Fig. 7
From: MOF/Polymer-Integrated Multi-Hotspot Mid-Infrared Nanoantennas for Sensitive Detection of CO2 Gas
Dynamic behavior of sensing platforms. a Real-time 3D plots of the differential spectra of platforms using PEI-coated nanorods, b PEI-coated multi-hotspot antennas, and c MOF-PEI-functionalized multi-hotspot antennas, when CO2 gases with various concentrations are loaded and thermally desorbed. d Temporal variation in the total molecular signal corresponding to (a-c), revealing the dynamic behavior of various platforms. i: PEI-coated nanorod platform; ii: PEI-coated multi-hotspot platform; iii: MOF-PEI-functionalized multi-hotspot platform. e Performance comparison corresponding to (d). i: spectral signal intensity of platforms after loading 10 ppm CO2 gas; ii: spectral signal intensity after loading 100 ppm CO2 gas; iii: sensitivity comparison