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.
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.