Highly sensitive and on-site NO2 SERS sensors operated under ambient conditions

Abstract

Nitrogen dioxide (NO₂) produced by hydrocarbon combustion has a significant adverse impact on human health and the environment. In the current work, we developed a high-performance (limit of detection: 0.1 ppm), on-site, rapid NO₂ gas sensor that could be operated under ambient conditions by combining a highly sensitive 3D porous SERS substrate and a handheld Raman spectrometer.