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Structural and compositional evolution of FePt nanocubes in oganometallic synthesis
Changwang Zhang1, Hanbin Wang1, Yuping Mu1
1Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, People's Republic of China.
Nanoscale Research Letters
|November 21, 2014
Summary
Iron-platinum (FePt) nanocubes form rapidly through precursor decomposition. Iron pentacarbonate drives anisotropic growth, with platinum-rich nucleation followed by iron deposition influencing FePt nanocube morphology and composition.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Synthesis
Background:
- FePt nanocubes are of interest for applications requiring specific magnetic and structural properties.
- Understanding the synthesis mechanism is crucial for controlling nanocrystal formation and properties.
Purpose of the Study:
- To investigate the formation mechanisms of FePt nanocubes synthesized via pyrolysis.
- To elucidate the role of precursors, temperature, and molar ratios in nanocube formation and growth.
Main Methods:
- Pyrolysis of iron pentacarbonate [Fe(CO)5] and platinum(II) acetylacetonate [Pt(acac)2].
- Transmission electron microscopy (TEM) for time-evolution analysis of structure, morphology, and composition.
Main Results:
- FePt nanocubes form rapidly between 160°C and 180°C.
- Formation involves Pt-rich nucleation followed by slow Fe deposition, with a surface Fe atomic layer.
- Iron pentacarbonate promotes anisotropic growth, and the precursor molar ratio dictates composition, morphology, and structure.
Conclusions:
- The study details the nucleation and growth mechanism of FePt nanocubes.
- Iron pentacarbonate is identified as critical for anisotropic growth, enabling control over FePt nanocube characteristics.
