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Single fiber-optic pH sensor based on changes in reflection accompanying polymer swelling

Z Shakhsher1, W R Seitz, K D Legg

  • 1Department of Chemistry, University of New Hampshire, Durham 03824.

Analytical Chemistry
|May 15, 1994
PubMed
Summary

We developed a novel fiber-optic pH sensor using aminated polystyrene. This robust sensor shows significant changes in light reflection with pH variations, offering a new tool for chemical sensing.

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Optical Engineering

Background:

  • Accurate and sensitive pH monitoring is crucial in various scientific and industrial applications.
  • Existing pH sensing technologies often face limitations in size, stability, or response time.
  • Development of novel optical pH sensors can offer advantages in specific environments.

Purpose of the Study:

  • To develop and characterize a new fiber-optic pH sensor.
  • To investigate the optical properties of aminated polystyrene in response to pH changes.
  • To assess the sensor's performance, including stability and response time.

Main Methods:

  • Fabrication of the sensor by dip-coating aminated polystyrene onto an optical fiber tip.
  • Incorporation of porosity using xylene/dodecane and toughening with Kraton G1652.

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  • Characterization of sensor response to varying pH levels (8.0 to 6.5) by measuring reflected light intensity.
  • Evaluation of mechanical stability and response time.

    • Main Results:

    • The aminated polystyrene polymer swells upon protonation of amine groups.
    • Sensor clarity increases and reflected light intensity decreases as pH drops from 8.0 to 6.5.
    • Reflected light intensity decreased by over a factor of 2 within this pH range.
    • The sensor demonstrated mechanical stability and a response time of several minutes.

    Conclusions:

    • A functional fiber-optic pH sensor based on aminated polystyrene has been successfully prepared.
    • The sensor exhibits a measurable optical response to pH changes due to polymer swelling and altered optical properties.
    • The developed sensor is compact, mechanically stable, and suitable for applications requiring pH monitoring.