HCl Gas Sensor Element Using AgI and AgCl Layers
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Solution Overview
Problem
Current gas sensors are inadequate in detecting hydrogen chloride (HCl) gas generated from insulating materials during fires, which hinders effective detection of electrical fires and prevention of fire and gas spreading.
Innovation Solution
A sensor element comprising an ionic layer with Ag ions, an ion conductive layer of AgI, and a reactive layer of AgCl, where Ag ions from the ion conductive layer react with HCl gas, generating an electromotive force for detection, manufactured using methods like electroplating and heat treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional gas sensor materials are used, then general gas detection is possible, but HCl gas detection sensitivity is insufficient
Solution Approach 1:
The patent applies local quality by using different materials for different layers: the ion conductive layer uses AgI (silver iodide) which has high ionic conductivity for Ag+ ions, while the reactive layer uses AgCl (silver chloride) which specifically reacts with HCl gas. This layered structure with differentiated material properties enables selective and sensitive HCl detection while maintaining overall sensor reliability
Solution Approach 2:
The sensor employs a composite structure combining AgI and AgCl layers. The AgI layer provides efficient Ag+ ion conduction, while the AgCl layer provides specific chemical reactivity with HCl gas. This composite material approach allows the sensor to achieve both high sensitivity to HCl and reliable detection by combining the complementary properties of two different materials
2Ease of manufacture
If a simple sensor structure is used, then manufacturing is easier, but detection mechanism for HCl is insufficient
Solution Approach 1:
The sensor is segmented into distinct functional layers: an ion conductive layer (AgI) and a reactive layer (AgCl). This segmentation allows each layer to be optimized for its specific function while maintaining a relatively simple overall structure that can be manufactured using standard thin-film deposition techniques, balancing manufacturing ease with effective HCl detection mechanism
Solution Approach 2:
The AgI layer acts as an intermediary that facilitates the transport of Ag+ ions from the reactive layer to the external circuit. This intermediary structure simplifies the overall detection mechanism by providing a dedicated ion conduction pathway, making the sensor easier to manufacture while maintaining the complexity needed for effective HCl detection through the AgCl layer
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 sensor element efficiently detects HCl gas, enabling early detection of electrical fires and preventing fire spreading by sensitively responding to HCl gas concentrations through changes in open circuit voltage.
Implementation Method 1
an ion conductive layer, in which the Ag ion is conducted
Implementation Method 2
a reactive layer, in which the Ag ion conducted from the ion conductive layer and HCl gas react with each other
Data Source
AI summary
The present invention relates to a sensor element for detecting hydrogen chloride (HCl) gas, a sensor device having the sensor element, and a method of manufacturing the sensor element, wherein the sensor element includes: an ionic layer including a Ag ion obtained through ionization; an ion conductive layer, in which the Ag ion is conducted, the ion conductive layer being formed on the ionic layer; and a reactive layer, in which the Ag ion conducted from the ion conductive layer and HCl gas react with each other, the reactive layer being formed on the ion conductive layer. The sensor element detects HCl gas generated from insulting materials when fire occurs, thereby detecting an electrical fire and preventing gas and fire spreading.