UV-Vis spectra of polyaniline doped with camphor sulfonic acid in different organic solvents

Abstract

gl3~ra~ The doping reaction of polyaniline with camphor sulfenic acid (CSAH) in different organic solvents was studied by UV-Vis speclrascopy. The experimental results show that the polaron band of the species was shifted to shorter wavelength when polyaniline was doped with CSAH in N-methyl-2-pyrrolidioue (NMP) solvent, while the red shift of polaron band was observed when it was in N, N-dimethylformamide (DMF). It indicates that the influence of different processing solvents on the doping property of polyaniline is greatly different. N-methyl-2-pyrrolidione is a good solvent for polyaniline, polyaniliue chain is unfolded in it. The interaction of NMP with CSAH is so strong that the resulting product is apt to dedoping, while the solubility of polyaniline in DMF is relatively low and polyaniline chain is in partly folded state. Thus the doping reaction is kinetically disadvantageous but thermodynamically advantageous.

Charge Transport through Functionalized Graphene Quantum Dots Embedded in a Polyaniline Matrix

“…In all the absorption profiles, we see five absorption bands peaking at 260, 320, 418, 632, and 870 nm, respectively. The band at 260 nm is the characteristic benzenoid band, whereas the one at 632 nm is because of the quinoid segment . The band peaking at 320 nm represents the reduced state, while the bands at 418 and 870 nm represent the oxidized states of the doped PANI .…”

“…The band at 260 nm is the characteristic benzenoid band, 42 whereas the one at 632 nm is because of the quinoid segment. 43 The band peaking at 320 nm represents the reduced state, while the bands at 418 and 870 nm represent the oxidized states of the doped PANI. 44 These two oxidized states correspond to two different polaron transitions  the band at 418 nm for the π*-polaron and the one at 870 nm for the π-polaron transitions.…”

Polymers in Solar Cells

“…In the UV-Vis spectrum of the aniline-thiophene-copolymer various absorption maxima could be observed: bencenic π-π* transitions at around 350 nm; π-π* transitions of the thiophene systems at 450 nm and quinoid transitions at about 700 nm. Additionally in the 650-800 nm range n-π* transitions could be detected that correspond to the transitions of non-bonding sp 2 nitrogen electrons present on quinoid ring systems [37].…”