The Effect of 1, 2‐ Hexadecadeniol and LiBEt3H Superhydride on the Size of FePt Nanoparticles

摘要

Monodisperse magnetic FePt nanoparticles have potential applications in high performance high‐density magnetic storage media. In this paper, FePt nanoparticles were synthesized by reduction of FeCl_2.4H_2O and Pt(acac)_2 at 250?°C under N_2 atmosphere. The effects of 1,2‐Hexadecadeniol and LiBEt3H on the size and uniformity of FePt nanoparticles have been studied. TEM observations revealed that 1,2 Hexadecadeniol as reducing reagent, first create the 2 nm Pt core at 190?°C and then LiBEt3H superhydride increase the size of FePt nanoparticles to 5 nm at 210?°C, when added to the reaction solution. The mean diameter of FePt nanoparticles decreases to 4 nm by increasing reaction temperature to 250?°C in reflux stage. XRD patterns showed that FePt nanocrystals form L1_0 superlattice structure after annealing at 700?°C for 4 hours. The results of EDS analysis indicated that the composition of FePt nanoparticles in nucleation, growth and beginning of the reflux stage give Fe_(14)Pt_(86), Fe_(63)Pt_(37), and Fe_(58)Pt_(42) stoichiometry, respectively.