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 has the potential to provide 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.

Indirect optical and electrochemical detection of trace metals at electrodeposited sol-gel films

245th National Meeting (2013)

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