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ESR Of Graphite-Like Amorphous Carbon Thin Film In The 20 – 340 K Temperature Range

Published online by Cambridge University Press:  26 February 2011

Gustavo A. Viana  and
Francisco C. Marques
Gustavo A. Viana
Affiliation:
gviana@ifi.unicamp.br, UNICAMP, Instituto de Física Gleb Wataghin, Cidade Universitária Zeferino Vaz, 13083-970 - Campinas, 6165, Brazil>
Francisco C. Marques
Affiliation:
marques@ifi.unicamp.br, UNICAMP, Instituto de Física Gleb Wataghin, Cidade Universitária Zeferino Vaz, 13083-970 - Campinas, 6165, Brazil
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Abstract

Electron spin resonance of graphite-like a-C thin films is investigated in the 20 K up to 340 K temperature range. The films with sp2 concentration of about 90 % (determined by electron energy loss spectroscopy), with no measurable optical band gap, were prepared by ion beam assisted sputtering. The results revealed an unexpected low density of paramagnetic centers, ascribed to itinerant states (conduction electrons) and not to localized states usually reported for a-C with band gap higher than 1.0 eV.

Keywords

amorphouselectron spin resonanceC
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 984: Symposium MM – Magnetic Resonance in Material Science , 2006 , 0984-MM15-01
Copyright
Copyright © Materials Research Society 2007

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