Characterization of mixed alcohol monolayers adsorbed onto a Au(111) electrode using electro-fluorescence microscopy

Langmuir : the ACS Journal of Surfaces and Colloids
Jeff L Shepherd, Dan Bizzotto

Abstract

A single-crystal Au(111) electrode modified with an adsorbed layer of 1-octadecanol (C18OH) or oleyl alcohol (OLA) in pure or mixed composition was characterized using electrochemical and in situ fluorescence microscopy. Cyclic voltammetry and differential capacitance measurements revealed a repeatable, potential-induced adsorption/desorption process of the surfactant to/from the electrode surface while charge density and film pressure measurements indicated quasi-ideal mixing of the two adsorbed alcohols. A layer less defective than pure C18OH was created with incorporated OLA. Optical characterization was accomplished using epi-fluorescence microscopy combined with electrochemistry (electro-fluorescence microscopy) through the incorporation of two fluorescent probes into the adsorbed surfactant layer. Since molecular luminescence is quenched by a nearby metal, fluorescence was only observed when the fluorescent dye/alcohol layers were desorbed and therefore separated from the metal surface. When desorbed, the structure of the alcohol layers were similar in character, revealing aggregated features which did not change in morphology over numerous desorption/re-adsorption cycles. We have also used the electro-fluorescence techni...Continue Reading

References

Dec 18, 2001·Biosensors & Bioelectronics·Nirmalya K Chaki, K Vijayamohanan
Jul 1, 2004·Journal of the American Chemical Society·Jeff L ShepherdDan Bizzotto

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Citations

Jul 23, 2013·Methods : a Companion to Methods in Enzymology·Jacques AlbertMaria C Derosa
Jan 28, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Rylan B StolarJeffrey L Shepherd
Jan 16, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Jannu R Casanova-Moreno, Dan Bizzotto
Jun 25, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Amanda MusgroveDan Bizzotto

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