Layered Hydrogen Sensor Barrier for Oxygen and Water Resistance
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Solution Overview
Problem
Existing sensors face challenges in achieving stable detection due to the influence of substances other than the target, such as oxygen and water, which affect the properties of the detection layer, leading to reduced sensitivity and linearity in detecting targets like hydrogen.
Innovation Solution
The sensor incorporates a first film made of silicon and oxygen, and an intermediate layer of Pd, Pt, or Ti, which suppresses the permeation of substances like oxygen and water, while the detection layer, often composed of Pd, Cu, and Si, allows for high sensitivity and stability by minimizing structural changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection layer is made highly sensitive to detect hydrogen, then detection sensitivity is improved, but the sensor becomes more vulnerable to interference from substances like oxygen and water
Solution Approach 1:
An intermediate layer is introduced between the detection layer and the external environment. This intermediate layer selectively permits hydrogen to reach the detection layer while blocking other substances (oxygen, water) from interfering with the detection process, thus resolving the contradiction between high sensitivity and resistance to harmful factors
Solution Approach 2:
Different layers of the sensor are assigned different functional properties: the detection layer is optimized for high hydrogen sensitivity, while the intermediate layer is designed with selective permeability characteristics. This local differentiation allows each component to perform its specific function optimally without compromising the overall sensor performance
2Measurement precision
If the detection layer is exposed to the environment to enable detection, then detection capability is improved, but structural stability is reduced due to changes caused by substances like oxygen and water
Solution Approach 1:
The intermediate layer serves as a protective barrier that maintains the structural stability of the detection layer by preventing direct contact with harmful substances (oxygen, water), while still allowing the detection function to operate effectively through selective permeability
Solution Approach 2:
The sensor structure is divided into distinct functional segments: an intermediate layer for protection and selectivity, and a detection layer for sensing. This segmentation allows each layer to be optimized independently - the intermediate layer for stability and the detection layer for sensitivity
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 stable and high-sensitivity detection of hydrogen by preventing interference from substances like oxygen and water, maintaining linearity over a wide concentration range and reducing hysteresis in absorption and release processes.
Implementation Method 1
a volume of the first layer is changeable depending on a detection target around the structure
Implementation Method 2
suppresses the permeation of substances like oxygen and water
Data Source
AI summary
According to one embodiment, a sensor includes a structure. The structure includes a first layer, a first film including a first film region, and a first intermediate layer including a first partial region. The first partial region is between the first layer and the first film region. A volume of the first layer is changeable depending on a detection target around the structure. The first film includes silicon and oxygen. The first intermediate layer includes at least one selected from the group consisting of Pd, Pt and Ti.