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Electronic States of Nanocrystalline Carbon

Published online by Cambridge University Press:  15 February 2011

G. P. Lopinski ,
V. I. Merkulov  and
J. S. Lannin
G. P. Lopinski
Affiliation:
Dept. of Physics, Penn State University, University Park, PA 16802
V. I. Merkulov
Affiliation:
Dept. of Physics, Penn State University, University Park, PA 16802
J. S. Lannin
Affiliation:
Dept. of Physics, Penn State University, University Park, PA 16802
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Abstract

Electron energy loss spectroscopy (EELS) has been used to investigate the electronic states of isolated, nanocrystalline carbon particles. Small carbon nanocrys-tals were prepared via sputter deposition onto SiO2 substrates, followed by annealing to 700C. The structure and size distribution of the particles have been characterized by Raman scattering, Auger electron spectroscopy and electron microscopy. EELS observations indicate that a semimetal to semiconductor transition occurs for particles smaller than lnm. In addition, hydrogen adsorption is found to significantly affect the electronic states of these particles, indicating that both finite size and dangling bond effects modify the properties of small carbon nanocrystallites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 452 , 1996 , 215
Copyright
Copyright © Materials Research Society 1997

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Footnotes

*

Present address: Steacie Institute for Molecular Sciences, National Research Council, 100 Sussex Dr., Ottawa, Ontario, Canada KlA 0R6.

References

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