Amperometric Sensor Insulating Substrate Electrode Design
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Solution Overview
Problem
Existing amperometric electrochemical sensors face challenges such as complex manufacturing processes, limited lifetime due to membrane degradation, and the need for silicon substrates, which restricts miniaturization and flexibility in electrode design and substrate materials.
Innovation Solution
An amperometric electrochemical sensor with a simplified production method using an insulating substrate with patterned electrodes covered by a polymeric filtration membrane, allowing for nanostructured openings and direct electrode access, enabling use on non-silicon substrates like glass or ceramics, and featuring a dual-membrane configuration for enhanced adhesion and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diffusion membrane completely covers all three electrodes, then selectivity and protection are improved, but manufacturing complexity increases and electrode design flexibility is reduced
Solution Approach 1:
The diffusion membrane is segmented to cover only the working electrode rather than all three electrodes. This is achieved by defining the membrane's active area through a mask during deposition, creating a localized selective barrier that simplifies manufacturing while maintaining measurement selectivity.
Solution Approach 2:
The diffusion membrane's selective coverage is applied locally only where needed for measurement (working electrode) rather than uniformly across all electrodes. This local quality approach allows the counter and reference electrodes to remain exposed and accessible, simplifying electrical connections and manufacturing processes.
2Manufacturing precision
If the working electrode is made large enough for membrane deposition, then membrane coverage is improved, but sensor miniaturization is hindered
Solution Approach 1:
The mask is applied beforehand during the membrane deposition process to define the precise area where the membrane should form. This preliminary action allows complete and uniform membrane coverage on the working electrode even when the electrode is small, enabling miniaturization while maintaining manufacturing precision.
Solution Approach 2:
The use of a mask during membrane deposition allows the membrane to be formed with controlled porosity and precise geometric definition. This approach enables adequate membrane coverage on miniaturized electrodes by controlling the deposition process rather than relying on electrode size.
3Adaptability or versatility
If an insulating layer with openings is used to define electrodes, then electrode shape flexibility is improved, but manufacturing process complexity increases
Solution Approach 1:
Instead of creating electrodes by removing material (openings in insulating layer), the invention inverts the approach by depositing the membrane through a mask that defines the electrode areas directly. This eliminates the need for complex insulating layer patterning and opening creation steps.
Solution Approach 2:
The complex insulating layer with openings is extracted from the manufacturing process. The electrode definition function is achieved more simply through mask-guided membrane deposition, removing unnecessary manufacturing steps while maintaining electrode shape flexibility.
4Adaptability or versatility
If electroreactive species are immobilized in the membrane, then measurement capability for non-electroactive species is improved, but membrane lifespan is reduced
Solution Approach 1:
Instead of immobilizing electroreactive species in the membrane, the invention uses the dissolved oxidoreducible substance itself as the intermediary that reacts at the working electrode surface. This eliminates membrane saturation and leakage issues while maintaining the ability to measure non-electroactive species through their interaction with the electrode.
Solution Approach 2:
The measurement system uses the target analyte (dissolved oxidoreducible substance) directly without requiring additional immobilized intermediaries. The substance serves its own measurement function by undergoing redox reactions at the electrode, eliminating the need for consumable membrane components and extending membrane lifespan.
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
The solution improves sensor adhesion, stability, and selectivity, enabling prolonged operation without recalibration, miniaturization, and compatibility with various substrates, while allowing direct measurement of oxidoreducible substances without the need for liquid electrolytes.
Implementation Method 1
The membrane defines a diffusion layer for the oxidoreducible substance
Implementation Method 2
measuring the current flowing between the working electrode and the counter electrode, induced by a redox reaction at the working electrode
Data Source
Figure 1~2
Figure 3~5
Figure 4a~4h
AI summary
The present invention relates to an amperometric electrochemical sensor with a fixed potential used in a probe for measuring the content of an oxidation reduction substance dissolved in a liquid, in particular the chlorine content. The sensor (1) includes an insulating substrate (2), a set of electrodes consisting of a working electrode (3), an auxiliary electrode (4) and a reference electrode, at least one of said working electrode (3) and auxiliary electrode (4) being configured on said insulating substrate (2). At least one of said working electrode (3) and auxiliary electrode (4) is covered with an insulating layer (8), said insulating layer (8) including at least one opening exposing at least one of said working electrode (3) and auxiliary electrode (4).