Sensors are an important tool for obtaining information and play a huge role in industrial production, national defense construction and science and technology. The development of nanomaterials has promoted the birth of nanosensors, greatly enriched the theory of sensors, and broadened the application fields of sensors.
Nanosensors are widely used in biology, chemistry, machinery, aviation, military and so on. Some experts pointed out that by 2020, when human society enters the “post-silicon era”, nanosensors will become the mainstream. Therefore, it is of great significance to speed up the development of nanosensors and even the whole nanotechnology.
- Nano sensor is used for the inspection of dangerous goods
The days of having to rely on large lab analyzers and specialized police dogs to spot spoiled food, suspected explosives, and dangerous goods may be gone. Researchers have developed an odor-sensitive nanosensor that could drastically reduce the cost and time of substance detection.
- Nanosensors are used to detect pesticide residues in fruits and vegetables
Regarding the pesticide residues in fruits and vegetables, use this kind of test paper to test, and you can see at a glance whether there are pesticide residues and how many indicators are there; even some human health indicators can be transformed into visible and tangible intuitive presentations by using biosensors. Nano-gold material is the core material of nano-sensors and is widely used in test strips and test boxes. Its size, shape and self-assembly behavior directly affect the performance of visualization.
- Nanosensors are used in national defense technology
In national defense technology, nano gas sensors are used in the ground, space, aircraft, submarine cabins, and various military vehicle cabs to detect harmful gases, toxic gases, etc., which are more convenient, fast and sensitive. For example, the United States has developed Out of the nano military uniform, the nano sensor in the military uniform can sense the change of biochemical indicators in the air. When the harmful gas or substance index suddenly rises, the military uniform will immediately close the vents of the helmet and other ventilation parts, and release the antidote of the biochemical weapon , play a preventive effect.
- Nanosensors are used to detect harmful gases in the air
Harmful gas detection is a major function of gas sensors. The detection of harmful gases has two purposes, the first is explosion detection, and the second is poison detection. The so-called explosion detection is to detect the content of combustible gas in dangerous places, and alarm if it exceeds the standard, so as to avoid explosion accidents; the poison detection is to detect the content of toxic gas in dangerous places, and alarm if it exceeds the standard, so as to avoid staff poisoning.
There are three kinds of harmful gases: first, non-toxic or low-toxic and flammable; second, non-flammable and toxic; third, flammable and toxic. For these three different situations, generally we need to choose different gas sensors when choosing sensors.
In the research of nano gas sensor, one of the main directions is to make gas sensor by relying on the change of the conductance of sensitive material in the gas environment. The incorporation of noble metal nanoparticles (such as Pt and Pd) in these nanosensitive materials greatly enhances the selectivity, increases the sensitivity, and lowers the operating temperature.
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