Electrochemical Sensing with Spatially Patterned Pt Octahedra Electrodes

Dirk Jonker*, Cavit Eyovge, Erwin Berenschot, Valerio Di Palma, Dorothee Wasserberg, Sandra Michel-Souzy, Pascal Jonkheijm, Silke Krol, Han Gardeniers, Mariadriana Creatore, Niels Tas*, Arturo Susarrey-Arce*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Locally controlling the position of electrodes in 3D can open new avenues to collect electrochemical signals in complex sensing environments. Implementing such electrodes via an electrical network requires advanced fabrication approaches. This work uses corner lithography and Pt ALD to produce electrochemical 3D electrodes. The approach allows the fabrication of (sub)micrometer size Pt octahedra electrodes spatially supported over 3D fractal-like structures. As a proof of concept, electrochemical sensing of ferrocyanide in biofouling environments, e.g., bovine serum albumin (BSA) and Pseudomonas aeruginosa (P. aeruginosa), is assessed. Differences between before and after BSA addition show a reduction in the active electrode surface area (ΔAeff) ≈49% ± 7% for the flat electrode. In comparison, a ΔAeff reduction of 25% ± 2% for the 3D electrode has been found. The results are accompanied by a 24% ± 16% decrease in peak current for the flat Pt substrate and a 14% ± 5% decrease in peak current for the 3D electrode 24 h after adding BSA. In the case of P. aeruginosa, the 3D electrode retains electrochemical signals, while the flat electrode does not. The results demonstrate that the 3D Pt electrodes are more stable than their flat counterparts under biofouling conditions.

Original languageEnglish
Article number2300878
Number of pages10
JournalAdvanced Materials Technologies
Volume9
Issue number5
Early online date9 Jan 2024
DOIs
Publication statusPublished - 4 Mar 2024

Keywords

  • UT-Hybrid-D
  • electrochemistry
  • fabrication
  • platinum
  • sensing
  • 3D electrodes

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