A CO2optical sensor based on self-assembled metal–organic framework nanoparticles

An optical CO₂sensor is fabricated by integration of a self-assembled, transparent film of zeolitic imidazolate framework-8 (ZIF-8) nanoparticles onto bimodal optical waveguides. This sensor shows a limit of detection (LOD) of 774 ppm CO₂, is robust, fast and reusable, and can be stored under humid conditions with no loss in performance.