30 January 2012 MFI-type zeolite functional liquid phase sensor coated on the optical fiber end-face
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Proceedings Volume 8351, Third Asia Pacific Optical Sensors Conference; 83512K (2012) https://doi.org/10.1117/12.915941
Event: Asia Pacific Optical Sensors Conference, 2012, Sydney, Australia
Optical fibers are a unique medium to coat with functional sensor materials that change in refractive index upon adsorption/interaction with specific compounds. In this work, we demonstrate a simple technique to coat the end face of an optical fiber with the microporous MFI-type zeolite. The exposure of the zeolite films from air to water or to aqueous solutions of ethanol and isopropanol causes a distinct change in the film's refractive index. This change was then detected using a simple fiber optic refractive index sensor by monitoring the signal intensity reflected back from the coated fiber endface and as the zeolite is transferred between air, water and solutions containing ethanol and isopropanol. The zeolite coating was developed using the in-situ templated growth technique to grow the zeolite crystals on the cleaved endface of an optical fiber. Effective coating was achieved when the fiber was oriented horizontally in the hydrothermal reactor. The zeolite coated end face reflected less energy in water, at 0.0201 μW, and exhibited almost no change (~2% increase) with increasing ethanol concentration, but exhibited a 135% increase in reflected energy, i.e. 0.048 μW, in 100% ethanol. The zeolite therefore gave the sensor alcohol selectivity. Further work is exploring applicability for liquid phase chemical and water quality analysis.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yaoxin Hu, Yaoxin Hu, Fotios Sidiroglou, Fotios Sidiroglou, Matthew R. Hill, Matthew R. Hill, Stephen F. Collins, Stephen F. Collins, Mikel Duke, Mikel Duke, } "MFI-type zeolite functional liquid phase sensor coated on the optical fiber end-face", Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 83512K (30 January 2012); doi: 10.1117/12.915941; https://doi.org/10.1117/12.915941

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