Kafka, Jan Robert2; Skaarup, Steen4; Geschke, Oliver7; Larsen, Niels Bent2
1 Surface Engineering, Department of Micro- and Nanotechnology, Technical University of Denmark2 Department of Micro- and Nanotechnology, Technical University of Denmark3 Physical and Biophysical Chemistry, Department of Chemistry, Technical University of Denmark4 Department of Chemistry, Technical University of Denmark5 Polymer Microsystems for Cell Processing, Department of Micro- and Nanotechnology, Technical University of Denmark6 Aquaporin A/S7 Aquaporin A/S
We present a reproducible fast prototyping procedure based on micro-drilling to produce homogeneous tubular ultramicroelectrode arrays made from poly(3,4-ethylenedioxythiophene) (PEDOT), a conductive polymer. Arrays of Ø 100 μm tubular electrodes each having a height of 0.37 ± 0.06 μm were reproducibly fabricated. The electrode dimensions were analyzed by SEM after deposition of silver dendrites to visualize the electroactive electrode area. The electrochemical applicability of the electrodes was demonstrated by voltammetric and amperometric detection of ferri-/ferrocyanide. Recorded signals were in agreement with results from finite element modelling of the system. The tubular PEDOT ultramicroelectrode arrays were modified by prussian blue to enable the detection of hydrogen peroxide. A linear sensor response was demonstrated for hydrogen peroxide concentrations from 0.1 mM to 1 mM.