Gas Sensor Adsorbent Layer for Low Concentration Detection
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Solution Overview
Problem
Conventional gas sensors, such as the substance detection sensor 300 described in Patent Literature 1, fail to reliably detect gases with low concentrations.
Innovation Solution
A gas sensor comprising a substrate with a first and second conductor, an insulating layer covering them, and an adsorbent layer containing conductive material and organic adsorbent, where the adsorbent layer is exposed through openings in the insulating layer to interact with the conductors, allowing for significant changes in electric resistance upon gas adsorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional substance detection sensor with a conductive layer is used, then the sensor structure is simple, but the gas detection reliability for low concentration gases is insufficient
Solution Approach 1:
The patent applies composite materials by combining a conductive layer with an adsorbent layer having specific porous structure and surface properties. The adsorbent layer contains pores with diameters of 0.3-10 nm and surface groups that selectively adsorb target gases, creating a composite sensing system that enhances detection reliability for low concentration gases while maintaining reasonable structural complexity
Solution Approach 2:
The patent utilizes porous materials by specifying an adsorbent layer with controlled pore diameters (0.3-10 nm) and appropriate pore volume. This porous structure increases the surface area available for gas adsorption and improves the sensor's ability to detect low concentration gases, directly addressing the reliability issue
2Measurement precision
If the conductive layer is made thicker to improve signal strength, then the detection sensitivity increases, but the response time decreases
Solution Approach 1:
The patent applies local quality by creating a layered structure where the conductive layer and adsorbent layer have distinct thicknesses and properties optimized for their specific functions. The adsorbent layer thickness is controlled at 0.1-10 μm to provide sufficient adsorption capacity while maintaining fast response, and the conductive layer thickness is optimized at 10-100 nm to ensure electrical conductivity without excessive response time
Solution Approach 2:
The patent implements dynamics by optimizing the thickness parameters of both layers to achieve a balance between sensitivity and response time. The specific thickness ranges allow the sensor to dynamically respond to gas concentrations while maintaining detection precision, resolving the trade-off between these two parameters
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
Enables reliable detection of gases, including those at low concentrations, by significantly altering the electric resistance due to changes in the adsorbent layer's volume, thereby improving detection accuracy and stability.
Implementation Method 1
an adsorbent layer that contains a conductive material and an organic adsorbent that can adsorb a gas
Implementation Method 2
changes an electric resistance value of the conductive layer 330. It is possible to detect the gas by measuring the change in the electric resistance value
Data Source
AI summary
A gas sensor includes: a substrate; a first conductor and a second conductor that are disposed on the substrate; an insulating layer; and an adsorbent layer. The insulating layer covers the first conductor and the second conductor, and has a first opening that allows a part of a surface of the first conductor to be exposed therethrough and a second opening that allows a part of a surface of the second conductor to be exposed therethrough. The adsorbent layer contains a conductive material and an organic adsorbent that can adsorb a gas. The adsorbent layer is in contact with the first conductor and the second conductor respectively through the first opening and the second opening.