Physical and chemical reaction sensing in a mixed aqueous solution via metal-organic framework thin-film coated optical fiber

A metal-organic framework thin-film (UiO-66) optical fiber platform is built up as a data processing sensory system to detect water contaminations. A simple scale-up approach is utilized to design a water-stable UiO-66 sensor at the tip (end face) of a conventional single mode optical fiber (SMF-28) for detecting rhodamine-B and methyl viologen in a mixed aqueous solution. The optical detection method was based on Fabry-Perot Interferometry, and the interference signal was analyzed by the fast Fourier transform (FFT) technique. Combining two contaminants in water produces a complex physical and chemical phenomena, and the FFT clearly showed it as a particular frequency related to a specific analyte type.