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13C NMR Spectroscopy of Amorphous Hydrogenated Carbon and Amorphous Hydrogenated Boron Carbide

Published online by Cambridge University Press:  10 February 2011

Janet Braddock-Wilking ,
Shiu-Han Lin  and
Bernard J. Feldman
Janet Braddock-Wilking
Affiliation:
Departments of Chemistry and Physics and the Center for Molecular Electronics University of Missouri-St. Louis, St. Louis, MO 63121
Shiu-Han Lin
Affiliation:
Departments of Chemistry and Physics and the Center for Molecular Electronics University of Missouri-St. Louis, St. Louis, MO 63121
Bernard J. Feldman
Affiliation:
Departments of Chemistry and Physics and the Center for Molecular Electronics University of Missouri-St. Louis, St. Louis, MO 63121
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Abstract

We report the 13C NMR spectra of amorphous hydrogenated carbon and boron carbide. The amorphous hydrogenated carbon spectra consist primarily of a sp2 carbon peak at 40 ppm and a sp3 carbon peak at 140 ppm and are in reasonable agreement with recent theoretical calculations of Mauri, Pfrommer, and Louie, but there are some noteable discrepancies. The amorphous hydrogenated boron carbide spectra are very different from that of amorphous hydrogenated carbon, showing two sharp lines at 135 and 170 ppm at low boron concentrations and an intense, broader line at 15 ppm at high boron concentrations. We suggest the two sharp lines at 135 and 170 ppm could be due to carbon atoms in boron-containing aromatic rings, and the broader line at 15 ppm as due to carbon atoms in boron carbide icosahedra. These lines provide evidence of nanocrystalline structure imbedded in an amorphous hydrogenated boron carbide matrix.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 555: Symposium OO – Properties and Processing of Vapor-Deposited Coatings , 1998 , 401
Copyright
Copyright © Materials Research Society 1999

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