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Published on: January 7, 2019
Chemically synthesized FePt nanoparticles with controlled particle size, shape and composition.
Levent Colak1, George C Hadjipanayis
1Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA. colak@udel.edu
Nanotechnology
|November 3, 2009
Summary
Monodisperse iron-platinum (Fe-Pt) nanoparticles were synthesized using thermal decomposition and reduction methods. Controlling precursor ratios and reaction conditions enabled tuning of nanoparticle size, shape (cubic or nanorods), and magnetic coercivity.
Area of Science:
- Materials Science
- Nanotechnology
- Magnetism
Background:
- Iron-platinum (Fe-Pt) nanoparticles are of interest for magnetic applications.
- Controlling nanoparticle size, shape, and magnetic properties is crucial for their performance.
Purpose of the Study:
- To synthesize monodisperse Fe-Pt nanoparticles with controlled composition and morphology.
- To investigate the effects of synthesis parameters on nanoparticle formation.
- To evaluate the magnetic properties of the synthesized Fe-Pt nanoparticles.
Main Methods:
- Thermal decomposition of iron pentacarbonyl [Fe(CO)5] and reduction of platinum acetylacetonate [Pt(acac)2].
- Use of oleic acid and oleyl amine as surfactants in dibenzyl ether solvent.
- Adjustment of Fe(CO)5/Pt(acac)2 molar ratio and precursor injection temperature.
- Controlled surfactant injection time for nanorod formation.
- Annealing at 800°C to enhance coercivity.
Main Results:
- Monodisperse Fe-Pt nanoparticles were successfully synthesized.
- Particle composition was tunable via the Fe(CO)5/Pt(acac)2 molar ratio.
- Nanoparticle size was controlled by iron precursor injection temperature.
- Cubic nanoparticles formed under specific low-temperature, slow-heating conditions.
- Nanorods were formed by adjusting surfactant injection time.
- As-synthesized nanoparticles exhibited low coercivity, which increased to 7 kOe after annealing.
Conclusions:
- The study demonstrates a method for controlled synthesis of Fe-Pt nanoparticles.
- Key parameters for controlling Fe-Pt nanoparticle morphology (cubic vs. nanorods) and size were identified.
- Annealing significantly enhances the magnetic coercivity of Fe-Pt nanoparticles.
