Nitrogen dioxide is a colorless and odorless greenhouse gas dangerous to humans. Scientists have created an energy-intensive ultra-thin sensor that will protect against dangerous oxide.
Nitrogen dioxide is released into the air from fossil fuel vehicles and gas stoves. It is harmful not only to the climate, but also to human health. Long-term exposure to NO₂ is associated with an increase in the incidence of heart and respiratory diseases. It should be noted that the greenhouse effect of NO₂ is 300 times higher than that of CO₂, which makes it one of the most dangerous gases.
Nitrogen dioxide is odorless and invisible, so a special sensor is needed to detect the gas. It must accurately detect hazardous concentrations of toxic gas. The problem is that most of the sensors available today are energy intensive. They operate at high temperatures to achieve proper performance.
Ultra-thin sensor developed by a group of researchers from the National Laboratory. Lawrence (Berkeley Lab) and the University of California at Berkeley can solve this problem.
In their article published in the journal Nano Letters, the research team talked about an atomically thin 2D sensor. Its peculiarity is that it works at room temperature and, therefore, consumes less energy than analogs. The authors of the development emphasize that the device, created from a single layer alloy of rhenium disulfide and niobium, also has excellent chemical specificity and recovery time.
Unlike other 2D devices made from materials such as graphene, the new sensor reacts selectively to nitrogen dioxide molecules with minimal response to other toxic gases such as ammonia and formaldehyde. In addition, it is capable of detecting ultra-low nitrogen dioxide concentrations of at least 50 ppb.