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O: Oberflächenphysik
O 28: Postersitzung (Elektronische Struktur, Grenzfläche fest-flüssig, Halbleiteroberflächen und -grenzflächen, Magnetismus und Symposium SYXM, Methodisches, Nanostrukturen, Oberflächenreaktionen, Teilchen und Cluster, Zeitaufgelöste Spektroskopie)
O 28.37: Poster
Mittwoch, 10. März 2004, 16:00–19:00, Bereich C
Infrared-optical properties of Cu nanoparticles on CaF2(111) — •Birgit Gehring, Andreas Priebe, and Annemarie Pucci — Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, D - 69120 Heidelberg
Using IR spectroscopy the growth of Cu nanoparticles on UHV-cleaved CaF2(111) was investigated in situ. Relative transmission spectra informed about the dynamic conductivity of the nanoparticle film and about the influence of the substrate temperature on the percolation threshold.
In the range from about 1000 cm−1 up to about 2500 cm−1 a relative transmission > 100 % was observed for Cu coverage below percolation, which corresponds to an anti-reflection effect. The magnitude of this effect depends on the growth temperature.
For certain average Cu thicknesses we exposed CO at a sample temperature of about 100 K. The CO adsorption on different Cu facets was studied by IR transmission spectroscopy. The morphology of the nanoparticle layer was verified with atomic force microscopy (AFM) ex situ. From the AFM pictures the particle density was estimated and the filling factor could be evaluated.