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Planar Integrated Optical Waveguide Sensor for Isopropyl Alcohol in Aqueous Media

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Abstract

An attenuated total reflection (ATR) sensor for water-miscible organic solvents was constructed using a combination of sol-gel processing and integrated optical waveguide (IOW) technologies. The sensor consisted of single-mode, sol-gel based planar waveguide coated with a 40 nm thick, porous sol-gel indicator layer prepared from methyltriethoxysilane and doped with methyl red. The response of the senor to aqueous isopropyl alcohol (IPA) was investigated. Solvation of the indicator dye by IPA causes the absorbance spectrum to undergo a blue shift coupled with an increase in molar absorptivity. IPA was detected by measuring changes in ATR of the guided mode at 488 nm. A response curve extending from 1 to 100% (v/v) IPA in water was constructed for the sensor, from which a detection limit of 0.7% (v/v) IPA/water was estimated. Response and reversal times were typically less than one minute, making this sensor potentially attractive for on-line monitoring applications. The rapid response characteristics are attributable to relatively weak, reversible interactions between the indicator and analyte.

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Authors and Affiliations

  1. Department of Chemistry, University of Arizona, Tucson, AZ, 85721-0041, USA

    Peter J. Skrdla, Neal R. Armstrong & S. Scott Saavedra

  2. Department of Chemistry and Optical Sciences Center, University of Arizona, Tucson, AZ 85721-0041, USA

    Sergio B. Mendes & Neal R. Armstrong

Authors
  1. Peter J. Skrdla
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  2. Sergio B. Mendes
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  3. Neal R. Armstrong
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  4. S. Scott Saavedra
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Skrdla, P.J., Mendes, S.B., Armstrong, N.R. et al. Planar Integrated Optical Waveguide Sensor for Isopropyl Alcohol in Aqueous Media. Journal of Sol-Gel Science and Technology 24, 167–173 (2002). https://doi.org/10.1023/A:1015256211417

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  • DOI: https://doi.org/10.1023/A:1015256211417

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