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Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets
Published on: November 2, 2011
Synthesis of FePt nanocubes and their oriented self-assembly
Min Chen1, Jaemin Kim, J P Liu
1IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA.
Journal of the American Chemical Society
|June 1, 2006
Summary
Monodisperse iron-platinum (FePt) nanocubes were synthesized and self-assembled into a superlattice array. This controlled fabrication method is promising for high-density data storage and permanent magnets.
Area of Science:
- Materials Science
- Nanotechnology
- Magnetism
Background:
- Iron-platinum (FePt) nanoparticles are crucial for high-density data storage and permanent magnets.
- Controlling the shape and assembly of FePt nanoparticles is key to optimizing their magnetic properties.
Purpose of the Study:
- To synthesize monodisperse FePt nanocubes with controlled shape and self-assembly.
- To investigate the structural and magnetic properties of the self-assembled FePt nanocube superlattices.
- To explore the potential of this fabrication approach for advanced magnetic applications.
Main Methods:
- Synthesis of FePt nanocubes via controlled decomposition of Fe(CO)5 and reduction of Pt(acac)2 at 205°C.
- Controlled addition of oleic acid and oleylamine to direct nanoparticle formation.
- Self-assembly of FePt nanocubes into superlattice arrays.
- Thermal annealing to induce chemical ordering (fcc to fct FePt) and texture development.
Main Results:
- Monodisperse FePt nanocubes were successfully synthesized.
- Self-assembly resulted in a superlattice array with (100) textured FePt cubes.
- Thermal annealing converted disordered fcc FePt to ordered fct FePt.
- The annealed assembly exhibited a strong (001) texture, both parallel and perpendicular to the substrate.
Conclusions:
- Shape-controlled synthesis and self-assembly of FePt nanocubes enable the creation of ordered superlattice arrays.
- The resulting ordered FePt nanocrystal arrays possess desirable magnetic properties.
- This approach is a promising strategy for fabricating FePt-based materials for high-density information storage and high-performance permanent magnets.
