Characterization of organosulfur monolayer formation at gold electrodes
Date
1996
Authors
Woods, Nina Karman Tani
Major Professor
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Porter, Marc D.
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Abstract
An emphasis of this work is achieving a better understanding of the monolayer formation processes. To probe the mechanisms of monolayer formation, we compare in this paper monolayers derived from three related precursors, butanetpiol, butyl sulfide and butyl disulfide. Our goal is to determine, first, if the same monolayer forms from all three precursors and second, the mechanisms and byproducts of the chemisorption process. The study encompasses a wide variety of techniques, including infrared reflection spectroscopy, electrochemistry, x-ray photoelectron spectroscopy and gas chromatography-mass spectrometry. Based on the characterization results, a scheme for understanding the surface structure of thioctic acid monolayers is discussed. Sulfurderived monolayers are widely used to improve the voltammetric responses of biological molecules [13, 14]. Thus, we have also assessed the feasibility of using thioctic acid monolayers to enhance cytochrome c electrochemistry.
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