Ultramicroelectrodes Electroanalytical Chemistr Lecture #7 22-Feb-211
22-Feb-21 1 Ultramicroelectrodes Electroanalytical Chemistry Lecture #7
UMES Geometries ◆Disk ◆ Recessed disk C.S. Henry: I Fritsch Anal. Chem 199971.550-6. ◆Band Cylinder ◆ Materials Carbon fiber
UME’s Geometries Disk Recessed disk C.S. Henry; I. Fritsch Anal. Chem. 1999, 71, 550-6. Band Cylinder Materials Carbon fiber
UME's- Advantages ◆ Reduced capacitance ◆ Low iR drop
UME’s - Advantages Reduced capacitance Low iR drop
UMES- Disadvantages ◆ Noise Electrochemical Fouling ◆ Analyte Method of electrode prep'n(epoxy) Stray capacitance ◆ Impurities ◆ Maintenance ◆Cost ◆ fragile construction
UME’s - Disadvantages Noise Electrochemical Fouling Analyte Method of electrode prep’n (epoxy) Stray capacitance Impurities Maintenance Cost Fragile construction
UME's- Applications ◆ Determine[ analyte ◆ Study reactions at low temperatures frozen glasses o in solvents of moderate to high permittivity W/o electrolyte in solvents of high resistance ◆ in solid state ◆ in gas phase
UME’s - Applications Determine [analyte] Study reactions at low temperatures = frozen glasses in solvents of moderate to high permittivity w/o electrolyte in solvents of high resistance in solid state in gas phase