Date of Award

Fall 1998

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Chemistry & Biochemistry

Program/Concentration

Chemistry

Committee Director

John B. Cooper

Committee Member

Sacharia Albin

Committee Member

Kenneth Brown

Call Number for Print

Special Collections LD4331.C45 J628

Abstract

The micro-array behavior of boron doped CVD diamond thin film electrodes has been studied in acetonitrile containing two redox couples. The analytical technique employed in these studies was cyclic voltammetry. One system is 0.4 mM ferrocene containing 0.1 M tetrabutylammonium hexafluorophosphate (TBAH). This reversible redox system is not only well-known, but also involves only one electron transfer with no breakage/formation of chemical bonds, thus making it a simple system for analysis. The second test is 0.8 mM cobaltocenium hexafluorophosphate, with 0.4 mM ferrocene as an internal standard. Unlike ferrocene, which is neutral initially, cobaltocenium is positively charged, and is reduced at negative potentials. These two systems were used for their simplicity, reversibility, and because of their different charges.

Oxygenated surface sites enhance the determination of Cobaltocenium, a positively charged species, in solution at negative potentials. This enhancement is greater when the oxygenated species are negatively charged. The oxygenated surface sites can result from exposure to atmosphere, exposure to an oxygen plasma, or from organic reactions involving powerful oxidizing agents such as bromine or perchloric acid.

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DOI

10.25777/afmz-0s42

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