AC admittance and electrochemical studies of thin insulating films on metal electrodes immersed in electrolyte solutions

The advent of Biotechnology has created a need for novel sensors and for electrodes with specific electrocatalytic properties. One approach to developing such devices is to deposit on an electrode a thin, passive, insulating film containing active molecules for performing the sensing or catalytic operation. The active species will be chosen for its ability to undergo specific chemical or electron transfer reactions. Certain proteins are known to be very specific in their action and the immobilisation of such proteins on electrodes is now receiving much attention.