The electron paramagnetic resonance in copper-modified amorphous carbon
T. K. ZvonarevaIoffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg, 194021 RussiaV. I. Ivanov-OmskiĭSt. Petersburg State Technical University, St. Petersburg, RussiaB. P. PopovSt. Petersburg State Technical University, St. Petersburg, RussiaK. F. Shtel’makhSt. Petersburg State Technical University, St. Petersburg, Russia
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Room-temperature EPR spectra of copper-modified α-C:H films exhibit signals due to the isolated paramagnetic copper centers and dangling carbon bonds. An analysis of variation of the EPR signal intensity depending of the annealing temperature (T a≤300°C) and relaxation of the EPR and IR absorption signals upon annealing indicates that the annealing-induced modification of the α-C:H films involves hydrogen and oxygen impurities in the amorphous carbon matrix.
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