Interpretation of infrared and Raman spectra of amorphous carbon nitrides
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- 9 April 2003
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 67 (15), 155306
- https://doi.org/10.1103/physrevb.67.155306
Abstract
A general framework for the interpretation of infrared and Raman spectra of amorphous carbon nitrides is presented. In the first part of this paper we examine the infrared spectra. The peaks around 1350 and 1550 found in the infrared spectrum of amorphous carbon nitride or hydrogenated and hydrogen-free amorphous carbon are shown to originate from the large dynamic charge of the more delocalized π bonding which occurs in more bonded networks. The IR absorption decreases strongly when the π bonding becomes localized, as in tetrahedral amorphous carbon. Isotopic substitution is used to assign the modes to skeleton modes, even those modes around 1600 which become strongly enhanced by the presence of hydrogen. The infrared spectrum of carbon nitride may resemble the Raman spectrum at some excitation energy, but the infrared activity does not primarily result from nitrogen breaking the symmetry. In the second part we examine the Raman spectra. A general model is presented for the interpretation of the Raman spectra of amorphous carbon nitrides measured at any excitation energy. The Raman spectra can be explained in terms of an amorphous carbon based model, without need of extra peaks due to CN, NN, or NH modes. We classify amorphous carbon nitride films in four classes, according to the corresponding N-free film: and We analyze a wide variety of samples for the four classes and present the Raman spectra as a function of N content, content, and band gap. In all cases, a multiwavelength Raman study allows a direct correlation of the Raman parameters with the N content, which is not generally possible for single wavelength excitation. The G peak dispersion emerges as a most informative parameter for Raman analysis. UV Raman enhances the CN peak, which is usually too faint to be seen in visible excitation. As for N-free samples, UV Raman also enhances the C-C bonds vibrations, allowing the content to be quantified.
Keywords
This publication has 85 references indexed in Scilit:
- Raman and infrared modes of hydrogenated amorphous carbon nitrideJournal of Applied Physics, 2001
- Electronic structure studies of undoped and nitrogen-doped tetrahedral amorphous carbon using high-resolution electron energy-loss spectroscopyJournal of Applied Physics, 2001
- Optical, electrical and mechanical properties of nitrogen-rich carbon nitride films deposited by inductively coupled plasma chemical vapor depositionThin Solid Films, 2000
- Influence of nitrogen and temperature on the deposition of tetrahedrally bonded amorphous carbonJournal of Applied Physics, 2000
- Interpretation of Raman spectra of disordered and amorphous carbonPhysical Review B, 2000
- Ultraviolet and visible Raman studies of nitrogenated tetrahedral amorphous carbon filmsThin Solid Films, 2000
- Electronic structure of hydrogenated carbon nitride filmsJournal of Vacuum Science & Technology A, 1998
- Tribological Behavior of Amorphous Carbon Nitride Overcoats for Magnetic Thin-Film Rigid DisksJournal of Tribology, 1996
- Influence of annealing on the hydrogen bonding and the microstructure of diamondlike and polymerlike hydrogenated amorphous carbon filmsPhysical Review B, 1995
- Optical Phonons and Dynamic Charge in Trigonal Se and TePhysical Review B, 1968