Abstract
A comparative analysis of modification of Raman spectra of hydrogenated amorphous carbon films containing encapsulated cobalt nanocrystals, their EM radiation losses and distribution function of nanosized fragments of graphene flatness constituting skeleton of amorphous carbon is performed. For this purpose, a model of confinement of graphene phonons by its fragments is developed, for two types of phonons contributing to the D and G peaks of Raman spectra, as a function of Co content.
Highlights
Metal nanoclusters are promising materials for creation on their basis magnetic media for ultra-high density recording [1] and EM absorbers [2]
First developed in [4], nanoclusters are embedded into a matrix of amorphous carbon [4, 5]
In paper [7] modification of hydrogenated amorphous carbon with Co was performed by Raman spectroscopy that allows one to estimate mean size of graphene fragments
Summary
Metal nanoclusters are promising materials for creation on their basis magnetic media for ultra-high density recording [1] and EM absorbers [2]. As one might expect for a relatively low concentration, Co atoms are stochastically scattering in the film and may interact with sp constituent of the matrix not forming massive Co clusters. This sp constituent consists of a set of grapheme plane fragments either embedded in an amorphous matrix and isolated from each other by spaces of amorphous material (sp3 -bonded) or even forming a network percolating through the sample. The valuable property of graphene fragments is the possibility to adsorb atoms that may occupy places above and below the planes These atoms may form two-dimensional fragments of metallic surfaces that may absorb electromagnetic radiation. In this paper we revise the dependence of the microwave radiation losses on overall Co concentration for Co-modified films of a-C:H aiming explanation of this dependence
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