Abstract
Results of spectroscopic measurements of three types of highly conducting polyacetylene are presented. A comparison is made of the traditional Shirakawa (or S-(CH)
x
), Naarmann (or N-(CH)
x
) and Tsukamoto (or
v-(CH)
x
) polyacetylenes. The non-conducting undoped materials have been characterized by
13
C CPMAS NMR. FT-IR and resonance Raman scattering. A higher conductivity for iodine-doped N- (CH)
x
and
v-(CH)
x
) in comparison with S-(CH)
x
is observed even though a greater sp
3 content is found in N-(CH)
x
and
v-(CH)
x
films. Since the sp
3 hybridized carbons may belong to catalyst residues, the sp
3 content does not correlate with conductivity. On the other hand, it is shown from the resonance Raman scattering data that a longer average conjugation length in N-(CH)
x
and
v-(CH)
x
may correlate with the higher conductivities of the iodine-doped films.