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Thermal effect on structure organizations in cobalt-fullerene nanocomposition
Vasily Lavrentiev1, Jiri Vacik, Hiroshi Naramoto
1Nuclear Physics Institute AS CR, 250 68 Husinec-Rez 130, Czech Republic.
Journal of Nanoscience and Nanotechnology
|April 2, 2010
Summary
The deposition temperature significantly alters cobalt-fullerene (Co-C60) nanocomposite structures. Higher temperatures lead to increased fullerene decomposition and graphitic island formation, influenced by cobalt catalysis.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Cobalt-fullerene (Co-C60) nanocomposites are synthesized for unique electronic and structural properties.
- Understanding the influence of synthesis parameters like deposition temperature is crucial for controlling material characteristics.
Purpose of the Study:
- To investigate the effect of deposition temperature on the structural evolution of Co-C60 nanocomposites.
- To analyze the phase separation, polymerization, and decomposition behaviors within the nanocomposite films.
Main Methods:
- Simultaneous deposition of cobalt and fullerene onto sapphire substrates.
- Characterization using Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), and Raman Spectroscopy.
- Analysis of structural changes with increasing deposition temperature from room temperature to 400°C.
Main Results:
- Granule-like structures observed, with surface hills at room temperature indicating stress.
- Raman spectroscopy revealed Co-C60 polymerization and amorphous carbon (a-C) formation due to C60 decomposition.
- Increasing temperature smoothed surfaces, decreased polymerization, and enhanced a-C content, with significant C60 decomposition and graphitic island nucleation at 400°C.
Conclusions:
- Deposition temperature is a critical factor in controlling Co-C60 nanocomposite morphology and composition.
- Cobalt acts catalytically, promoting C60 decomposition at higher temperatures.
- The findings provide insights into tailoring Co-C60 nanocomposites for specific applications.
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