Aqueous contaminant detection via UiO-66 thin film optical fiber sensor platform with fast Fourier transform based spectrum analysis

Marziyeh Nazari, Marta Rubio-Martinez, Ravichandar Babarao, Adel Ayad Younis, Stephen F. Collins, Matthew R. Hill, Mikel C. Duke

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Routine water quality monitoring is required in drinking and waste water management. A particular interest is to measure concentrations of a range of diverse contaminants on-site or remotely in real time. Here we present metal organic framework (MOF) integrated optical fiber sensor that allows for rapid optical measurement based on fast Fourier transform (FFT) spectrum analysis. The end-face of these glass optical fibers was modified with UiO-66(Zr) MOF thin film by in situ hydrothermal synthesis for the detection of the model contaminants, Rhodamine-B and 4-Aminopyridine, in water. The sensing mechanism is based on the change in the optical path length of the thin film induced by the adsorption of chemical molecules by UiO-66. Using FFT analysis, various modes of interaction (physical and chemical) became apparent, showing both irreversible changes upon contact with the contaminant, as well as reversible changes according to actual concentration. This was indicated by the second harmonic elevation to a certain level translating to high sensitivity detection.

Original languageEnglish
Article number025601
Number of pages8
JournalJournal of Physics D: Applied Physics
Issue number2
Publication statusPublished - 17 Jan 2018


  • fast Fourier transform (FFT) spectrum analysis
  • metal organic frameworks (MOFs)
  • optical fiber chemical sensors
  • specific organic contaminant detection
  • water quality monitoring

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