Nickel Alloy Biosensor Electrodes Cost Reduction
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Solution Overview
Problem
Existing biosensors rely on expensive precious metals like gold, silver, and platinum for electrodes, which are costly and limit market opportunities, while also lacking in physical and electrical properties advantageous for enzyme/mediator systems.
Innovation Solution
Development of nickel-based alloys, including binary, ternary, or quaternary combinations with elements like aluminum, gold, chromium, copper, molybdenum, palladium, ruthenium, tantalum, and titanium, for use as electrodes in biosensors, providing improved physical and electrical properties such as thinness, conductivity, and stability without using precious metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precious metals like gold, silver, and platinum are used for electrodes, then electrical conductivity and stability are improved, but cost increases significantly
Solution Approach 1:
The patent changes the material composition parameters by using nickel-based alloys with specific elemental ratios (Ni: 60-95 at%, Al: 5-30 at%, Cr: 5-20 at%, Ru: 5-20 at%, Ti: 5-20 at%) to achieve desired electrical and mechanical properties without relying on precious metals, thereby reducing cost while maintaining performance
Solution Approach 2:
The patent employs composite material design by creating multi-element nickel-based alloys that combine the advantages of different metals: nickel provides base conductivity and structural stability, aluminum enhances conductivity and reduces cost, chromium improves corrosion resistance, ruthenium boosts catalytic activity, and titanium strengthens mechanical properties. This composite approach achieves precious metal-level performance at lower cost
2Adaptability or versatility
If precious metals are used for electrodes, then market opportunities are limited due to high cost, but alternative materials lack advantageous physical and electrical properties for enzyme/mediator systems
Solution Approach 1:
The patent optimizes alloy composition parameters to achieve specific electrical conductivity ranges (10^-5 to 10^-3 S/cm) and surface properties that are ideal for enzyme immobilization and mediator electron transfer, making the electrodes suitable for biosensor applications without using precious metals
Solution Approach 2:
The patent enhances surface properties locally by controlling the surface composition and morphology of the nickel-based alloy electrodes to create optimal interaction sites for enzymes and mediators, while the bulk material provides structural stability and cost-effectiveness
3Ease of manufacture
If nickel-based alloys are used instead of precious metals, then cost is reduced and electrical conductivity is improved, but material stability may be compromised
Solution Approach 1:
The patent creates a stable nickel-based composite alloy where chromium (5-20 at%) provides exceptional corrosion resistance, ruthenium (5-20 at%) enhances electrochemical stability and catalytic activity, and titanium (5-20 at%) strengthens mechanical properties. This multi-element composite structure ensures long-term stability comparable to or exceeding precious metals
Solution Approach 2:
The patent carefully controls the concentration parameters of each alloying element to achieve optimal stability: nickel (60-95 at%) provides structural framework, aluminum (5-30 at%) enhances conductivity without compromising stability, chromium (5-20 at%) prevents corrosion, ruthenium (5-20 at%) ensures electrochemical stability, and titanium (5-20 at%) provides mechanical strength
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 nickel-based alloys offer cost-effective alternatives with enhanced electrical conductivity, stability, and reactivity, enabling efficient glucose detection in biosensors, comparable to traditional precious metal electrodes.
Implementation Method 1
An electron mediator is an artificial electron transferring agent that helps shuttle electrons from the redox enzyme to the electrode surface
Implementation Method 2
The analyte (glucose) in the sample undergoes a reduction/oxidation reaction at the working electrode (where the redox enzyme is located)
Data Source
AI summary
The present disclosure relates to metal alloys for biosensors. An electrode is made from the metal alloy, which more specifically can be a nickel-based alloy. The alloy provides physical and electrical property advantages when compared with existing pure metal electrodes.