The hydrogen sensor can accurately detect leaks in time, thus avoiding the generation of flammable and explosive gases when hydrogen is mixed with air. Image source: Chalmers University of Technology
Hydrogen is a clean, renewable energy source that can power cars, and the only emission is water. However, when hydrogen is mixed with air, it is extremely flammable, so a very effective sensor is needed to solve this problem. Recently, researchers from Chalmers University of Technology in Sweden have developed a hydrogen sensor, which has accelerated the application of hydrogen-fueled vehicles.
This breakthrough research result was recently published in Nature-Materials. The discovery is an optical nanosensor encapsulated in plastic materials. The working principle of this sensor is based on an optical phenomenon, plasma, which occurs when metal nanoparticles are illuminated and capture visible light. The color of the sensor will change as the hydrogen content in the environment changes.
The plastic around the miniature sensor can not only play a protective role, but also a key component. It accelerates the absorption of hydrogen molecules into the metal particles that can be detected, thereby improving the response time of the sensor. At the same time, plastic acts as an effective barrier to the external environment, preventing any other molecules from entering the sensor. Therefore, the sensor can work safely and efficiently to meet the strict requirements of the automotive industry, and can detect 0.1% of hydrogen in the air in less than one second.
Felix Nugroho, a researcher at the Department of Physics at Chalmers University of Technology, said: "The sensor we developed is not only the fastest in the world, but its stability will not decrease with time. The Another advantage is that the sensor we designed does not need to be recalibrated frequently because it is protected by a plastic casing. "
There are many challenges in detecting hydrogen. This gas is invisible and has no odor, but is extremely volatile and flammable. Only 4% of hydrogen is needed in the air to form a mixture of hydrogen and oxygen, which can be ignited under a small spark. In order to ensure that hydrogen-fueled vehicles and hydrogen-related infrastructure are sufficiently safe, the designed sensors must be able to quickly and accurately detect a very small amount of hydrogen in the air so that leaks can be quickly detected before a fire occurs.
The researchers said that although the initial design of the sensor application target is to use hydrogen as a carrier of energy, the sensor may also be applied in other aspects. For example, efficient hydrogen sensors are necessary in the power network industry, chemical and nuclear energy industries, and can help improve medical diagnosis.
"The amount of hydrogen in our breath can provide answers to questions such as inflammation and food intolerance. We hope that our research results can be widely applied so that it is no longer just a scientific publication." The team member Christoph · Lanhammer said that in the long run, they hope that the sensors can be jointly produced in an efficient manner, for example, applied to 3D printing technology. (Liu Jianwen)
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Service life:
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Technical index:
|
project |
index |
|
|
drying time,h |
Table dry |
≤6 |
|
action |
≤24 |
|
|
Tensile Strength |
≥9 |
|
|
Bending strength |
≥7 |
|
|
Compressive strength |
≥80 |
|
|
Shore hardness |
≥75 |
|
|
Leveling,cm |
≥16 |
|
|
Wear resistance(750g/500r,weightlessness,g) |
≤0.03 |
|
|
Adhesive strength |
≥2 |
|
|
30% resistant to sulfuric acid |
30 days to allow a slight discoloration |
|
|
25% resistant to sodium chloride |
30 days without exception |
|
|
30% resistant to salt water |
30 days without exception |
|
|
Gas-resistant,I20" |
Resistance |
|
1, the base surface treatment;
2, brushing closed base oil;
3, batch scratch epoxy mortar coating;
4, polished, vacuuming;
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