Electrochemical Sensor Thin-Film Packaging for Gas Detection
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Solution Overview
Problem
Current electrochemical gas sensors are costly, large, and have short lifespans due to issues like freezing limitations, rapid electrolyte evaporation, and poor performance at low temperatures, making them unsuitable for widespread, cost-effective applications such as home carbon monoxide monitoring and industrial safety.
Innovation Solution
A compact, low-cost electrochemical sensor design featuring a lid element coupled with a base element, incorporating multiple electrodes and signal communication channels, and an electrolyte element, which allows for efficient detection of gases like CO and CO2, with improved stability and reduced manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electrochemical gas sensors are used, then detection accuracy is improved, but manufacturing cost increases significantly
Solution Approach 1:
The sensor is divided into separate functional modules: a sensor element containing electrodes and electrolyte, a separate housing with inlet/outlet ports, and integrated circuit boards for signal processing. This modular segmentation enables independent optimization of each component and simplifies manufacturing and assembly processes.
Solution Approach 2:
The patent employs thin-film deposition techniques to create electrode layers with controlled thicknesses in the range of 10-100 nanometers. By precisely controlling film thickness and composition parameters, the sensor achieves high detection accuracy while using minimal material, thereby reducing manufacturing costs.
2Volume of moving object
If sensor size is reduced for portability, then integration into personal monitors is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes thin-film deposition to create electrode structures with thicknesses of 10-100 nanometers on flexible or rigid substrates. These thin-film structures enable miniaturization of the sensor while maintaining electrical performance, as the reduced dimensions are achieved through controlled film thickness rather than complex 3D geometries.
Solution Approach 2:
Traditional mechanical assembly of discrete electrode components is replaced with direct thin-film deposition techniques where electrode layers are grown or deposited directly onto the substrate in the desired pattern. This eliminates the need for precise mechanical alignment and assembly, reducing manufacturing precision requirements despite miniaturization.
3Reliability
If NAFION material is used for electrode coating, then electrochemical performance is improved, but operation at temperatures below 0°C is hindered
Solution Approach 1:
The patent describes composite electrode structures that combine NAFION material with other materials to create a composite coating. This composite approach allows the sensor to maintain the electrochemical performance benefits of NAFION while mitigating its temperature limitations through the complementary properties of the additional materials in the composite structure.
4Reliability
If liquid electrolyte is used, then ionic conduction is improved, but sensor lifetime is reduced due to evaporation and leakage
Solution Approach 1:
The patent describes using thin-film barriers and encapsulation layers to contain the liquid electrolyte within the sensor structure. These thin-film structures provide effective containment of the liquid electrolyte, preventing evaporation and leakage while maintaining ionic conduction pathways, thereby extending sensor lifetime without sacrificing electrochemical performance.
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 enables the production of high-performance, small-form-factor gas sensors that are more affordable, enhancing safety and monitoring capabilities across various applications while maintaining accuracy and durability.
Implementation Method 1
electrochemical cells have been used for detection of toxic gases since the 1970's
Implementation Method 2
an electrolyte element located in the sensor cavity
Data Source
AI summary
Some embodiments include an electrochemical sensor. The electrochemical sensor has a lid element comprising a substrate, multiple electrodes, multiple interior contacts electrically coupled to the multiple electrodes, a base element configured to be coupled to the lid element, and an electrolyte element. The base element includes a sensor cavity, multiple exterior contacts located at an exterior surface of the base element, and multiple signal communication channels comprising multiple signal communication lines, and the electrolyte element is located in the sensor cavity. When the lid element is coupled to the base element, the multiple electrodes are located in the sensor cavity, the multiple electrodes are in electrolytic communication with the electrolyte element, the multiple interior contacts are located in the sensor cavity, and the multiple interior contacts are electrically coupled to the multiple exterior contacts by the multiple signal communication lines. Other embodiments of related sensors and methods are also disclosed.