Screen Printed Electrodes Prussian Blue Deposition Process
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Solution Overview
Problem
Existing methods for modifying screen printed electrodes with Prussian blue are laborious, lack reproducibility, and are not suitable for large-scale production due to electrochemical deposition challenges, particularly with the flat shape of these electrodes and the need for electrochemical pre-treatment, which complicates the deposition process and affects the stability and reproducibility of the Prussian blue layer.
Innovation Solution
A process involving sequential deposition of Iron (III) or Iron (II) ions and ferrocyanide (II) or ferricyanide (III) ions with surface-active agents in appropriate solvents directly on the surface of screen printed electrodes, eliminating the need for electrochemical pre-treatment and allowing for a high-density, reproducible Prussian blue layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrochemical deposition is used to deposit Prussian blue on screen printed electrodes, then a Prussian blue layer can be formed on the electrode surface, but the process becomes laborious and unsuitable for large-scale production due to the need for electrochemical pre-treatment and manual deposition
Solution Approach 1:
The patent replaces the electrochemical deposition system with a chemical deposition system. Instead of using electrochemical cells, power supplies, and pre-treatment circuits, the invention uses a simple chemical solution containing ferric chloride and potassium ferricyanide that directly reacts on the screen printed electrode surface to form Prussian blue. This substitution eliminates all electrochemical equipment and complex procedures while maintaining reliable Prussian blue layer formation.
Solution Approach 2:
The screen printed electrode itself serves as the reaction substrate without requiring external electrochemical pre-treatment. The chemical solution is applied directly to the electrode, and the Prussian blue forms in situ through chemical reaction. The electrode's own structure and materials enable the deposition process without needing separate pre-treatment steps, making the process self-sufficient and suitable for automated production.
2Manufacturing precision
If electrochemical pre-treatment is performed on screen printed electrodes, then the response and reproducibility of the electrode are improved, but the production process becomes very laborious and time-consuming
Solution Approach 1:
The patent replaces the time-consuming electrochemical pre-treatment system with a rapid chemical deposition system. The chemical solution containing ferric chloride and potassium ferricyanide reacts directly with the screen printed electrode materials to form Prussian blue within seconds or minutes, eliminating the need for prolonged electrochemical pre-treatment cycles and enabling high-throughput production.
Solution Approach 2:
The screen printed electrode is manufactured with pre-configured conductive traces and reactive surfaces that are ready for direct chemical deposition. The electrode structure itself is prepared in advance during screen printing to facilitate immediate chemical reaction with the Prussian blue solution, eliminating the need for separate pre-treatment steps and reducing overall process time.
3Ease of manufacture
If manual deposition of Prussian blue mixture is performed, then the electrode can be modified, but the internal resistance of the system increases and the process lacks reproducibility
Solution Approach 1:
The patent replaces manual, imprecise deposition techniques with a controlled chemical deposition system. The chemical solution is applied in a standardized manner (e.g., through dipping, spraying, or dropping) and reacts uniformly across the electrode surface, ensuring consistent Prussian blue layer formation. This eliminates the variability and resistance issues associated with manual deposition while maintaining simplicity.
Solution Approach 2:
The patent optimizes the chemical solution parameters (concentrations of ferric chloride and potassium ferricyanide, pH, temperature) to ensure rapid and uniform Prussian blue formation. By controlling these chemical parameters, the process achieves high reproducibility and forms uniform layers without increasing internal resistance, while maintaining ease of manufacture through simple solution application.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process results in highly reproducible and stable electrodes with enhanced catalytic activity and long-term stability, suitable for scalable production of biosensors for analyte determination in biological fluids, offering improved performance and ease of automation compared to previous methods.
Implementation Method 1
A process involving sequential deposition of Iron (III) or Iron (II) ions and ferrocyanide (II) or ferricyanide (III) ions with surface-active agents in appropriate solvents directly on the surface of screen printed electrodes
Implementation Method 2
Iron (III) or Iron (II) ions and ferrocyanide (II) or ferricyanide (III) ions with surface-active agents in appropriate solvents
Implementation Method 3
Prussian blue can be deposited in layers on electrodes of different materials such as platinum, vitreous carbon, SnO 2 and TiO 2, and has a catalytic effect in reduction of the hydrogen peroxide produced during the enzymatic oxidisation of the analyte
Data Source
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AI summary
A process is described for the preparation of modified electrodes useful for the measurement of analytes in biological fluids, comprising the deposition of Prussian blue on screen printed electrodes, and the modified electrodes prepared via said process; the enzymatic electrodes and the biosensors comprising said modified electrodes and the method for the determination of analytes in biological fluids which uses said modified electrodes are also described.