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Spectroelectrochemical sensing provides three simultaneous modes of enhanced selectivity: chemically selective films, spectroscopy, and electrochemistry. Chemically selective sol-gels films are particularly useful in applications demanding optical transparency. Sol-gels have traditionally been deposited by means of spin or dip coating, limiting their use in applications where spatial resolution is desired. This work utilizes indium-tin oxide optically transparent electrodes for electrochemical deposition of pyridine functionalized sol-gel films. Functionalization can be tailored for chemical selectivity and sol-gels are deposited locally where potential is applied to catalyze sol-gel formation. The system studied in this work provides tri-modal selectivity by means of charge exclusion, electrochemical activity, and/or optical properties of the redox probe, Ru(bpy)32+. Spectroelectrochemical sensing can be applied for the indirect detection of ppb level Cr6+ based on pH dependent charge exclusion properties of the sol-gel films.


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  • Event location
    • Open 3rd Floor

  • Event date
    • 4 April 2013

  • Date submitted

    18 July 2022

  • Additional information
    • Acknowledgements:

      Royce Dansby-Sparks