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Deuteron Magnetic Resonance and Infrared Absorption Studies of Structure and Dynamics in Amorphous Hydrogenated Carbon and Carbon Nitride

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Abstract

Deuteron magnetic resonance (DMR) and infrared absorption spectra have been measured in amorphous hydrogenated carbon (a-C:H and a-C:D,H) and amorphous hydrogenated carbon nitride (a-CN:D,H) films plasma-deposited onto room-temperature substrates from feedstock mixtures of CH4, N2, and D2. DMR spectra and transient magnetization recoveries were measured between room temperature and 4 K. Recoveries are dominated by magnetization transport under extreme inhomogeneity. Methyl rotors CDx H3-x freeze out below 77 K. From the infrared absorption spectra, NH2, CHx, double bonded C-C, and triple bonded C-N stretching modes are observed. As a function of increasing nitrogen concentrations, the NH2 and C-N intensities dramatically increase while the CHx and C-C intensities decrease. In films where the ratio of nitrogen to carbon plus nitrogen is greater than 25%, the absorption spectra are dominated by NH2 stretching and bending modes; in contrast, the DMR spectra show many CDxHy configurations and a broader NDxHy structure. Proton NMR shows significant hydrogen clustering in a-CN:D,H.

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Authors and Affiliations

  1. Department of Physics and Center for Molecular Electronics, University of Missouri, St. Louis, MO, 63121, USA

    Shu-Han Lin & Bernard J. Feldman

  2. Department of Physics, Washington University, St. Louis, MO, 63130, USA

    J. R. Bodart, V. P. Bork, M. J. Kernan, P. A. Fedders & R. E. Norberg

Authors
  1. Shu-Han Lin
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  2. Bernard J. Feldman
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  3. J. R. Bodart
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  4. V. P. Bork
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  5. M. J. Kernan
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  6. P. A. Fedders
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  7. R. E. Norberg
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Lin, SH., Feldman, B.J., Bodart, J.R. et al. Deuteron Magnetic Resonance and Infrared Absorption Studies of Structure and Dynamics in Amorphous Hydrogenated Carbon and Carbon Nitride. MRS Online Proceedings Library 349, 489–494 (1994). https://doi.org/10.1557/PROC-349-489

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  • DOI: https://doi.org/10.1557/PROC-349-489

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