• Britz, Dieter
• Strutwolf, Jörg

Abstract

Current-time and steady state current behaviour were simulated for an<br/>ultramicrodisk electrode (UMDE) inlaid flush with an insulating plane and<br/>overlaid by a flat film of polymer containing an enzyme, of various<br/>film thicknesses and essentially infinite extent. Steady state currents go<br/>through a maximum for some film thickness H, and then approach a<br/>constant value for thicker films. This constant value is the same as that for<br/>the diffusion limited current at an UMDE in a semi-infinite medium.<br/>Response times to 95% of the steady state current, for thin films are<br/>shorter than can be achieved using a flat disk electrode and a hemispherical polymer drop, but for large H they are slightly longer for<br/>comparable film thicknesses/radii. A hemispherical electrode under a<br/>hemispherical polymer drop, however, behaves much like the present<br/>arrangement.<br/>

Topics

• impedance spectroscopy
• polymer
• simulation
• chronoamperometry