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Morphology of Ultra-Thin Metal Films Using Infrared Reflection Adsorption Spectroscopy

Published online by Cambridge University Press:  25 February 2011

J.-W. He ,
W. K. Kuhn  and
D. W. Goodman
J.-W. He
Affiliation:
Chemistry Department, Texas A&M University, College Station, TX 77843–3255.
W. K. Kuhn
Affiliation:
Chemistry Department, Texas A&M University, College Station, TX 77843–3255.
D. W. Goodman
Affiliation:
Author to whom correspondence should be addressed
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Abstract

The adsorption of carbon monoxide on ultra-thin films of Cu, Ni and Co on Rh(100) and Mo(110) substrates has been studied using infrared reflection absorption spectroscopy (IRAS). The CO vibrational frequency on Cu/Rh(100) and Cu/Mo(110) at low Cu coverage (∼0.1 ML) shows a blue-shift relative to its gas phase stretching frequency (2143 cm−1). This blue-shift is explained as arising from CO adsorbed on well-dispersed Cu adatoms which are either slightly positively charged due to charge transfer from Cu to the substrate or self-polarized because of a strong Cu-substrate interaction. It is further shown that three-dimensional Cu clusters, well-ordered pseudomorphic two dimensional Cu islands and single Cu atoms are distinctively characterized by the CO IR peaks at 2074 cm−1, 2095 cm−1, and 2162 cm−1, respectively. In addition, it is found that IR spectra of CO adsorbed on Ni/Mo(110) show a remarkable sensitivity to surface structural phase transitions at the Ni-Mo interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 202: Symposium C – Evolution of Thin Film and Surface Microstructure , 1990 , 325
Copyright
Copyright © Materials Research Society 1991

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References

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