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Gold cluster formation on a fullerene surface.
H Kröger1, P Reinke, M Büttner
1II. Physikalisches Institut, Universität Göttingen, Germany. helge.kroeger@phys.uni-goettingen.de
The Journal of Chemical Physics
|January 6, 2006
Summary
Gold cluster growth on fullerene films was studied. Researchers observed island growth and found that gold clusters form on fullerene surfaces, with the film showing good thermal stability up to 650°C.
Area of Science:
- Surface Science
- Materials Science
- Nanotechnology
Background:
- Fullerene films offer unique corrugated surfaces with diverse bonding sites.
- Understanding metal-cluster interactions on fullerene substrates is crucial for novel material development.
Purpose of the Study:
- To investigate the growth dynamics and interfacial interactions of gold (Au) clusters on fullerene thin films.
- To explore the influence of fullerene surface morphology on Au cluster formation and stability.
Main Methods:
- In situ ultraviolet and X-ray photoelectron spectroscopy (UPS and XPS) were employed.
- Experiments involved depositing Au onto fullerene and vice versa, followed by thermal annealing.
Main Results:
- Island growth mode observed for both Au on fullerene and fullerene on Au.
- Chemisorption of the first C60 monolayer onto gold was detected; no significant charge transfer occurred.
- Au clusters grew continuously on fullerene, lacking specific nucleation sites, unlike silicon clusters.
- The Au-cluster-covered fullerene film exhibited high thermal stability up to 650°C, with Au presence delaying fullerene sublimation.
Conclusions:
- Fullerene surfaces act as templates for Au cluster growth, though specific nucleation sites are not identified.
- The composite film demonstrates excellent thermal stability, suggesting potential applications in high-temperature environments.
- The interaction is primarily governed by surface morphology and initial chemisorption, with limited electronic charge transfer.