Structural-Properties Of Amorphous Hydrogenated Carbon .3. NMR Investigations

Jager, C. and Gottwald, J. and Spiess, H.W. and Newport, Robert J. (1994) Structural-Properties Of Amorphous Hydrogenated Carbon .3. NMR Investigations. Physical Review B: Condensed Matter and Materials Physics, 50 (2). pp. 846-852. ISSN 0163-1829. (doi: ) (Full text available)

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Our NMR studies give experimental evidence of bonding heterogeneity in samples of a-C:H on the nanometer scale. Two classes of protons were identified with distinctly different spin-lattice-relaxation behavior. The difference in the spin-lattice relaxation provides a means of spectral editing of cross-polarization magic-angle spinning, combined rotation and multiple-pulse spectroscopy, dipolar dephasing spectra, and multiple quantum NMR experiments. This combination of the various NMR techniques allows for a detailed structural investigation of a-C:H, e.g., the sp2:sp3 ratio, the relative amount of hydrogenated and nonhydrogenated carbons, etc. A model incorporating the heterogeneity is established and discussed. The NMR results are compared with neutron spectroscopy and diffraction data.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: J.M. Smith
Date Deposited: 13 May 2009 14:33 UTC
Last Modified: 03 Jun 2014 08:13 UTC
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