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Sensors 2013, 13(5), 6319-6333; doi:10.3390/s130506319
Article

Micro-Drilling of Polymer Tubular Ultramicroelectrode Arrays for Electrochemical Sensors

1
,
2
,
3
 and
1,*
1 Department of Micro- and Nanotechnology, DTU Nanotech, Technical University of Denmark, Ørsteds Plads, Building 345Ø, DK-2800 Kongens Lyngby, Denmark 2 Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 206, DK-2800 Kongens Lyngby, Denmark 3 Aquaporin A/S, Ole Maaløes Vej 3, DK-2200 Copenhagen N, Denmark
* Author to whom correspondence should be addressed.
Received: 12 March 2013 / Revised: 3 May 2013 / Accepted: 7 May 2013 / Published: 14 May 2013
(This article belongs to the Special Issue Novel Tools in Electrochemical Sensing)
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Abstract

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.
Keywords: micro-drilling; PEDOT; poly(3,4-ethylenedioxythiophene); tubular electrode; ultramicroelectrode; TOPAS; microfluidic system; electrochemical detection; hydrogen peroxide, potassium ferro-/ferricyanide; finite element modeling micro-drilling; PEDOT; poly(3,4-ethylenedioxythiophene); tubular electrode; ultramicroelectrode; TOPAS; microfluidic system; electrochemical detection; hydrogen peroxide, potassium ferro-/ferricyanide; finite element modeling
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kafka, J.; Skaarup, S.; Geschke, O.; Larsen, N.B. Micro-Drilling of Polymer Tubular Ultramicroelectrode Arrays for Electrochemical Sensors. Sensors 2013, 13, 6319-6333.

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