Electrode Array GK-12 Meeting November 2nd 2010

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Presentation transcript:

Electrode Array GK-12 Meeting November 2nd 2010 Megan Easterly

Electrochemistry Oxidation Reduction Loss of electrons Electrode removes electrons from the solution Anodic peak current Reduction Gain of electrons Electrode gives electrons to the solution Cathodic peak current

Electrodes Working (WE) Reference (RE) Auxillary (AE) Electrolyte Where the reaction of interest occurs Current is measured Reference (RE) Measures WE potential by maintaining a stable potential Auxillary (AE) Electron provider/remover Electrolyte Electrically conductive solution

Gold Electrode Array 8 Au working 1 Au reference 1 Au auxillary 2 3 4 5 6 7 8 aux ref 8 Au working 1 Au reference 1 Au auxillary Study FDCA

Ferrocenedicarboxylic Acid (FDCA) E0 ferrocene = +0.361 V vs. NHE 0.197 MORE positive Bard, A.; Faulkner, L., “Electrochemical Methods. Fundamentals and Applications” 2nd Ed. Wiley, New York. 2001 Image courtesy of Dr. Karst research group: http://www.uni-muenster.de/Chemie.ac/karst/research/projects/hyphenated%20techniques.htm

The Math Randles-Sevcik equation is a collection of constants at 25 oC 0.443 * Fardays constant * universal gas constant Should be linear under a diffusion controlled case Bard, A.; Faulkner, L., “Electrochemical Methods. Fundamentals and Applications” 2nd Ed. Wiley, New York. 2001

Simultaneous Detection External reference and auxillary

Simultaneous Detection Normalized currents to electrode area Linearity > 0.9990 Sensitivity (μA*mm-2*mM-1) Ox 1.43 ± 0.07 Red -1.46 ± 0.07

DPV of FDCA Optimal potential determination Ran individually vs. AgAgCl 0.43 V vs. Au 0.37 V Ran individually

Amperometry of FDCA On-chip reference and auxillary 0.37 V Individual detection

Amperometry of FDCA Normalized to electrode area Linearity Sensitivity > 0.9987 Sensitivity 22.44 ± 12.93 nA*mm-2*mM-1

New Mask Well defined areas Working = 0.09 mm2 Reference = 2.25 mm2 Auxillary = 2.25 mm2 Spacing = 0.3 mm

Future Work Fabrication of new electrode array Chemiluminescence detection of NO donor Calibration of electrodes using NO Modification of Au array Nafion Polypyrrole Diab, N.; Oni, J.; Schulte, A.; Radtke, I.; Blochl, A.; Schuhmann, W., Talanta, 61, 2003, 43-51