Porous Paper Gas Sensor for Respiration Monitoring
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Solution Overview
Problem
Current gas detection methods are hindered by high costs, complex fabrication procedures, dependence on high temperatures, low selectivity, use of rigid materials, and the need for frequent calibration, which limits their effectiveness in applications such as sleep apnea diagnosis and gas monitoring in medical diagnostics.
Innovation Solution
Development of room-temperature gas sensors using hygroscopic porous substrates, such as cellulose-based paper, with electrode pairs that measure changes in conductivity due to water adsorption, allowing for accurate detection of gases like ammonia and acetone, and monitoring of respiration patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional gas detection methods are used, then detection accuracy is maintained, but cost and device complexity increase significantly
Solution Approach 1:
The patent uses porous paper substrates as the sensing element, which provide high surface area for gas interaction while maintaining simplicity. The porous structure allows gas molecules to penetrate and interact with the sensing material, enabling accurate detection without complex device architecture.
Solution Approach 2:
The invention employs low-cost, disposable paper-based sensors that eliminate the need for expensive, complex electronic components. The sensors are designed to be single-use or limited-life devices, reducing calibration requirements and overall system complexity while maintaining detection accuracy.
2Measurement precision
If metal-oxide sensors are used, then gas detection capability is achieved, but high temperature operation is required
Solution Approach 1:
The patent changes the operating temperature parameter from high (metal-oxide sensors requiring hundreds of degrees Celsius) to room temperature by using different sensing materials. The paper-based sensors with conductive inks or nanomaterials function effectively at ambient temperatures, eliminating heating requirements.
Solution Approach 2:
The invention replaces the thermal field-based detection mechanism of metal-oxide sensors with electrical field-based detection using conductive materials on paper. This substitution eliminates the need for thermal processing and high-temperature operation.
3Measurement precision
If vapor phase grown ceramic thin films are used, then sensor performance is improved, but fabrication complexity increases
Solution Approach 1:
The patent uses paper as a template or scaffold that can be easily manufactured and replicated. The paper substrate supports the sensing material and provides a simple, low-cost platform that avoids complex ceramic film deposition processes while maintaining sensor functionality.
Solution Approach 2:
The porous paper substrate provides sufficient surface area and gas permeability without requiring complex ceramic thin film structures. The natural porosity of paper eliminates the need for sophisticated vapor phase growth processes while achieving comparable or superior sensor performance.
4Stability of the object's composition
If rigid sensor materials are used, then structural stability is maintained, but flexibility and adaptability are reduced
Solution Approach 1:
The patent uses flexible paper substrates instead of rigid materials, allowing the sensors to be conformally attached to various surfaces including skin, clothing, or irregularly shaped objects. The paper maintains sufficient structural stability for sensing while providing the flexibility needed for diverse applications.
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 solution provides a low-cost, flexible, and accurate method for gas detection and respiration monitoring, enabling effective diagnosis of conditions like sleep apnea without the need for expensive equipment or clinical settings.
Implementation Method 1
hygroscopic porous substrates that are able to attract and adsorb water from the environment
Implementation Method 2
measuring the conductivity of the water within the porous substrate
Data Source
AI summary
A method of and system for detecting a gas or vapor includes providing a sensor comprising an electrode pair in electrical contact with a layer of porous material, the porous material layer having water adsorbed on its surface; contacting the sensor with a gas or vapor sample to be analysed; applying a voltage across the electrode pair of the sensor; and measuring a response, the response correlating to the presence of a target gas or vapor.