title: A fluorescent magnetic nanoalloy--Lanthanon-doped FePt:RE.
abstract: Employing dibenzo-24-crown-8-ether (DB24C8) as a phase-transfer catalyst, monodispersed fluorescent lanthanon-doped magnetic FePt:RE (RE=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=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 L1 0 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.
authors.affiliation: Department of Chemistry, Tongji University, 1239# Siping Road, Shanghai 200092, China. m_wen@mail.tongji.edu.cn
authors.forename: Ming
authors.initials: M
authors.lastname: Wen
authors.forename: Wengang
authors.initials: W
authors.lastname: Zhao
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.forename: YuanZheng
authors.initials: Y
authors.lastname: Zhu
authors.forename: YaFen
authors.initials: Y
authors.lastname: Wang
authors.forename: Qingsheng
authors.initials: Q
authors.lastname: Wu