Suspended Nanowire Hydrogen Sensor with Perpendicular Heating Electrodes
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Solution Overview
Problem
Conventional hydrogen gas sensors, including suspended nanowire structures, have slow response rates due to non-uniform temperature distribution along the nanowires, which does not meet the standards set by the US Department of Energy for hydrogen sensor performance.
Innovation Solution
A suspended nanowire structure with heating electrodes disposed on both ends of the nanowires, extending perpendicular to their direction, to supplement heat loss and achieve uniform temperature distribution, thereby enhancing reaction speed and sensing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heating methods are used in suspended nanowire structures, then the nanowire can be heated to high temperature, but the temperature distribution along the nanowire becomes non-uniform, resulting in slow response rate
Solution Approach 1:
The heating function is segmented into multiple independent heating electrodes positioned at different locations along the nanowire. This allows each heating electrode to independently control the temperature at its specific location, ensuring uniform temperature distribution across the entire nanowire length, which directly resolves the contradiction between achieving high temperature and maintaining temperature uniformity for fast response
Solution Approach 2:
Multiple heating electrodes are merged into a coordinated heating system that works together to provide uniform heating along the nanowire. By combining the heating effects from multiple electrodes positioned at different locations, the system achieves both high temperature operation and uniform temperature distribution simultaneously, resolving the response rate limitation
2Productivity
If the nanowire is operated at high temperature to improve reaction speed, then the reaction rate increases, but heat loss from the nanowire increases, making it difficult to maintain uniform temperature
Solution Approach 1:
Heating electrodes are positioned upstream and along the nanowire to preemptively supply heat before significant heat loss occurs. This preliminary heating action compensates for the expected heat loss at high temperatures, maintaining uniform temperature distribution and enabling sustained fast reaction rates without excessive energy waste
Solution Approach 2:
The coordinated control of multiple heating electrodes creates a feedback mechanism where temperature at different locations can be independently regulated. This allows the system to detect and compensate for heat loss at specific locations, maintaining uniform temperature and optimal reaction speed while minimizing overall energy loss through precise local control
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 high-speed operation and improved gas sensing by ensuring uniform temperature across the nanowires, reducing the temperature difference and enhancing the reaction rate to hydrogen gas within 1 second, thus meeting the US DOE standards.
Implementation Method 1
a heating electrode which is disposed on both ends of the plurality of nanowires, extends in a second direction perpendicular to the first direction, and provides heat to both ends of the plurality of nanowires during driving
Implementation Method 2
palladium (Pd) is widely used as a gas sensor because it selectively and actively reacts with hydrogen
Data Source
AI summary
The present invention relates to a suspended nanowire structure. The present invention, more particularly, relates to a suspended nanowire structure capable of high-speed operation by improving the reaction rate by making the temperature distribution of the nanowire uniform.A suspended nanowire structure in accordance with an embodiment of the present invention comprises: a substrate; a plurality of nanowires float on the substrate and extending along a first direction; electrodes respectively connected to both ends of the plurality of nanowires; and a heating electrode which is disposed on both ends of the plurality of nanowires, extends in a second direction perpendicular to the first direction, and provides heat to both ends of the plurality of nanowires during driving.