Conductive Carbon Electrode Wettability for Measurement Sensitivity

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Solution Overview

Problem

Existing carbon electrodes do not provide sufficient sensitivity for electrochemical measurements.

Innovation Solution

The electrode comprises a substrate film with a conductive carbon layer having a water contact angle of 80 degrees or less, optionally with a metal underlying layer, enhancing sensitivity by ensuring effective liquid spread and reaction efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a conventional conductive carbon layer is used on the substrate, then the electrode structure is simple, but the sensitivity to the object to be measured is insufficient

Engineering Contradiction:

ImprovesensitivityVSAvoidelectrode structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent changes the surface property parameter of the conductive carbon layer by controlling the water contact angle to be 80 degrees or less. This parameter change enhances the wettability and promotes efficient liquid spread across the electrode surface, thereby improving sensitivity to the object to be measured without adding structural complexity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite structure by forming a conductive carbon layer with specific surface properties (water contact angle ≤80 degrees) on top of a substrate film. This composite approach combines the electrical conductivity of carbon with controlled surface wettability, achieving both structural simplicity and enhanced measurement sensitivity

Inventive Principle:

Principle #40Composite materials

2Productivity

If the water contact angle of the conductive carbon layer is not controlled, then the manufacturing process is simple, but the liquid spread and reaction efficiency are insufficient

Engineering Contradiction:

Improvereaction efficiencyVSAvoidmanufacturing process

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent introduces a specific parameter control (water contact angle ≤80 degrees) during the manufacturing of the conductive carbon layer. This parameter ensures optimal liquid spread and reaction efficiency while maintaining compatibility with conventional manufacturing processes such as sputtering or chemical vapor deposition, thus not significantly complicating the manufacturing process

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 achieves improved sensitivity for electrochemical measurements by ensuring efficient liquid contact and reaction, particularly for glucose detection.

Implementation Method 1

a water contact angle of a one-side surface of the conductive carbon layer in the thickness direction is 80 degrees or less

Methodology Applied

Scientific EffectWetting: Wetting

Data Source

PatentEP4597093A1Electrode and electrochemical measurement system

Publication Date: 2025.08.06 NITTO DENKO CORP

Figure 1~2

AI summary

An electrode (1) includes a substrate film (2) and a conductive carbon layer (4) in order toward one side in a thickness direction. A one-side surface of the conductive carbon layer (4) in the thickness direction has a water contact angle of 80 degrees or less.