The D- and G-branches associated with the Raman spectrum of thin-film carbon

Abstract

For thin-film carbon’s Raman spectrum, we introduce the concept of D- and G-branches, these branches being related to the D- and G-peaks, respectively, shoulders and onsets associated with each of these branches being defined. Drawing upon a library of Raman spectra representative of the diversity of thin-film carbon’s genome, we find that while the D-branch shoulder and onset associated with thin-film carbon exhibit a fair amount of dispersion across the thin-film carbon genome, the G-branch shoulder and onset are found to be relatively uniform. Variations in the D-branch and the G-branch shoulders and onsets within the various thin-film carbon groupings identified by Ferrari and Robertson (2000) are explored. It is suggested that perhaps the thin-film carbon groupings of Ferrari and Robertson should be revised.