CARBON-FIBER MICROELECTRODES MODIFIED WITH NAFION

Methods for coating cylindrical carbon fiber microelectrodes with Nafi on films of different thickness have been developed. It has been shown that it is possible to form thicker Nafion layers on the microelectro des by adding multiple coats. The charge required to oxidize methylvio logen incorporated in Nation films was used to estimate the average th ickness of the Nafion films. The ion-exchange equilibrium between Nafi on film and solution was established more rapidly on the microelectrod es by cylindrical diffusion in the solutions and thicker Nafion films. A procedure for the desorption of viologen and dissolution of Nafion films on microelectrodes has been developed. Their use resulted in reg eneration of the microelectrodes before the application of new coating s of Nafion.