The CV of PANI clearly indicates two redox transitions (C1/A1, C2/A2); one represents transition of PANI from neutral leucoemeraldine to conductive emeraldine
state (at 0.
It is well known that PANI exists in three different oxidation states (leucoemeraldine, emeraldine
, and pernigraniline); only polyemeraldine is electrically conductive.
Armelin, E, Aleman, C, Iribarren, JI, "Anticorrosion Performances of Epoxy Coatings Modified with Polyaniline: A Comparison Between the Emeraldine
Base and Salt Forms.
Oxidizing aniline via aqueous polymerization pathway is believed to produce polyaniline with a structure most resembling that of the idealized emeraldine
oxidation state; polyaniline produced in this fashion typically possesses a granular morphology of irregular shaped micron sized particles .
Due to its excellent environmental stability in the undoped as well as in the doped state, polyaniline in its oxidation state of emeraldine
is considered as a very promising material for many industrial applications.
These peaks show transformation of leucoemeraldine to emeraldine
to pernigeraniline states of the polymer .
Thus, the optical absorption spectroscopy reveals the formation of the emeraldine
salt (ES) form along with some other oxidation-state species.
The nonconducting emeraldine
base form of PANI and its derivatives can be converted into the partly protonated, highly conducting emeraldine
salt form simply by treating them with mineral acids .
Vibrational analysis of polyanilne A comparative study of leucoemeraldine, emeraldine
, and pernigraniline bases.
JP, "A Silane Pre-Treatment for Improving Corrosion Resistance Performances of ( Emeraldine
Base-Coated Aluminium Samples in Neutral Environment.
PANI has three basic structures, namely a fully reduced leucoemeraldine base (LEB), a fully oxidized pernigraniline base (PNB), and a half-oxidized/half-reduced emeraldine
base (EB) state.
The PAni can mainly occur in three forms, fully reduced leucoemeraldine, partially oxidized emeraldine
base, and fully oxidized pernigraniline.