Capacitive Hydrogen Sensor Using a Deforming Metal Oxide Layer
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Solution Overview
Problem
Existing sensors face challenges in achieving high detection sensitivity, particularly for low concentrations of gases like hydrogen, and there is a need for low-power consumption solutions.
Innovation Solution
A sensor design utilizing a base with fixed and movable electrodes and a metal oxide layer that changes volume in response to hydrogen, detecting changes in electrical capacitance due to stress induced by hydrogen interaction, allowing for high sensitivity and low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensors are used for hydrogen detection, then the device structure is simple, but the detection sensitivity is insufficient for low concentrations
Solution Approach 1:
The patent employs a thin film structure comprising a metal oxide layer deposited on a porous substrate. This thin film configuration increases the surface area-to-volume ratio, enabling higher detection sensitivity for hydrogen gas while maintaining a compact and relatively simple device structure. The metal oxide layer acts as the sensitive element that interacts with hydrogen molecules.
Solution Approach 2:
The patent utilizes a porous substrate as the basis for the metal oxide layer. The porous structure provides increased surface area for hydrogen adsorption and facilitates gas diffusion throughout the sensing element, thereby enhancing detection sensitivity without requiring complex device architecture. The porosity allows hydrogen molecules to access active sites more efficiently.
2Use of energy by moving object
If conventional sensors are used for hydrogen detection, then the device structure is simple, but the power consumption is high
Solution Approach 1:
The thin film metal oxide structure reduces the amount of material required and decreases the thermal mass, allowing the sensor to operate at lower temperatures or with reduced heating power while maintaining detection sensitivity. This directly addresses the power consumption issue without sacrificing measurement precision.
Solution Approach 2:
The porous substrate enables efficient gas transport and interaction with the metal oxide layer, enhancing the sensitivity-to-power ratio. The high surface area allows for effective hydrogen detection even with reduced heating power, as the porous structure facilitates better gas access and reaction efficiency.
3Measurement precision
If metal oxide layer is added to improve sensitivity, then the detection sensitivity increases, but the device complexity increases
Solution Approach 1:
The metal oxide is deposited as a thin film rather than a thick layer, which minimizes the added complexity while maximizing the sensitivity benefit. The thin film configuration reduces manufacturing complexity and allows for integration with standard sensor substrates, offsetting the added functional complexity.
Solution Approach 2:
By using a porous substrate, the patent reduces the required thickness of the metal oxide layer needed to achieve sufficient sensitivity. The porous structure provides the necessary surface area, allowing for a thinner metal oxide layer that is easier to manufacture and integrate, thereby reducing overall device complexity.
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 high detection sensitivity for hydrogen concentrations as low as 1 ppm with reduced power consumption by detecting changes in electrical capacitance resulting from structural deformation of the metal oxide layer.
Implementation Method 1
changes capacitance in response to gas concentration
Implementation Method 2
the first layer 31 includes at least one metal selected from the group consisting of Pt, Pd and Ti, and oxygen
Data Source
Figure 1~2
Figure 3A~3C
Figure 4A~4C
AI summary
According to one embodiment, a sensor includes a base, a base including a first region and a second region, a fixed electrode fixed to the first region, a first fixed portion fixed to the second region, a first support portion, and a movable portion. The first support portion is connected to the first fixed portion. The first support portion includes a first support layer and a first layer fixed to the first support layer. The first layer includes at least one metal selected from the group consisting of Pt, Pd and Ti, and oxygen. The movable portion is supported by the first support portion. A first gap is provided between the fixed electrode and the movable portion.