Carbon fiber microelectrodes modified with Nafion

Methods for coating cylindrical carbon fiber microelectrodes with Nafion films of different thickness have been developed. It has been shown that it is possible to form thicker Nafion layers on the microelectrodes by adding multiple coats. The charge required to oxidize methylviologen incorporated in Nafion films was used to estimate the average thickness of the Nafion films. The ion-exchange equilibrium between Nafion film and solution was established more rapidly on the microelectrodes 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 regeneration of the microelectrodes before the application of new coatings of Nafion.