Controlled Synthesis and Assembly of FePt Nanoparticles [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 2003. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- 22 pages : digital, PDF file
- Additional Creators:
- Stanford Linear Accelerator Center, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
- Monodisperse 4 nm FePt magnetic nanoparticles were synthesized by superhydride reduction of FeCl₂ and Pt(acac)₂ at high temperature, and thin assemblies of FePt nanoparticles with controlled thickness were formed through polymer mediated self-assembly. Adding superhydride (LiBEt₃H) to the organic solution of FeCl₂ and Pt(acac)₂ in the presence of oleic acid, oleylamine and 1,2-hexadecanediol at 200 C, followed by refluxing at 263 C led to monodisperse 4 nm FePt nanoparticles. The initial molar ratio of the metal precursors was retained during the synthesis; and the final FePt composition of the particles was readily tuned. Alternatively absorbing a layer of polyethylenimine (PEI) and the FePt nanoparticles onto a solid substrate resulted in nanoparticle assemblies with tunable thickness. Chemical analysis of the assemblies revealed that more iron oxide was present in the thinner assemblies annealed at lower temperature or for shorter time. Thermal annealing induced the internal particle structure change from chemically disordered fee to chemically ordered fct and transformed the thin assembly from superparamagnetic to ferromagnetic. This controlled synthesis and assembly can be used to fabricate FePt nanoparticle-based functional devices for future nanomagnetic applications.
- Published through SciTech Connect., 06/20/2003., "slac-pub-9993", and Toney, Michael F.
- Type of Report and Period Covered Note:
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