PVD Ni-Cr Biosensor Electrode for Stable Electron Transfer
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Solution Overview
Problem
Current biosensors using non-noble metal electrodes face challenges in achieving consistent and accurate measurements due to instability and inadequate electrochemical responses, leading to high background currents and poor electron transfer kinetics, which increases manufacturing costs and reduces accuracy.
Innovation Solution
A biosensor electrode comprising a substrate with a conductive layer of nickel and chromium alloy, combined in specific weight percentages, and a resistive material layer of amorphous carbon, enhancing mechanical robustness and electrochemical stability, allowing for accurate biological sample measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-noble metal electrodes are used, then manufacturing cost is reduced, but measurement accuracy and reliability deteriorate due to instability and inadequate electrochemical responses
Solution Approach 1:
The patent applies composite materials by combining non-noble metals (such as nickel, chromium, iron) with noble metal coatings (such as palladium, gold, or platinum) to create a multi-layer electrode structure. The non-noble metal base provides cost advantages and mechanical strength, while the noble metal coating ensures accurate and stable electrochemical measurements. This composite approach resolves the contradiction between manufacturing cost and measurement reliability.
2Ease of manufacture
If non-noble metal electrodes are used, then manufacturing cost is reduced, but electron transfer kinetics deteriorate leading to high background currents
Solution Approach 1:
The patent uses composite materials with a non-noble metal base layer and a thin noble metal coating layer. The noble metal coating thickness is optimized to be sufficient for enabling fast electron transfer kinetics and reducing background currents, while the non-noble metal base provides cost benefits. This layered composite structure resolves the contradiction between manufacturing cost and electron transfer kinetics.
3Reliability
If noble metal electrodes are used, then measurement accuracy and stability are improved, but manufacturing cost increases
Solution Approach 1:
The patent applies composite materials where a thin layer of noble metal is deposited on a non-noble metal substrate. This structure maintains the electrochemical stability and accuracy benefits of noble metals while significantly reducing the amount of expensive noble metal required, thereby lowering manufacturing costs compared to using bulk noble metal electrodes.
Solution Approach 2:
The patent applies local quality by concentrating the noble metal material only at the electrode surface where electrochemical reactions occur, rather than using noble metal throughout the entire electrode structure. The non-noble metal is used for the bulk structure where mechanical strength is needed but electrochemical performance is less critical. This localized use of materials optimizes both performance and cost.
4Ease of manufacture
If non-noble metal electrodes are used, then manufacturing cost is reduced, but anodic stability deteriorates
Solution Approach 1:
The patent uses composite materials with a non-noble metal base layer and a noble metal coating layer. The noble metal coating provides the anodic stability required for reliable electrochemical measurements, while the non-noble metal base provides cost advantages and mechanical strength. This composite structure resolves the contradiction between manufacturing cost and anodic stability.
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 proposed electrode design provides consistent and accurate measurements while reducing manufacturing costs by improving anodic stability and electron transfer kinetics, ensuring reliable performance in biosensor applications.
Implementation Method 1
Physical vapor deposited thin film electrodes
Implementation Method 2
a resistive material layer of amorphous carbon, enhancing mechanical robustness and electrochemical stability
Implementation Method 3
an electrochemical reaction proportional to the amount of glucose in the blood will take place on the working electrode
Implementation Method 4
the reduced mediators are oxidized back to their original oxidation state
Data Source
AI summary
An electrochemical electrode and method for making same that provides enhanced characteristics for use in biosensors, such as blood glucose sensors. The electrode comprises a substrate, a conductive layer deposited on the substrate, and a resistive material layer deposited on the conductive layer. The conductive layer comprises nickel and chromium, and the resistive material layer comprises carbon and a carbon-nitrogen species.