in size were synthesized through the reduction of H2PtCl6⋅6H2O, Fe2(C2O4)3⋅5H2O, and RE(NO3)3 (RE=EuRE=Eu, Dy, and Ce) by propylene glycol using oleic acid as the stabilizer in the solvent-thermal system. The conversion of the as-synthesized chemically disordered fcc FePt:RE nanoparticles to a chemically ordered L10 structure occurred after annealing treatment at 873 K, and was simultaneously accompanied by a coercivity increase. It is interesting that the amorphous formation trend is strengthened in an europium-doped FePt:Eu alloy accompanied by enhancement of the coercive force. Its thermal stability indicated that the addition of europium can inhibit the phase transformation. Moreover, the optical measurement results proved that FePt:Dy alloy nanoparticles have fluorescent properties.

Graphical abstractThe new fluorescent lanthanon-doped magnetic FePt:RE nanoparticles with sizes of 3 nm were synthesized in a solvent-thermal system. Eu, Dy, and Ce doped in FePt led to the fluorescence properties.Figure optionsDownload full-size imageDownload as PowerPoint slide