沉积工艺对聚苯胺涂层电学性能的影响及其抗磨损性能

Effect of Deposition Process on Electrical Properties of Polyaniline Coating and Its Wear Resistance

神经电极表面涂层对电极性能有重要影响,其中沉积工艺是重要的影响参量.本文着重考察涂层沉积工艺对其电学性能的影响,并对最佳沉积工艺所得涂层的抗磨损性能进行研究.具体而言,在控制沉积过程中电极通过电荷量相当的前提下,比较3种聚苯胺电化学沉积方法的优劣.结果显示:相比裸电极,循环伏安沉积电极阻抗降低了29.7%,CV面积增加了4.05倍;恒电流沉积电极阻抗降低了39.8%,CV面积增加了5.4倍;恒电位沉积电极阻抗降低了4.3%,CV面积增加了4.9倍,恒电流法效果最佳.较低的阻抗及较大的CV面积意味着较好的电学性能.在此标准下,恒电流沉积时间为600~700 s时,沉积效果较好.为考察聚苯胺涂层磨损后对电极性能改善效果的影响,设计了一种模拟体内磨损装置进行相关试验.结果显示:磨损过程中涂层的电学性能改善效果逐渐下降,经4 h磨损后,修饰电极的阻抗值甚至高于裸电极阻抗.因此,在对导电涂层的评估中,其抗磨损性能应引起重视.

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 4 h 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.