Abstract:

The surface coating of the nerve electrode has an important influence on the performance of the electrode, and the deposition process is an important influencing parameter. This paper focuses on the effect of coating deposition process on its electrical properties, and studies the wear resistance of the coating obtained by the best deposition process. Specifically, the advantages and disadvantages of the three polyaniline electrochemical deposition methods are compared under the premise of controlling the amount of charge passing through the electrodes during the deposition process. The results show that compared with the bare electrode, the impedance of the cyclic voltammetric deposition electrode decreases by 29.7% and the CV area increases by 4.05 times. The impedance of the constant current deposition electrode decreases by 39.8%, and the CV area increases by 5.4 times. The impedance of the constant potential deposition electrode decreases by 4.3% and CV area increases by 4.9 times. The constant current method works best. A lower impedance and larger CV area mean a better electrical performance. Under this standard, deposition is better while the deposition time of constant current is between 600 and 700 s. In order to investigate the effect of polyaniline coating on the performance improvement of the electrode after wear, this paper has designed a simulated internal wear device for related experiments. The results show that the electrical properties of the coating are gradually reduced during the wear process. After 4h of wear, the impedance of the modified electrode is even higher than that of the bare electrode. Therefore, the anti-wear properties of the coating should be taken into account in the evaluation of conductive coatings.

Key words: polyaniline, deposition method, deposition parameters, wear