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Related Experiment Videos

Integrated optical NIR-evanescent wave absorbance sensorfor chemical analysis.

J Bürck1, B Zimmermann, J Mayer

  • 1Forschungszentrum Karlsruhe, Technik und Umwelt, Institut für Radiochemie, P.O. Box 3640, D-76021, Karlsruhe, Germany.

Analytical and Bioanalytical Chemistry
|January 1, 1996
PubMed
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A new integrated optical sensor uses a silicone polymer layer to detect non-polar organic contaminants in water and air. This evanescent field absorbance sensor shows significantly enhanced sensitivity for detecting substances like trichloroethene.

Area of Science:

  • Optoelectronics
  • Chemical Sensing
  • Materials Science

Background:

  • Non-polar organic contaminants pose environmental and health risks.
  • Existing detection methods may lack sensitivity or require complex sample preparation.
  • Integrated optical (IO) sensors offer potential for sensitive and selective analyte detection.

Purpose of the Study:

  • To develop and characterize a novel long-path integrated optical (IO) sensor for detecting non-polar organic substances.
  • To investigate the use of silicone polymers as sensing layers for evanescent field absorbance (EFA) measurements.
  • To evaluate the sensor's performance in detecting trichloroethene (TCE) in both aqueous and gas phases.

Main Methods:

  • Fabrication of a planar multimode IO structure with a silicone polymer sensing layer.

Related Experiment Videos

  • Utilizing evanescent wave interactions with analytes enriched in the silicone layer.
  • Performing evanescent field absorbance (EFA) spectroscopy using a tungsten-halogen lamp and InGaAs spectrograph.
  • Testing different silicone polymers (polysiloxanes) with varying refractive indices (RI).

    • Main Results:

    • The IO sensor successfully detected trichloroethene (TCE) in aqueous samples despite water micro-emulsion formation.
    • Sensor sensitivity for TCE in the gas phase increased by a factor of 10 when using a higher RI silicone layer (1.449 vs. 1.41).
    • The IO-EFA sensor demonstrated up to 120 times higher sensitivity per unit length compared to a previous fiber-optic EFA sensor for TCE gas detection.

    Conclusions:

    • The developed long-path IO-EFA sensor is a promising tool for sensitive detection of non-polar organic contaminants.
    • Silicone polymer properties, particularly refractive index, can be tuned to optimize sensor performance.
    • The IO-EFA approach offers significant advantages in sensitivity and efficiency for environmental monitoring applications.