Hydrogen Sensor with Segmented Oxide Film for Interference Resistance
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Solution Overview
Problem
Existing sensors face challenges in achieving stable detection of gas targets like hydrogen due to interference from other substances and temperature variations, leading to instability and reduced sensitivity.
Innovation Solution
A sensor structure comprising a base layer, a film layer made of silicon or aluminum oxides, and a first layer that changes volume or electrical resistance in response to hydrogen, with the film layer positioned between the base layer and film regions to prevent interference from other substances and include materials like PdCuSi for effective hydrogen detection, and a configuration that includes a movable electrode to detect capacitance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor uses a simple structure without protective films, then manufacturing is easier and device complexity is reduced, but detection stability deteriorates due to interference from other substances and temperature variations
Solution Approach 1:
The sensor structure is segmented into multiple functional layers: base layer, first film (protective layer), second film (interference layer), and first layer (detection layer). Each layer performs a specific function - the base layer provides structural support, the first film protects from environmental interference, the second film blocks specific interfering substances, and the first layer detects hydrogen. This segmentation resolves the contradiction by achieving stable detection through layered protection while maintaining manufacturability through standard thin-film deposition techniques.
Solution Approach 2:
The sensor employs composite material structure combining different materials with complementary properties: silicon oxide or aluminum oxide for the protective first film, palladium-containing materials for the hydrogen-sensitive first layer, and specific interference-blocking materials for the second film. This composite approach achieves detection stability by leveraging the unique properties of each material - oxidation resistance, hydrogen sensitivity, and interference blocking - while the overall structure remains manufacturable using established thin-film fabrication processes.
2Reliability
If a sensor uses protective films and complex structure, then detection stability improves by preventing interference, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies optimized parameter ranges for each layer to balance protection and manufacturability: the first film thickness is controlled at 1-10 nm providing sufficient protection without excessive complexity, the second film thickness is optimized at 1-5 nm for effective interference blocking, and the first layer thickness is set at 1-10 nm for adequate hydrogen sensitivity. These parameter specifications resolve the contradiction by defining precise yet achievable manufacturing targets that ensure detection stability while remaining compatible with standard thin-film deposition capabilities.
3Measurement precision
If a sensor uses PdCuSi material for hydrogen detection, then sensitivity to hydrogen improves, but interference from other substances increases
Solution Approach 1:
The second film acts as an intermediary layer positioned between the environment and the PdCuSi detection layer. This intermediary structure selectively blocks interfering substances (such as oxygen and other gases) from reaching the PdCuSi material while allowing hydrogen to pass through and interact with the detection layer. The first protective film serves as an additional intermediary barrier. This intermediary approach resolves the contradiction by maintaining high hydrogen sensitivity of PdCuSi while filtering out interfering substances that would otherwise cause false signals.
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 stable and sensitive detection of hydrogen concentrations by minimizing interference and maintaining detection accuracy across temperature fluctuations, with enhanced sensitivity and reduced hysteresis in absorption and release processes.
Implementation Method 1
At least one of a volume of the first layer or an electrical resistance of the first layer is configured to change according to a detection target around the structure
Implementation Method 2
At least one of a volume of the first layer or an electrical resistance of the first layer is configured to change according to a detection target around the structure
Implementation Method 3
the first film including a first film region, a second film region, and a third film region... to prevent interference from other substances
Implementation Method 4
a configuration that includes a movable electrode to detect capacitance changes
Data Source
AI summary
According to one embodiment, a sensor includes a structure. The structure includes a base layer, a first film, and a first layer. The first film includes at least one selected from a group consisting of silicon and aluminum, and oxygen. At least one of a volume of the first layer or an electrical resistance of the first layer is configured to change according to a detection target around the structure. The first film includes a first film region, a second film region, and a third film region. The first layer is between the base layer and the first film region in a first direction from the base layer to the first film region. The first layer is between the second film region and the third film region in a second direction crossing the first direction.