Study of Polypyrrole Films Modified With Copper and Silver Microparticles by Electrochemical Cementation Process

Abstract

Electroactive polypyrrole (PPy) films obtained under potentiostatic electropolimerization from aqueous solutions of pyrrole doped with sulfate (SO 4 2-) anions were modified by incorporation of copper (Cu) and silver (Ag) microparticles using electrochemical cementation process. The electrochemically deposited and dissolving processes metals (Cu and Ag) onto and from polypyrrole were investigated. The PPy-Cu and PPy-Ag electrodes were characterized by electrochemical techniques and scanning electron microscopy (SEM) analysis and the electrochemical response of these modified electrodes was compared to that of the unmodified polypyrrole electrode. The results indicate that two forms of metal, valence and elemental ones, can be formed on polypyrrole at a constant cathodic potential. However, only the valence metal can be left on polypyrrole at the anodic potential. The copper and silver particles interact with polypyrrole films involving a strong complex formation affecting its electrochemical behavior. Scanning electron microscopy measurements show that dendritic-like metal aggregates are formed on the film surface. The electrochemical experiments reveal that metal deposition on conducting polymer can be envisaged as an attractive method for the electrodes fabrication.

Electrochemical behavior of polypyrrol/AuNP composites deposited by different electrochemical methods: sensing properties towards catechol

“…Curves show the characteristic stepped shape of the potentiostatic polymerization: After a short induction period where diffusion controls the monomer oxidation, the current increased rapidly with time, where polymer started nucleating and growing on the electrode surface. Finally, the current reached a plateau coinciding with a continuous and gradual polymer growth [ 29 – 30 ]. The calculated charges are shown in Table 1 .…”

One-Pot Synthesis of Copper Iodide-Polypyrrole Nanocomposites

“…These two effects (morphological reproducibility and storage stability) create good preconditions for the employment of this ink for fabrication of ultimate functional devices, i.e., chemical sensors (see the next section). Remarkably, during incorporation of metals and metal-containing structures into the framework of conductive polymers, i.e., PPy, the electrical and thermal conductivity of the fabricated hybrids can be significantly improved [39]. To verify the electroactivity of the designed composites, the electrochemical response of CuI-PPy samples was evaluated in CV mode first in 0.5 M H 2 SO 4 under both, i.e., an inert gas and oxygen atmospheres.…”

Silver deposition on polypyrrole films electrosynthesised onto Nitinol alloy. Corrosion protection and antibacterial activity

“…The ability of PPy to reduce silver ions to metallic silver has been experimentally proved many times [16][17][18] and several assumptions about the silver deposition mechanism have been made [19,20].…”