Thermally Stable Conductive Polymers for Gas Sensors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrochemical gas sensors face issues with size, thermal stability, signal-to-noise ratio, and compatibility with high-temperature soldering processes, limiting their reliability and portability, especially in applications requiring compact, low-power, and fast response sensors.
Innovation Solution
The use of thermally stable conductive aromatic polymers with aromatic groups containing nitrogen, infused in an inorganic acid, which form the basis for membrane electrode assemblies that provide enhanced thermal stability and conductivity, enabling compact, low-energy consumption, and high-temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional polymer electrolytes are used in electrochemical gas sensors, then the sensors can be manufactured with standard materials, but the sensors cannot withstand temperatures above 150°C and cannot survive solder reflow processes
Solution Approach 1:
The patent uses a composite material consisting of an aromatic polymer backbone (providing thermal stability) infused with inorganic acid (providing ionic conductivity). This composite structure allows the electrolyte to withstand temperatures up to 280°C while maintaining electrochemical functionality, enabling direct soldering without damage.
2Volume of moving object
If the sensor size is reduced for portability, then the sensor becomes more suitable for portable devices, but the stabilization time increases and signal-to-noise ratio decreases
Solution Approach 1:
The patent changes the physical and chemical parameters of the electrolyte by using a highly conductive inorganic acid-infused aromatic polymer. This increases ionic conductivity and reduces electrolyte volume, enabling compact sensor design with fast response times and high signal-to-noise ratio despite reduced size.
3Ease of manufacture
If conventional electrolytes are used, then the manufacturing process is simple, but additional protective measures are needed that increase sensor size and power consumption
Solution Approach 1:
The patent changes the thermal parameter of the electrolyte material to withstand soldering temperatures directly. This eliminates the need for additional protective measures such as thermal barriers or indirect mounting techniques, simplifying the manufacturing process while maintaining compact sensor size.
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 results in electrochemical gas sensors that maintain stability and functionality across a wide temperature range, including solder reflow temperatures, and improve signal quality and sensor compactness, addressing the limitations of conventional sensors.
Implementation Method 1
thermally stable conductive aromatic polymers with aromatic groups containing nitrogen, infused in an inorganic acid
Implementation Method 2
measuring the concentration of a target gas by oxidizing or reducing the gas at an electrode and measuring the resulting current
Implementation Method 3
measuring the concentration of a target gas by oxidizing or reducing the gas at an electrode and measuring the resulting current
Data Source
AI summary
Aromatic polymers exhibiting thermal stability and conductivity upon imbibement into an acid are disclosed for electrochemical gas sensor applications. Membrane electrode assemblies for electrochemical gas sensors are also provided, comprising a sensing electrode, a counter electrode, and a polymer membrane comprising the polymers of the present invention, disposed between the sensing electrode and the counter electrode.