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[ Instrument network instrument research and development ] Scientists from the University of Sussex, together with Oxford-based M-SOLV and European researchers, have developed a gas sensor that can provide NO2 content in affordable portable IoT devices With accurate readings, the device can be synchronized with smartphones and apps.
NO2 comes from internal combustion engines and industrial processes. Long-term exposure to pollutants can cause respiratory diseases. It is especially serious for infants and asthma patients, and even life-threatening.
IMechE called for the adoption of a new clean air bill to deal with the bad health caused by air pollution.
European Union regulations stipulate that the 20 parts per million threshold of NO2 in the air cannot exceed 18 times a year. The monthly average level in London is often higher than this level, but currently only awkward and expensive equipment can monitor air quality to prevent exposure to ppb levels. According to the University of Sussex, the team’s breakthrough was that they developed a laser-deposited carbon aerogel (LDCA)-based NO2 sensing layer. They found that the sensing layer is more selective for NO2 than other common air pollutants. .
Then, using a scalable and economical single-step laser process, the porous, thin and well-adhered LDCA film is deposited on the Electrode, which is then housed in a series of equipment structures for continuous air monitoring. The sensor is said to be very sensitive, can detect nearly two parts per billion of NO2 within 15 minutes, and can operate at room temperature and humid conditions.
Professor Alan Dalton, head of the Materials Physics Group at the University of Sussex, said: “Like condensation on window glass, the carbon and other nanomaterials we use in this development almost always have a surface. Water. Usually, this is a very bad thing because it interferes with the technology, but in this case, we have been able to use this layer of water to selectively dissolve NO2, rather than normally found under environmental conditions Of other volatiles.
"As a physicist, this is really exciting, because it makes our sensors highly sensitive to NO2 under realistic conditions, thus avoiding false alarms."
Potential applications of the sensor may include: as a safety device for monitoring the air quality in a baby's bedroom; helping to inform the best walking or cycling route and time to avoid high pollution levels. Scientists hope that the technology will be used by parliament to track pollution levels in the urban environment and industry.
Adam Brunton, Business Development Director of M-SOLV, who is producing NO2 sensing equipment, said: "The good thing about this sensor is that it is made of Oxford using familiar equipment and materials that we already have in a large-area electronics manufacturing clean factory. This means that it is compatible with standard smartphone manufacturing technology and can be easily integrated with processing electronics, wireless communications, mobile networks, etc. Therefore, remote access to data from a single device or a huge network of these sensors is a very simple the process of."