Researchers presented a small highly sensitive and accurate nitrogen dioxide sensor (NO2), which can be used in homes, public places and industrial conditions.
Nitrogen dioxide is a poisonous gas and one of the main air pollutants, which can cause breathing problems among babies and people with asthma. Its main sources are internal combustion engines and some production processes. Most countries have strict values of the permissible concentration of NO2 in the air, the excess of which is allowed only a few times a year, but in large cities these indicators are constantly overestimated.
The low level of resolved concentration further complicates the ubiquitous air quality control, since at present this analysis can be carried out only with the help of cumbersome and expensive equipment. Therefore, scientists from the University of Susseki engaged in creating a convenient and affordable device, which would suit for widespread use.
They have committed a breakthrough, developing sensitive to nitrogen dioxide film based on carbon aerogel, besieged by a laser. After applying a thin layer of material on the electrode, the natural moisture on the surface improves the interaction of the aerogel with NO2, which makes it possible to determine its concentration in the air up to 10 molecules per billion. Rain and fog practically do not affect the efficiency of the device.
According to the team, such a sensor can be connected to the Internet of things to monitor air quality in the smart city system, install a child or hospital ward in the bedroom, as well as use to analyze the level of contamination of the area during the sale of real estate.
Recall that Recently, Ford reported on the development
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