Rensselaer Polytechnic Institute scientists recently developed a slim, cheap and reusable new sensor, which is made of graphene foam, the performance far surpasses the commercially available commercial gas sensor, and, not far from In the future, scientists will be able to develop more excellent bomb detectors and environmental sensors on this basis.
The new sensor has abandoned many of the limitations that prevent the sensor from being used and developed. In recent years, scientists have made significant strides in manipulating nanostructures and using them to create high-performance detectors that accurately track the chemicals in the air. However, the range of sensors they have developed, Theoretically good, but not practical.
At present, the design of the sensor is very complicated, often relying on a single nanostructure, and scientists need to carefully manipulate such a structure and analyze more accurately. In addition, the sensors that are manufactured are often not reusable and must be operated at a specific temperature or pressure. As a result, scientists have not created a reliable, inexpensive, and reusable hand-held sensing device.
Now, researchers at Rensselaer Polytechnic Institute developed a new type of sensor of this stamp size using graphene foam. They planted graphene, a single layer of carbon atoms, on a nickel foam structure and removed the nickel foam, leaving a foam-like graphene structure that has a unique electrical property that can be used to perform sensing tasks.
When exposed to air, particles in the air are absorbed onto the surface of the foam, and each of these particles can affect the graphene foam in a different manner with minor changes in its resistance. By passing the current through it and measuring the change in resistance, you know what particles are attached to the foam. Scientists let about 100 milliamps of current through the foam, and found that the graphene foam can lead to desorption of particles, that is, the particles automatically peel off the sensor, remove the particles, the sensor can be reused.
Scientists fine-tune the sensor to detect ammonia (a key component of the homemade explosives ammonium nitrate) that managed to detect this offensive particle in 5 minutes to 10 minutes, and the efficiency Is 10 times the best detector on the market today. Scientists then use it to detect the toxic gas, nitrogen dioxide, which is also released when the explosives decompose, and the results show that it is also 10 times more efficient than current commercial sensors.
Graphene foam is very easy to handle and easy to operate, but also work well at room temperature, which are very desirable characteristics of scientists, the graphene foam sensor allows scientists to create cheaper and more practical hand-held transmission Sense equipment to detect the atmosphere.
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