Electrochemical Sensing with Spatially Patterned Pt Octahedra Electrodes

Author:

Jonker Dirk1,Eyovge Cavit1,Berenschot Erwin1,Di Palma Valerio2,Wasserberg Dorothee34,Michel‐Souzy Sandra3,Jonkheijm Pascal3,Krol Silke15,Gardeniers Han1,Creatore Mariadriana2,Tas Niels1,Susarrey‐Arce Arturo1ORCID

Affiliation:

1. Mesoscale Chemical Systems MESA+ Institute University of Twente Drienerlolaan 5 Enschede 7522 NB The Netherlands

2. Department of Applied Physics and Science of Education Eindhoven University of Technology Eindhoven 5600 MB The Netherlands

3. Department of Molecules and Materials Faculty of Science and Technology MESA+ Institute and TechMed Centre University of Twente P.O. Box 217 Enschede 7500 AE The Netherlands

4. LipoCoat B.V. Hengelosestraat 541 Enschede 7521 AG The Netherlands

5. Encytos B.V. Piet Heinstraat 12 Enschede 7511 JE The Netherlands

Abstract

AbstractLocally 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.

Funder

European Commission

Publisher

Wiley

Subject

Industrial and Manufacturing Engineering,Mechanics of Materials,General Materials Science

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