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4-(3-(4-((4-nitrophenyl)azo)phenyloxy)propyl)aminobenzene sulfonic acid
(C3-ABSA) was designed and synthesized as a novel dopant of polyaniline (PANI).
Structural characterization by FTIR, 1H NMR and Second Ion Mass Spectrum (SIMS)
showed that C3-ABSA has a molecular formula of C21H20N4O6S.
Nanostructural PANI
(e.g. nanorod or nanotube) was synthesized by a template-free method in the
presence of C3-ABSA as a dopant. It was found that the size and room-temperature
conductivity of the resulting PANI- (C3-ABSA) strongly depend on the synthetic
conditions, in particular, nanotubes or nanorods with 50~300 nm in diameter and
room-temperature conductivity of 1.1 S/cm were obtained when water (1.0 mL) was
added before polymerization. It was proposed that C3-ABSA plays a "template-like"
role in forming PANI- (C3-ABSA) nanostructures due to surfactant function of
C3-ABSA. The molecular structures were characterized by FTIR, UV-Vis. absorption
and X-ray diffraction, showing the main chain and electronic structure are
identical to the doped PANI, but exhibit partial crystallinity.
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