Hydrogen Gas Sensor Metal Oxide Layer Local Oxygen Deficiency
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Solution Overview
Problem
Existing gas sensors for hydrogen detection face challenges in accurately and efficiently measuring hydrogen concentrations due to limitations in resistance variation and sensitivity, particularly in response time and power consumption.
Innovation Solution
A gas sensor design featuring a metal oxide layer with a local region of higher oxygen deficiency, exposed to hydrogen-containing gases, where the resistance value changes based on hydrogen exposure, allowing for sensitive detection and low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a metal oxide layer with a local region of higher oxygen deficiency is used, then sensitivity to hydrogen detection is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by creating a local region within the metal oxide layer that has a higher degree of oxygen deficiency compared to the bulk region. This localized modification enhances hydrogen detection sensitivity in specific areas without requiring the entire sensor structure to be complex. The local region with increased oxygen deficiency serves as the active sensing zone where hydrogen detection occurs more effectively.
2Measurement precision
If multiple detection cells with different response times are used, then hydrogen concentration measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent employs segmentation by dividing the sensing function across multiple detection cells, each with distinct response time characteristics. This segmentation allows the system to measure hydrogen concentration more accurately by analyzing the temporal patterns of resistance changes across cells with different response speeds, effectively resolving the trade-off between measurement accuracy and device complexity.
3Speed
If the metal oxide layer has varying oxygen deficiency regions, then response time to hydrogen is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements local quality by intentionally creating regions with different oxygen deficiency levels within the metal oxide layer. This approach improves response time by having specific local areas that react more quickly to hydrogen exposure, while the overall manufacturing process maintains acceptable precision requirements through controlled local variations rather than requiring uniform high-precision control throughout the entire 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 effectively detects hydrogen concentrations with varying response times and sensitivities across multiple detection cells, enabling precise hydrogen detection with minimal power usage.
Implementation Method 1
a metal oxide layer which includes a bulk region and a local region surrounded by the bulk region, a degree of oxygen deficiency of the local region being higher than a degree of oxygen deficiency of the bulk region. In each of the detection cells, a resistance value of the metal oxide layer decreases with a response time, which is different in each of the detection cells, when a gas containing a hydrogen atom comes into contact with the second electrodes
Implementation Method 2
Sensors and Actuators A: Physical, 172 (2011) pages 9-14 discloses a Pt/Ta2O5 Schottkey diode for hydrogen sensing. In the Schottkey diode, a hydrogen molecule dissociates into hydrogen atoms on the surface of the catalyst Pt
Data Source
AI summary
A gas sensor includes an insulation layer and detection cells covered with the insulation layer. Each of the plurality of detection cells includes: a first electrode; a second electrode having a surface exposed from the insulation layer; and a metal oxide layer disposed between the first electrode and the second electrode. In each of the detection cells, a resistance value of the metal oxide layer decreases with a response time, which is different in each of the detection cells, when a gas containing a hydrogen atom comes into contact with the second electrodes.