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Waveguide surface plasmon resonance sensor for electrochemically controlled surface reactions.

J C Abanulo, R D Harris, P N Bartlett

    Applied Optics
    |March 28, 2008
    PubMed
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    Integrated optical surface plasmon resonance (IOSPR) monitored gold surface oxidation during electrochemical analysis. This technique shows promise for developing sensitive electrochemical sensors.

    Area of Science:

    • Electrochemistry
    • Optical Sensing
    • Materials Science

    Background:

    • Surface plasmon resonance (SPR) is a powerful optical sensing technique.
    • Electrochemical methods are widely used for surface analysis and modification.
    • Integrating optical and electrochemical techniques can offer synergistic benefits.

    Purpose of the Study:

    • To investigate the electrochemical oxidation of a thin gold film on an optical waveguide.
    • To monitor the process using integrated optical surface plasmon resonance (IOSPR) coupled with cyclic voltammetry.
    • To assess the potential of IOSPR for sensitive detection of electroactive species.

    Main Methods:

    • Utilized a thin gold film deposited on an optical waveguide.
    • Employed cyclic voltammetry to control and monitor electrochemical reactions.

    Related Experiment Videos

  • Integrated optical surface plasmon resonance (IOSPR) to measure changes in waveguide transmittance.
  • Performed experiments in a sulfuric acid solution.

    • Main Results:

    • Waveguide transmittance showed a strong correlation with charge transfer during gold surface oxidation and reduction.
    • A significant 60% reduction in transmittance was observed upon complete formation of the gold surface oxide.
    • Demonstrated the feasibility of combining IOSPR with electrochemical measurements.

    Conclusions:

    • IOSPR coupled with electrochemical techniques provides a sensitive method for monitoring surface oxidation.
    • The integrated approach shows potential for developing robust multisensors for electroactive species.
    • This study highlights the utility of IOSPR in electrochemical surface analysis.