Controlled synthesis and assembly of FePt nanoparticles

摘要: Monodisperse 4 nm FePt magnetic nanoparticles were synthesized by superhydride reduction of FeCl2 and Pt(acac)2 at high temperature, thin assemblies with controlled thickness formed via polymer mediated self-assembly. Adding (LiBEt3H) to the phenyl ether solution in presence oleic acid, oleylamine, 1,2-hexadecanediol 200 °C, followed refluxing 263 led monodisperse nanoparticles. The initial molar ratio metal precursors was retained during synthesis, final composition particles readily tuned. Alternately, adsorbing a layer polyethylenimine (PEI) onto solid substrate resulted nanoparticle tunable thickness. Chemical analysis revealed that more iron oxide present thinner annealed lower temperature or for shorter time. Thermal annealing induced internal particle structure chan...