CCFET Anesthetic Gas Sensor Receptor Layer Adsorption
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Solution Overview
Problem
Existing anesthetic gas sensors are costly, have short service lives, and are not suitable for chemically inert gases like anesthetic agents, which limits their effectiveness in monitoring and detecting anesthetic gas concentrations accurately.
Innovation Solution
A capacitively coupled field-effect transistor (CCFET) sensor with a receptor layer containing positive charge centers, specifically designed to detect anesthetic gases with trifluoromethyl groups, using titanium nitride or copper phthalocyanine layers, which allows for anisotropic adsorption and desorption without chemical reactions, enabling reliable and cost-effective monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spectroscopic or spectrometric methods (infrared, Raman, mass spectrometry) are used for anesthetic gas detection, then measurement precision is improved, but device cost increases significantly
Solution Approach 1:
The patent replaces complex spectroscopic or spectrometric measurement systems with a field-effect transistor-based sensor that detects anesthetic gases through electrical field interactions. The FET sensor uses a receptor layer that interacts with anesthetic gas molecules, causing changes in electrical conductivity that can be measured, thereby substituting expensive optical and mass spectrometric equipment with a simpler electrical sensing mechanism while maintaining detection capability
Solution Approach 2:
The patent changes the detection parameter from optical absorption or mass-to-charge ratio to electrical conductivity. By measuring the change in electrical field or current through the FET channel caused by anesthetic gas interaction with the receptor layer, the system achieves cost-effective detection without requiring complex spectroscopic equipment
2Measurement precision
If consuming sensors are used for anesthetic gas detection, then measurement precision is improved, but service life decreases at high concentrations
Solution Approach 1:
The FET sensor enables the system to monitor its own operational status and detect filter breakthrough events in real-time. The sensor continuously measures anesthetic gas concentrations and can trigger alerts when abnormal levels are detected, allowing the system to self-monitor and self-diagnose filter effectiveness without external intervention, thereby extending effective service life through proactive maintenance
3Duration of action of moving object
If chemical sensors are used for anesthetic gas detection, then service life is improved, but measurement precision deteriorates due to chemical inactivity of anesthetic gases
Solution Approach 1:
The patent introduces a receptor layer as an intermediary between the anesthetic gas and the FET sensor. This receptor layer is specifically designed to interact with anesthetic gas molecules through physical adsorption or weak chemical interactions, translating the presence of chemically inert anesthetic gases into measurable electrical signals that the FET can detect, thereby enabling precise measurement without requiring the anesthetic gases to be chemically reactive
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 CCFET sensor provides a non-consuming, fast response and recovery, independent of oxygen concentration, with high resolution at lower concentrations, and can measure anesthetic gas concentrations accurately in the vol. % range, offering improved safety and durability.
Implementation Method 1
The substances to be detected can preferably be adsorbed on the receptor layer. This can result in a concentration-dependent change in the electrical potential on the boundary surface
Implementation Method 2
The substances to be detected can preferably be adsorbed on the receptor layer
Implementation Method 3
which causes a change in the electrical conductivity of the semiconducting channel located under the insulation layer analogously to the applied potential in conventional FETs
Data Source
AI summary
A gas sensor for the detection of gases and vapors in air is particularly for the detection of anesthetic gases. A method for the detection and for the monitoring of such gases is also provided including detecting anesthetic gases with the gas sensor.