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

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Jager, C. ; Gottwald, J. ; Spiess, H.W. ; Newport, Robert J. (1994)
  • Publisher: American Physical Society
  • Related identifiers: doi: 10.1103/PhysRevB.50.846
  • Subject: Q
    arxiv: Condensed Matter::Strongly Correlated Electrons

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.
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