Metal organic framework structure was used to design and organize smart nanosensors.

Multiple functional components were made into nanoparticles for sensing and scavenging of NO₂⁻${{\text{NO}}_2}^{-}$.

Well-designed combination led to specific detection of NO₂⁻${{\text{NO}}_2}^{-}$ via preset mechanism.

Tb³⁺-luminescent nanoparticles are impervious to autofluorescence of biosamples.