Direct liquid phase synthesis of ordered L1(0) FePt colloidal particles with high coercivity using an Au nanoparticle seeding approach

作者：Tzitzios Vasileios^*; Basina Georgia; Tzitzios Nikolaos; Alexandrakis Vasileios; Hu Xiaocao; Hadjipanayis George

来源：New Journal of Chemistry, 2016, 40(12): 10294-10299.

DOI：10.1039/c6nj01801g

Ordered L1(0) and high coercivity FePt nanoparticles were successfully synthesized via a chemical method using pre-synthesized Au nanoparticles as nuclei seeds. The size of the Au nanoparticles seems to play a significant role in the formation of the tetragonal phase (L1(0)) FePt colloidal nanoalloys. Seeding with similar to 12 nm diameter monodispersed Au nanoparticles in the reaction mixture was found to lead to partial L1(0) FePt particles with 2.8 kOe coercivity at room temperature, while seeding with similar to 6 nm Au nanoparticles leads to the formation of well L1(0) ordered FePt colloidal particles with 8.8 kOe coercivity at room temperature, one of the highest values for the direct liquid phase synthesis of L1(0) FePt colloidal particles. Furthermore, seeding with smaller Au particles decreases the ordering temperature from 360 degrees C to 300 degrees C leading to the formation of more uniform well-shaped nanoparticles.

• 出版日期2016-12