PREPARATION OF MICROARRAY ELECTRODES BY SONOCHEMICAL ABLATION OF POLYMER-FILMS

A new procedure for preparing arrays of microelectrodes based on sonoc hemical ablation of thin insulating polymer films on electrode surface s is described. Films are formed through the oxidative electropolymeri zation of o-phenylenediamine and micron-diameter holes subsequently bu rned through films by interfacial acoustic cavitation. Electrodes prep ared in this way exhibit steady-state currents in quiescent solution a nd yield lower detection limits than bare electrodes. This preparation procedure has the potential advantage of being scalable to prepare ar rays of arbitrary size.