Title

Indirect Optical and Electrochemical Detection of Trace Metals at Electrodeposited Sol-gel Films

Faculty Mentor(s)

Royce Dansby-Sparks

Proposal Type

Poster

Location

Open 3rd Floor

Start Date

4-4-2013 4:30 PM

End Date

4-4-2013 6:00 PM

Description/Abstract

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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Apr 4th, 4:30 PM Apr 4th, 6:00 PM

Indirect Optical and Electrochemical Detection of Trace Metals at Electrodeposited Sol-gel Films

Open 3rd Floor

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.