Detection of nitric oxide (NO) is important for monitoring air quality because the NO released in the combustion of fossil fuels contributes to acid rain and smog. In medicine, NO is an important messenger molecule and serves as a biomarker for asthma. A research team reports a material that can detect NO reversibly, with low power, and with high sensitivity and selectivity: a copper-containing, electrically conducting, two-dimensional metal--organic framework.
