Resonant Raman scattering from polyacetylene and poly(p-phenylene vinylene) chains included into hydrogenated amorphous carbon

The resonant Raman scattering in N-IR–UV range from amorphous hydrogenated carbon (a-C:H) reveals inclusions of trans-polyacetylene [trans-(CH)x] chains with approximate length of up to 120 CC units and inclusions of poly(p-phenylene vinylene) (PPV) polymer chains. The PPV is evidenced by a strong dispersive mode at ~1175 cm−1. It was found that the Raman response from core Ag trans-(CH)x modes incorporated into a−C:H to changing excitation energy is identical to that of freestanding chains, thus facilitating identification of trans-(CH)x in complex carbonaceous materials spectra