Title
The Electrochemical Deposition of Sol-Gels for Spectroelectrochemical Sensing
Faculty Mentor(s)
Royce Dansby-Sparks
Location
Special Collections
Start Date
2-4-2013 12:30 PM
End Date
2-4-2013 1:45 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 spatial resolution. This work utilizes indium-tin oxide optically transparent electrodes for electrochemical deposition of sol-gel films. Functionalization can be tailored for chemical selectivity and is 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 Ru(bpy)32+. Deposition parameters were optimized for precursor concentration and film thickness. A flow cell system was designed to test the diffusive effects of Ru(bpy)32+ and for simultaneous collection of electrochemical and optical data. Spectroelectrochemical sensing can be applied for the indirect detection of trace Cr6+.
The Electrochemical Deposition of Sol-Gels for Spectroelectrochemical Sensing
Special Collections
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 spatial resolution. This work utilizes indium-tin oxide optically transparent electrodes for electrochemical deposition of sol-gel films. Functionalization can be tailored for chemical selectivity and is 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 Ru(bpy)32+. Deposition parameters were optimized for precursor concentration and film thickness. A flow cell system was designed to test the diffusive effects of Ru(bpy)32+ and for simultaneous collection of electrochemical and optical data. Spectroelectrochemical sensing can be applied for the indirect detection of trace Cr6+.