Preparation and characterization of carbonaceous matter rich in diamond-like carbon and carbyne moieties

Abstract

The microstructure of carbonaceous matter prepared from copper acetylide, by a coupling reaction promoted by air, hydrogen peroxide or Cu(NH 3) n 2+ oxidation has been studied by solid state C 13-NMR (CP/MAS), FT-IR and Raman spectroscopy. All three spectral techniques give clear evidences that the solid carbon produced contains sp-hybridized carbon chain moieties known as `acetylenic carbyne' (polyene-type, IUPAC notation: polyethynylene). Solid state C 13-NMR (CP/MAS) provides additional evidence on the presence of small cumulenic moiety `allenic or cumulenic carbyne' (polycumulene-type, IUPAC notation polyethylenediylidene). Solid state C 13-NMR (CP/MAS) in conjunction with Raman spectroscopy show sp 3-hybridized carbon moieties known also as `diamond-like carbon', formed by a crosslinking reaction of acetylenic carbyne chains; additionally sp 2-hybridized carbon atoms were detected and assigned to amorphous and graphitic carbon.