The Effect of Redox Couple on Gold-Coated PCB Electrode

DOI

10.2991/978-94-6463-922-3_39How to use a DOI?

Keywords

PCB; Ferro- Ferri redox couple; Heaxaammine Ruthenium redox couple; Randles Seivick equation

Abstract

Printed Circuit Board (PCB) electrodes are promising tool for biosensing applications due to their low cost, minimal sample requirement, compact size, and suitability for mass production. In addition to these practical advantages, the electrochemical activity of the electrode PCB electrode surface ensuring reliable sensor performance. This study focusses the electrochemical behaviour of gold-coated PCB electrodes using two widely utilized redox couples: potassium ferro/ferricyanide and hexaammine ruthenium (III) chloride (HAR). Electrochemical study conducted by following Cyclic Voltammetry and Square Wave Voltammetry, revealed that electrodes treated with the ferro/ferricyanide redox couple exhibited notable variability in signal intensity across multiple trials. The surface characterization of the modified electrode was performed using Energy-Dispersive X-ray Spectroscopy (EDX) and X-ray Photoelectron Spectroscopy (XPS). These analyses showed a significant reduction in the gold weight percentage on the electrode surface after ferro/ferricyanide treatment, indicating surface degradation. In contrast, electrodes exposed to the HAR redox couple showed stable, reproducible signals with negligible surface alteration. This study evaluates gold-coated PCB electrodes for biosensing applications by comparing two redox probes: potassium ferro/ferricyanide and hexaammine ruthenium (III) chloride (HAR). Ferro/ferricyanide led to signal variability and surface degradation, confirmed by EDX and XPS, compromising sensor reliability. HAR, produced stable and reproducible electrochemical responses while preserving the gold surface, as verified through Randles–Sevcik analysis. These results establish HAR as a more suitable probe for gold PCB electrodes, ensuring durability and consistent performance in electrochemical biosensors.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - S. Syama
PY  - 2025
DA  - 2025/12/25
TI  - The Effect of Redox Couple on Gold-Coated PCB Electrode
BT  - Proceedings of the International Conference Recent Advances in Materials, Processes and Technology for Sustainability (RAMPTS 2025)
PB  - Atlantis Press
SP  - 584
EP  - 597
SN  - 2590-3217
UR  - https://doi.org/10.2991/978-94-6463-922-3_39
DO  - 10.2991/978-94-6463-922-3_39
ID  - Syama2025
ER  -