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Dieter Britz

Digital simulation of chronoamperometry at a disk electrode under a flat polymer film containing an enzyme

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  • Dieter Britz
  • Jörg Strutwolf, Universität Tübingen, Germany
Current-time and steady state current behaviour were simulated for an
ultramicrodisk electrode (UMDE) inlaid flush with an insulating plane and
overlaid by a flat film of polymer containing an enzyme, of various
film thicknesses and essentially infinite extent. Steady state currents go
through a maximum for some film thickness H, and then approach a
constant value for thicker films. This constant value is the same as that for
the diffusion limited current at an UMDE in a semi-infinite medium.
Response times to 95% of the steady state current, for thin films are
shorter than can be achieved using a flat disk electrode and a hemispherical polymer drop, but for large H they are slightly longer for
comparable film thicknesses/radii. A hemispherical electrode under a
hemispherical polymer drop, however, behaves much like the present
arrangement.
Original languageEnglish
JournalElectrochimica Acta
Volume152
Pages (from-to)302-307
Number of pages6
ISSN0013-4686
DOIs
Publication statusPublished - 2015

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