Title

Physical and electrochemical analyses of spin coated hexaammineruthenium(III)/ Nafion/ITO electrodes for heavy metal detection

Date of Publication

2016

Document Type

Master's Thesis

Degree Name

Master of Science in Physics

Subject Categories

Physics

College

College of Science

Department/Unit

Physics

Thesis Adviser

Shirley T. Palisoc

Defense Panel Chair

Julita C. Robles

Defense Panel Member

Christopher T. Que
Armando S. Somintac

Abstract/Summary

Varying concentrations of hexaammineruthenium (III), [Ru(NH3)6]3+- Nafion®, films were spin coated on indium tin oxide (ITO)-coated glass substrates. The coating solutions were diluted with ethanol, methanol, or isopropanol. The effects of the solvent type, [Ru(NH3)6]3+ or RuHex concentration, and spin rate on the morphology and transport properties of the fabrication electrodes were investigated. Surface micrographs revealed the presence of sub-micron grooves that diminished with increased RuHex concentration. The surface morphology of the electrodes, however, was independent of the spin rate. The viscosity, η, for all 3 solvent types has an inverse power, n = -0.5, proportionality with RuHex concentration, x i.e. {u1D702}={u1D45A}{u1D465}−0.5. Isopropanol diluted solutions were more viscous than ethanol and methanol diluted solutions with the latter being the least viscous. 75mgRuHex/30mL concentrations were prone to become semi-solid gel suspensions. Cyclic voltammetry determined that 50mgRuHex/30mL, isopropanol-diluted solution, spin coated at 2000rpm yielded the best electrode. The optimized electrodes were used to detect lead and cadmium in yellow and pink pigments obtained from commercially available water colors and mask paint.

Abstract Format

html

Language

English

Format

Electronic

Accession Number

CDTG006417

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

1 computer optical disc ; 4 3/4 in.

Keywords

Electrochemical analysis; Electrodes; Metal detectors

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