PVD Biosensor Electrode Coating for Precise Glucose Sensing

Solution Overview

Problem

Existing biosensors face challenges in achieving accurate and cost-effective glucose measurements due to the high cost of noble metal electrodes and the inadequate performance of non-noble metal electrodes, which often exhibit deviations in electrochemical response and electron transfer kinetics.

Innovation Solution

A biosensor electrode composed of a substrate with a conductive layer made of a non-precious metal alloy, specifically nickel, chromium, and iron, and a resistive material layer containing carbon and a carbon-nitrogen species, deposited via physical vapor deposition, which enhances mechanical robustness and electrochemical performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If screen-printed electrodes are used for electrochemical sensors, then manufacturing cost is reduced and ease of manufacture is improved, but measurement precision and reliability deteriorate due to inconsistent electroactive surface area and non-reproducible results

Engineering Contradiction:

Improveease of manufactureVSAvoidmeasurement precision

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent changes the manufacturing method from screen printing to physical vapor deposition (PVD), fundamentally altering the deposition parameters including vacuum conditions, deposition rate, and material source to achieve controlled, reproducible thin film formation that ensures consistent electroactive surface area across batches

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical screen printing process with a physical vapor deposition process that uses vacuum evaporation or sputtering to deposit the electroactive material, eliminating the inherent variability of mechanical printing while maintaining ease of manufacture through automated PVD equipment

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Quantity of substance

If screen-printed electrodes are used, then manufacturing cost is reduced, but reliability deteriorates due to batch-to-batch variability and inconsistent performance

Engineering Contradiction:

Improvemanufacturing costVSAvoidreliability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent replaces the mechanical screen printing process with a physical vapor deposition process that uses vacuum evaporation or sputtering to deposit the electroactive material, eliminating the inherent variability of mechanical printing while maintaining ease of manufacture through automated PVD equipment

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the manufacturing method from screen printing to physical vapor deposition (PVD), fundamentally altering the deposition parameters including vacuum conditions, deposition rate, and material source to achieve controlled, reproducible thin film formation that ensures consistent electroactive surface area across batches

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If conventional deposition methods are used to create electroactive layers, then ease of manufacture is improved, but manufacturing precision deteriorates due to uncontrolled thickness and composition

Engineering Contradiction:

Improveease of manufactureVSAvoidmanufacturing precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent replaces the mechanical screen printing process with a physical vapor deposition process that uses vacuum evaporation or sputtering to deposit the electroactive material, eliminating the inherent variability of mechanical printing while maintaining ease of manufacture through automated PVD equipment

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the manufacturing method from screen printing to physical vapor deposition (PVD), fundamentally altering the deposition parameters including vacuum conditions, deposition rate, and material source to achieve controlled, reproducible thin film formation that ensures consistent electroactive surface area across batches

Inventive Principle:

Principle #35Parameter changes

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 electrode provides consistent and accurate glucose measurements while reducing manufacturing costs, with improved electron transfer kinetics and anodic stability, minimizing electrical noise and ensuring reliable biosensor operation.

Implementation Method 1

The electrode comprises a physical vapor deposited (PVD) metal or alloy thin film electrodeposition on a substrate

Methodology Applied

Scientific EffectPhysical vapor deposition: Physical Vapour Deposition

Data Source

PatentEP3642605B1Physical vapor deposited electrode for electrochemical sensors

Publication Date: 2026.04.15 EASTMAN CHEM CO

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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.