A new insight was watched the connection between’s the conductivity and Fourier Transform Infrared (FT-IR) spectra of the emeraldine type of polyaniline (PANI) structures. The conductivity of polyaniline emeraldine salt (PANI-ES) can be varied from 101 to 10-12 S cm-1. FT-IR spectrum is a tool to determine the conductivity level and also conductivity measuring methods of PANI system, i.e., either two probe or four probe techniques. This information is very useful for the researcher and industrialists working on emeraldine form of PANI systems to identify the conductivity level and method of measurements from FT-IR spectra. This data was seen from the infrared spectra of different PANI salts obtained by the oxidation of aniline in water/solvent medium by ammonium persulfate (APS) without utilizing any acids. PANI-ES samples having reasonably good conductivity (> 0.3 S cm-1) showed mostly nanowires or nanorods morphology, whereas, lower conductivity (< 0.3 S cm-1) samples showed mostlyagglomerated spheres or particles morphology. In these investigations, however, no report was made of the use of infrared technic to determine the conductivity of PANI system.

In this study, to make a stable electrode material for a supercapacitor, we selected a polyaniline and titanium dioxide (TiO2) hybrid material. Peroxotitanium acid was used to oxidize aniline in the presence of sulfuric acid to a poly(aniline sulfate) salt–titanium oxide composite in one step. IR, X‐ray diffraction, and energy dispersive X‐ray analysis (EDAX) analyses supported the formation of the composite. The poly(aniline sulfate) salt–titanium oxide composites (50 wt % each) showed an amorphous, flakelike morphology having a conductivity value of 8 × 10−3 S/cm with an excellent yield and stability (300°C).This composite material in the cell configuration showed a specific capacitance of 320 F/g at a 0.33 A/g discharge current density. Thirty thousand charge–discharge (CD) cycles at a heavy CD current density of 3.3 A/g were carried out on the supercapacitor cell. The values of equivalent series resistance (ESR) (8–9 Ω) and efficiency (100–98%) were found to be independent of the cycle number with an excellent retention capacity of 83%. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41711.

Polyaniline salts are being prepared with the use of acids by the oxidation of aniline using ammonium persulfate. Aim of this work is to avoid the use of acids in the preparation of polyaniline salt, which is acidic in nature. The synthesis was carried out by the oxidation of ammonium persulfate in presence of alcohol, β-naphthol, without using any acids. This novel polyaniline salt contains dual dopants of β-naphthol and sulfuric acid. Sulfuric acid group was generated from ammonium persulfate during the oxidation of aniline. This synthesis proce dure gave nano sized fiber form of polyaniline salt having crystalline nature with optoelectronic and fluorescence property.