A fluorescent magnetic nanoalloy--Lanthanon-doped FePt:RE.
A fluorescent magnetic nanoalloy--Lanthanon-doped FePt:RE.
复制标题
DOI：
10.1016/j.jcis.2008.02.003
复制
发表时间：
2008-06
影响因子：
9.9
通讯作者：
M. Wen;Wengang Zhao;Tao Zhang;Yuanzheng Zhu;Yafen Wang;Qingsheng Wu
中科院分区：
文献类型：
--
作者：
M. Wen;Wengang Zhao;Tao Zhang;Yuanzheng Zhu;Yafen Wang;Qingsheng Wu
以二苯并-24-冠-8-醚（DB24 C8）为相转移催化剂，在溶剂热体系中，以油酸为稳定剂，丙二醇为还原剂，分别还原H2 PtCl 6·6 H2O、Fe 2（C2 O 4）3·5 H2O和RE（NO3）3（RE= Eu、Dy和Ce），合成了粒径约为3 nm的单分散稀土掺杂磁性FePt：RE（RE= Eu、Dy和Ce）荧光纳米粒子。在873 K退火处理后，FePt：RE纳米颗粒转变为有序的L10结构，同时伴随着矫顽力的增加。有趣的是，非晶形成的趋势是加强在铕掺杂的FePt：Eu合金伴随着矫顽力的增强。其热稳定性表明铕的加入抑制了相变。此外，光学测量结果证明了FePt：Dy合金纳米颗粒具有荧光性质。
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 L10structure 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.