Cluster Structure of Diamond-Like Carbon Films
УДК 539.234
Abstract
The paper studies the structure of thin diamond-like carbon films using transmission electron microscopy and Raman spectroscopy. Carbon films are condensed on carbon substrates from vapors produced by evaporation of a graphite target with a defocused 1064 nm laser beam. The electron microscopy data indicates the uniformity of the cluster distribution. The interplane distances calculated from the reflections (111) and (220) reveal the crystal structures of the clusters to be diamond-like but strongly distorted. There are no electron reflections detected from graphite-like clusters. On the contrary, Raman spectra indicate the presence of graphite clusters, but not the diamondlike clusters. Graphite clusters are identified using characteristic G- and D-lines (bands). The G-band is associated with the ideal lattice of a graphite cluster, while the D-band is associated with the distorted and disordered crystal lattice of a graphite-like cluster. The absence of a diamond line is due to the small size of the clusters, which leads to the appearance of phonon modes with wave vectors q in the range 0<q<1/L (L is the size of the diamond-like cluster). Thus, the zero phonon energy is redistributed between the phonon modes, i.e., the broadened diamond line is hidden in the low-frequency "tail" of the D-band.
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References
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Copyright (c) 2025 Владимир Александрович Плотников, Сергей Викторович Макаров, Евгения Владимировна Кустова, Ольга Сергеевна Мельникова
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