It is well known that emeraldine
base (EB) form of PANI can be rendered conductive by doping with a protonic acid.
The UV-Vis spectra show the characteristic bands of Pani in the emeraldine
"Polyaniline": Protonic acid doping of the emeraldine
form to the metallic regime.
In our previous work , different PAni states including nonconductive emeraldine
base (EB) and conductive emeraldine
salt (ES) were added to ZRP, to study the effects of different oxidation states on anticorrosive performance.
The Raman features of semiquinone radical structures typical for protonated emeraldine
salt are enhanced by near-infrared excitation; in contrast, the Raman features of quinonoid units typical for the PANI base are enhanced with a red excitation line .
The polyaniline was obtained in the emeraldine
base oxidation state by an interfacial synthesis followed by a chemical route to obtain the polyaniline nanofibers as reported by Huang and Kaner .
Temperini, "Studies on the interaction of emeraldine
base polyaniline with Cu(II), Fe(III), and Zn(II) ions in solutions and films," Macromolecules, vol.
Among those, nanocomposite of MNPs with polyaniline (emeraldine
base coating) has been extensively studied in syntheses and applications for medical and environment purposes.
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 0.18 V), the second transition is due to conversion of emeraldine
to Pernigraniline (at 0.57 V) which is nonconductive form of PANI [30, 31] after inoculation, the current responses of PANI -Au increases significantly, a strong oxidation current peak is observed indicating much higher electrochemical activity (Fig.
It is well known that PANI exists in three different oxidation states (leucoemeraldine, emeraldine
, and pernigraniline); only polyemeraldine is electrically conductive.
Since the deposition phase is performed using the emeraldine
base form of the polymer, 2 doping processes are necessary to complete the protonation of the PANI into its conductive form (emeraldine
(8.) Armelin, E, Aleman, C, Iribarren, JI, "Anticorrosion Performances of Epoxy Coatings Modified with Polyaniline: A Comparison Between the Emeraldine
Base and Salt Forms." Prog.