Studies of PANI protonation in fluorinated alcohols are presented.
Three solvents have
been tested, namely 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP),
1,1,1,3,3,3-hexafluoro-2-phenyl-2-propanol
(HFPP), and 1,1,1,3,3,3-hexafluoro-2-(p-tolyl)-propanol
(HFTP). It has been demonstrated that the degree
of the broadening of the NIR absorption, which can be considered as a
measure of polaron delocalization,
depends strongly on the selection of an appropriate protonating
agent−solvent couple. Several couples,
giving spectra similar to that reported for
PANI(CSA)0.5 in m-cresol, have been found.
Processing of
PANI from HFIP solutions leads to films with improved PANI chains
stacking order as evidenced by
X-ray diffraction studies. The films exhibit metallic type of
conductivity down to 200 K. The temperature
dependence of the conductivity over the whole temperature range studied
has been fitted using a
combination of a metallic and hopping contribution in the frame of a
heterogeneous disorder picture of
PANI.
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