ZnCl2-induced changes in the electronic properties of polyaniline—HCl salt and its base

Transition Metal Salt Doping on Polypyrrole/MWCNT Composites for Supercapacitor Applications

“…À1 was due to the proton induced spin unpairing mechanism, results in additional charge delocalization on M-PPY-ZN composites. [11,13] Morphology Studies…”

Improving the electrochemical properties of polyaniline by co-doping with titanium ions and protonic acid

“…The conductivity of samples was measured at room temperature (25 • C) using the conventional four-probe method on compressed pellets of the powders [28].…”

“…This means that the titanium ions are always preferentially bonded with the imine nitrogen atoms. (2) The absorption peaks in the range of 3400-2800 cm −1 , usually called "H-peaks", are assigned to hydrogen bonding involving amines (-NH-) and protonated imines ( NH + ) between the regularly aligned polyaniline chains [28,39]. Fig.…”

“…The doping mechanism of metal ions depends on the metal electrode potential. For alkalimetal ions [9,15,16] or some transition-metal ions with relatively low electrode potential, such as Zn 2+ [16][17][18], the metal ions play the role of protons, and the metal ions predominantly coordinate with the imine nitrogen atoms of the quinoid groups in EB chains, leading to pseudo-protonation of the polymer backbone. On the contrary, some oxidative metal ions with relatively higher electrode potentials, for example Cu 2+ and Fe 3+ [18,19], may attack the amine nitrogen atoms of the benzenoid groups in the EB chains, leading the EB-to-PNB conversion.…”

Synthesis and Characterization of Novel Polyamines Containing Different Substitute Groups Via Chemical Oxidative Polymerization

“…6 The bands at 1474 and 1604 cm -1 are assigned to the stretching modes for the non-symmetric aromatic ring. The characteristic bands of N-H bending and the stretching modes of symmetric C-C (or C-N) are observed in the range of 1250-1300 cm -1 .…”