Solid-State Layered Ion Sensor for Stable Concentration Measurement
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Solution Overview
Problem
Conventional ion concentration measurement methods using solid-state sensors face challenges such as high ion sensitivity, chemical instability, and temperature dependence due to the use of reference electrodes, leading to inaccurate measurements and potential damage to the measurement environment.
Innovation Solution
A sensor with a solid-state layered structure comprising a semiconductor layer, a gold and oxygen-containing layer separated by an insulation layer, which reduces ion sensitivity and enhances chemical and thermal stability, allowing for accurate ion concentration determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional reference electrodes are used in solid-state ion concentration measurement, then ion concentration can be measured, but ion sensitivity is too high and chemical stability deteriorates
Solution Approach 1:
The patent extracts and removes the conventional reference electrode from the sensor system. Instead of using a traditional reference electrode with high ion sensitivity, the invention employs a solid-state sensor with a metal oxide layer that has deliberately reduced ion sensitivity, thereby eliminating the chemical instability and buffering issues associated with conventional reference electrodes while maintaining measurement functionality
Solution Approach 2:
The patent changes the ion sensitivity parameter of the reference electrode by using a metal oxide layer instead of conventional electrode materials. This parameter change reduces the ion sensitivity to an appropriate level, preventing the high ion sensitivity and chemical instability problems of traditional reference electrodes, while still enabling accurate ion concentration measurements through differential measurement
2Measurement precision
If conventional reference electrodes are used in solid-state sensors, then ion concentration measurement is enabled, but temperature dependence increases
Solution Approach 1:
The patent removes the temperature-sensitive conventional reference electrode from the system and replaces it with a solid-state metal oxide-based sensor that exhibits reduced temperature dependence, thereby maintaining measurement capability while improving thermal stability
Solution Approach 2:
The patent uses a composite structure consisting of a semiconductor substrate with a metal oxide layer to create a reference electrode alternative that combines the advantages of solid-state stability with reduced temperature dependence, enabling reliable measurements across varying temperature conditions
3Measurement precision
If solid-state sensors with high ion sensitivity are used, then measurement sensitivity is improved, but chemical instability and measurement errors increase
Solution Approach 1:
The patent applies local quality by creating a sensor system with two different solid-state sensors: one with higher ion sensitivity for measurement and one with reduced ion sensitivity as reference. This local differentiation in ion sensitivity allows the measurement sensor to maintain high sensitivity while the reference sensor provides stable baseline measurements, thereby resolving the contradiction between measurement sensitivity and chemical stability
Solution Approach 2:
The patent creates a copy of the solid-state sensor structure with modified properties (reduced ion sensitivity) to serve as a reference. This copied structure maintains the same solid-state stability and chemical resistance but with adjusted ion sensitivity, allowing differential measurement that eliminates the problem of high ion sensitivity causing chemical instability
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 achieves low ion sensitivity, improved chemical stability, and reduced measurement errors, enabling precise ion concentration measurements even in harsh environments.
Implementation Method 1
an insulation layer arranged between the first layer and the second layer
Data Source
AI summary
Sensor devices and systems having a solid-state layered structure and methods of producing the sensor devices and systems are described. In one embodiment, a sensor includes a first layer including a semiconductor material, a second layer including a gold material and an oxygen material, and an insulation layer arranged between the first and second layers.