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Alkali-Metal Containing Amorphous Carbon: Reactivity and Electronic Structure

Published online by Cambridge University Press:  10 February 2011

M. Töwe,
P. Reinke and
P. Oelhafen
M. Töwe
Affiliation:
Institut für Physik der Universität Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
P. Reinke
Affiliation:
Institut für Physik der Universität Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
P. Oelhafen
Affiliation:
Institut für Physik der Universität Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
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Abstract

Amorphous hydrogen-free carbon films (sp2-dominated a-C) were deposited under ultrahigh vacuum conditions between room temperature and 800°C. These films served as matrices for the in-situ incorporation of alkali-metal atoms (Li, Na). In-situ sample characterization was performed by photoelectron spectroscopy with both x-ray and ultraviolet excitation (XPS, UPS). While the clean metal-containing samples were prepared with metal contents of about 10 at%, a strong oxidation driven accumulation of metal atoms on the film surface exceeding 50 at% was observed upon exposure to molecular oxygen. Work-function measurements by UPS reflected the changes within the electronic structure of the material. Metal incorporation considerably decreased the work-function, but only after oxidation we observed work-functions below the values given for pure alkali metals.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 593: Symposium U – Amorphous & Nanostructured Carbon , 1999, 167
Copyright
Copyright © Materials Research Society 2000

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References

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