MFI-type zeolite functional liquid phase sensor coated on the optical fiber end-face

Yaoxin Hu, Fotios Sidiroglou, Matthew R. Hill, Stephen F. Collins, Mikel Duke

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

Abstract

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.

Original languageEnglish
Title of host publicationThird Asia Pacific Optical Sensors Conference
PublisherSPIE
Number of pages6
Volume8351
ISBN (Print)9780819490278
DOIs
Publication statusPublished - 2012
Externally publishedYes
EventAsia-Pacific Optical Sensors Conference 2012 - Sydney, Australia
Duration: 31 Jan 20123 Feb 2012
Conference number: 3rd
http://www.apos2012.org/
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/8351.toc

Conference

ConferenceAsia-Pacific Optical Sensors Conference 2012
Abbreviated titleAPOS 2012
CountryAustralia
CitySydney
Period31/01/123/02/12
OtherPROCEEDINGS VOLUME 8351
ASIA PACIFIC OPTICAL SENSORS CONFERENCE | 31 JANUARY - 3 FEBRUARY 2012
Third Asia Pacific Optical Sensors Conference
Internet address

Keywords

  • chemical sensing
  • Optical fiber
  • water quality sensing
  • zeolite

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