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

Abstract

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. © 2008 American Institute of Physics.