Ruthenium Alloy Biosensor Electrodes for Cost Reduction
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Solution Overview
Problem
Existing glucose biosensors rely on expensive precious metals like silver, gold, and platinum for electrodes, which are costly and limit market opportunities, while also lacking in terms of physical and electrical properties such as thinness and conductivity.
Innovation Solution
Development of ruthenium-based metal alloys, including binary, ternary, and quaternary alloys with elements like aluminum, chromium, copper, nickel, and tungsten, for use as electrodes in biosensors, which are formed through physical vapor deposition and sputtering techniques, providing improved physical and electrical properties without using precious metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precious metals (silver, gold, 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 ruthenium-based alloys with specific element ratios (Ru:Al = 1:4 to 1:1, Ru:Cr = 1:4 to 1:1, etc.) to achieve optimal electrode performance. This parameter optimization allows non-precious metals to attain the stability and conductivity previously only achievable with expensive precious metals, thereby resolving the contradiction between reliability and manufacturing cost.
Solution Approach 2:
The patent employs composite material structures by combining ruthenium with alloying elements (Al, Cr, Cu, Ni, Mo, Re, W) to create multi-element alloys. These composite alloys leverage the synergistic effects of different metals to achieve enhanced electrical conductivity, corrosion resistance, and mechanical properties, replacing single-precious-metal electrodes while maintaining performance and reducing cost.
2Reliability
If precious metals are used for electrodes, then electrochemical performance is improved, but device complexity and cost increase
Solution Approach 1:
The patent optimizes alloy composition parameters within specific ranges (e.g., Ru 70-95 at%, Al 5-30 at%, Cr 5-30 at%) to achieve desired electrochemical performance. By controlling these parameters, the patent simplifies the material selection process and enables standardized manufacturing of high-performance electrodes without precious metals, resolving the contradiction between electrochemical performance and device complexity.
3Ease of manufacture
If non-precious metal alloys are used, then cost is reduced, but electrical conductivity and physical properties deteriorate
Solution Approach 1:
The patent systematically varies the composition parameters of ruthenium-based alloys to optimize electrical conductivity. Specific compositional ranges are identified (e.g., Ru:Al ratio of 1:4 to 1:1, Ru:Cr ratio of 1:4 to 1:1) that achieve conductivity levels comparable to or exceeding precious metal electrodes, thereby resolving the contradiction between cost reduction and maintaining electrical conductivity.
Solution Approach 2:
The patent creates composite alloys combining ruthenium with elements known for enhancing electrical properties (Al, Cr, Cu, Ni, Mo, Re, W). These composite materials leverage the high conductivity of certain alloying elements to compensate for the lower intrinsic conductivity of non-precious metals, achieving overall superior electrical performance at reduced cost.
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 ruthenium-based alloys offer enhanced electrical conductivity, stability, and cost-effectiveness, enabling the creation of thinner, more durable electrodes with consistent bias response and improved electrochemical performance compared to traditional precious metal electrodes.
Implementation Method 1
which are formed through physical vapor deposition and sputtering techniques
Implementation Method 2
which are formed through physical vapor deposition and sputtering techniques
Implementation Method 3
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 ruthenium metal or a ruthenium-based alloy. The resulting electrode has physical and electrical property advantages when compared with existing pure metal electrodes.