Polyol Process Synthesis of Monodispersed FePt Nanoparticles
Authors:
- Xiaowei WuXWXiaowei Wu
- Timothy KlemmerTKTimothy Klemmer
- Nisha ShuklaNSNisha Shukla
- Xiaomin YangXYXiaomin Yang
- Dieter WellerDWDieter Weller
- Anup G. RoyARAnup G. Roy
- Mihaela TanaseMTMihaela Tanase
- David LaughlinDLDavid Laughlin
- 24 April 2004
- journal article
- letter
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry B
- Vol. 108 (20) , 6121-6123
Abstract
Monodispersed FePt nanoparticles are synthesized by reduction of iron(II) acetylacetonate and platinum(II) acetylacetonate with 1,2-hexadecanediol as the reducing reagent in the polyol process. As-prepared FePt nanoparticles are chemically disordered with fcc phase. Transmission electron microscopy (TEM) images show a self-assembled particle array with an average particle size of 3 nm and a standard deviation about 10%. The transformation from chemically disordered fcc to chemically ordered L10 phase is achieved by annealing at 650 °C for 30 min in Ar atmosphere where the oxygen level is less than 1 ppm. Magnetic hysteresis measurements show a coercivity of 9.0 kOe at 293K, and 16.7 kOe at 5 K for the annealed FePt nanoparticles.Keywords
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