Stability study of conducting polypyrrole films and polyvinylchloride-polypyrrole composites doped with different counterions

Chemical Reactivity of Polypyrrole and Its Relevance to Polypyrrole Based Electrochemical Sensors

“…The slower conductivity decrease observed for organic ions has been ascribed to water (and reactants soluble in water) repelling properties of hydrophobic organic ions. For p-toluenesulfate a slight initial conductivity increase has been ascribed to decrease in the solvent contents of the film [137]. Conductivity decrease in time is also faster for chemically synthesized polypyrrole, compared to electrochemically obtained polymer [143].…”

“…Even more complicated forms of conductivity vs. time dependences, additionally changing in different time ranges have been proposed [124,136,140,142]. The conductivity decrease in time is faster for the polymer doped by small inorganic anions than for polypyrrole doped by bulky organic ions, e.g., dodecylsulfate, dodecylbenzenesulfonate, poly(p-styrenesulfonate), 2-naphthylsulfonate, 2,6-naphthalenesulfonate [145] or p-toluenesulfonate ions [123,137,145]. The slower conductivity decrease observed for organic ions has been ascribed to water (and reactants soluble in water) repelling properties of hydrophobic organic ions.…”

Polypyrrole‐Fe3O4 Magnetic Nanocomposite Prepared by Ultrasonic Irradiation

“…[21,22] The conductivities of PPY/Fe 3 O 4 composite decrease to 64-84% of the initial conductivities for 30 d. The conductivity of PPY/Fe 3 O 4 composite decreases because the oxidation of the polymer backbone reduces the conjugation length of PPY. [22][23][24] …”

Characteristics of vibration modes of polypyrrole on surface-enhanced Raman scattering spectra

“…Generally, films synthesized by electrochemical polymerization have the advantages of higher conductivity and air stability [14][15][16]. Furthermore, many factors can influence the physical and spectroscopic properties of PPy [11,[17][18][19][20][21], including the nature of solvents and supporting electrolytes employed in preparation, whether the PPy is in the oxidized or reduced state, the pH in solution, as well as the monomer and electrolyte concentrations. Also, the procedure in treating PPy with water after its preparation to remove monomers and supporting electrolytes, can change its properties.…”