Hygroscopic Gas Sensor Layer for Humid Detection
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Solution Overview
Problem
The high manufacturing cost of gas detectors due to the expensive materials used in the sensing layer, which limits their widespread adoption and affordability.
Innovation Solution
A gas sensor design featuring a hygroscopic electrically insulating material for the sensing layer, which reacts with gases in a humid environment to generate conductive substances, improving detection sensitivity and potentially reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensing layer materials are used, then detection capability is achieved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive conventional sensing materials with inexpensive hygroscopic electrically insulating materials that can be easily manufactured. The sensing layer uses common materials like cellulose, starch, or sugar that absorb moisture to become conductive, eliminating the need for costly specialized sensing materials while maintaining detection functionality.
Solution Approach 2:
The patent changes the electrical conductivity parameter of the sensing layer dynamically through humidity absorption. The hygroscopic material transitions from insulating to conductive state by absorbing moisture from the environment or target gas, enabling detection without requiring inherently conductive expensive materials.
2Ease of manufacture
If hygroscopic electrically insulating material is used for sensing layer, then manufacturing cost decreases, but detection sensitivity in dry environment deteriorates
Solution Approach 1:
The patent introduces moisture or water vapor as an intermediary substance that mediates between the hygroscopic sensing material and the target gas. The moisture absorbed by the hygroscopic material acts as a conductor, enabling electrical detection of gases that would otherwise not interact with the insulating material.
Solution Approach 2:
The patent utilizes the phase transition or state change of the sensing material from dry insulating state to humid conductive state. The hygroscopic material absorbs moisture to transition its electrical properties, enabling detection functionality only when hydrated, which provides selective sensing capability.
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 gas sensor achieves high sensitivity in detecting various gases, including ammonia, carbon monoxide, and hydrogen sulfide, down to parts-per-billion levels, with improved air stability and potentially lower production costs.
Implementation Method 1
The gas sensing layer is made of a hygroscopic electrically insulating material
Implementation Method 2
reacts with gases in a humid environment to generate conductive substances
Data Source
AI summary
A gas sensor for sensing a gas in a humid environment includes a first electrode layer, a second electrode layer that is spaced apart from the first electrode layer, and a gas sensing layer that electrically interconnects the first electrode layer and the second electrode layer. The gas sensing layer is made of a hygroscopic electrically insulating material.