Direct synthesis of fct-structured FePt nanoparticles at low temperature with assistance of poly(N-vinyl-2-pyrrolidone)

Direct synthesis of fct-structured FePt nanoparticles was successfully achieved by using poly(N-vinyl-2-pyrrolidone) as a protective reagent at lower temperature than the case using low molecular weight ligands as a protective reagent. Experimental data suggest that a transformation of FePt nanoparticles from face-centered cubic to face-centered tetragonal (fct) structure takes place at reaction temperature of 261 °C. The results of XRD and the magnetic properties exhibit that the FePt nanoparticles synthesized at 261 °C have partially ordered fct-structure and a ferromagnetic behavior at room temperature.

Magnetic hysteresis loops at 300 K of PVP-protected FePt nanoparticles synthesized at various reaction temperatures without refluxing. FePt nanoparticles synthesized at reaction temperatures above 261 °C show a ferromagnetic behavior.Figure optionsDownload as PowerPoint slide