According to a recent report from the US "Popular Science" website, scientists at Rensselaer Polytechnic Institute have recently developed a new sensor that is slim, cheap, and reusable. It is made of graphene foam, and its performance is far higher than the current market. Commercial gas sensors, and, in the near future, scientists can develop more excellent bomb detectors and environmental sensors on this basis.
The new sensor abandons many restrictions that prevent the application and development of sensors. In recent years, scientists have made significant progress in manipulating nanostructures and using them to manufacture detectors with excellent performance to accurately track chemicals in the air. However, they have developed various sensors, although It is good in theory, but not practical.
Current sensor designs are very complex, often relying on a single nanostructure, and scientists need to carefully manipulate and more accurately analyze such structures. In addition, the manufactured sensors are often not reusable, and must work at a specific temperature or pressure. Therefore, scientists have not produced a reliable, cheap, and reusable handheld sensor device.
Now, scientists at Rensselaer Polytechnic Institute have developed a new sensor the size of a postage stamp using graphene foam. They planted graphene, a single layer of carbon atoms, on a foamed nickel structure, and then removed the foamed nickel, leaving a foam-like graphene structure with unique electrical properties that can be used to perform sensing tasks.
When exposed to air, the particles in the air will be absorbed onto the surface of the foam, and each such particle will affect the graphene foam in a different way, making small changes to its resistance. By passing a current through it and measuring the change in resistance, you can know what particles are attached to the foam. Scientists let a current of about 100 milliamps pass through the foam. It was found that the graphene foam can cause particles to desorb, that is, the particles are automatically peeled off from the sensor to remove these particles, and the sensor can be reused.
Scientists fine-tuned the sensor to detect ammonia (a key component of homemade explosives ammonia nitrate). The graphene foam sensor managed to detect this aggressive particle in 5 to 10 minutes, and the efficiency It is 10 times the best detector on the market. Scientists then used it to detect the toxic gas nitrogen dioxide (which is also released when explosives are decomposed), and the results show that its efficiency is 10 times that of current commercial sensors.
Graphene foam is very easy to handle and easy to operate, and also works well at room temperature. This is a characteristic that scientists are very fond of. This graphene foam sensor allows scientists to quickly make cheaper and more practical handheld transmission Sensing equipment to detect the atmosphere.
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