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Journal article

Micro-drilling of polymer tubular ultramicroelectrode arrays for electrochemical sensors

In Sensors — 2013, Volume 13, Issue 5, pp. 6319-6333

By Kafka, Jan Robert1,2; Skaarup, Steen3,4; Geschke, Oliver5; Larsen, Niels Bent2,6

From

Surface Engineering, Department of Micro- and Nanotechnology, Technical University of Denmark1

Department of Micro- and Nanotechnology, Technical University of Denmark2

Physical and Biophysical Chemistry, Department of Chemistry, Technical University of Denmark3

Department of Chemistry, Technical University of Denmark4

Aquaporin A/S5

Polymer Microsystems for Cell Processing, Department of Micro- and Nanotechnology, Technical University of Denmark6

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.

Language: English
Publisher: Molecular Diversity Preservation International (MDPI)
Year: 2013
Pages: 6319-6333
ISSN: 14243210 and 14248220
Types: Journal article
DOI: 10.3390/s130506319
ORCIDs: Larsen, Niels Bent
Keywords

Drills Electrochemical electrodes Electrochemical sensors Finite element method Hydrogen peroxide Microelectrodes Peroxides Sensors

Other keywords

Chemical technology PEDOT TOPAS TP1-1185 electrochemical detection finite element modeling hydrogen peroxide, potassium ferro-/ferricyanide micro-drilling microfluidic system poly(3,4-ethylenedioxythiophene) tubular electrode ultramicroelectrode

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