We have developed polymeric stabilizers that produce concentrated nanocarbon dispersions in water (SWCNT, MWCNT, graphene, hydrothermal carbon) with significantly higher visible absorption coefficients than reported earlier [Ager et al, ACS Nano, 8, 11191 (2014)], but still falling short of apparent values reported by Geim et al. The dispersion process certainly causes various types of defects, but the difference we see in dispersion and single or few-layer graphene sheets in air (Geim et al) are still essentially a factor of 2 (smaller than reported by Geim et al). Has anyone examined the absorption coefficient theoretically for graphene as a function of graphene sheet area?
You may find some information https://www.researchgate.net/publication/261726044_DFT_study_of_optical_properties_of_pure_and_doped_Graphene
Article DFT study of optical properties of pure and doped Graphene
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