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Influence of Surface Structure on Single or Mixed Component Self-Assembled Monolayers via in Situ Spectroelectrochemical Fluorescence Imaging of the Complete Stereographic Triangle on a Single Crystal Au Bead Electrode

TitleInfluence of Surface Structure on Single or Mixed Component Self-Assembled Monolayers via in Situ Spectroelectrochemical Fluorescence Imaging of the Complete Stereographic Triangle on a Single Crystal Au Bead Electrode
Publication TypeJournal Article
Year of Publication2015
AuthorsYu, ZLandis, Casanova-Moreno, J, Guryanov, I, Maran, F, Bizzotto, D
JournalJ. Am. Chem. Soc
Volume137
Pagination276–288
Date Publishedjan
Abstract

The use of a single crystal gold bead electrode is demonstrated for characterization of self-assembled monolayers (SAM)s formed on the bead surface expressing a complete set of fcc. (fcc) surface structures represented by a stereog. projection. Simultaneous anal. of many crystallog. orientations was accomplished through the use of an in situ fluorescence microscopic imaging technique coupled with electrochem. measurements. SAMs were prepd. from different classes of mols., which were modified with a fluorescent tag enabling characterization of the influence of elec. potential and a direct comparison of the influence of surface structure on SAMs adsorbed onto low index, vicinal and chiral surfaces. The assembly of alkylthiol, Aib peptide and DNA SAMs are studied as a function of the elec. potential of the interface revealing how the organization of these SAMs depend on the surface crystallog. orientation, all in one measurement. This approach allows for a simultaneous detn. of SAMs assembled onto an electrode surface onto which the whole fcc stereog. triangle can be mapped, revealing the influence of intermol. interactions as well as the at. arrangement of the substrate. Moreover, this method enables study of the influence of the Au surface atom arrangement on SAMs that were created and analyzed, both under identical conditions, something that can be challenging for the typical studies of this kind using individual gold single crystal electrodes. Also demonstrated is the anal. of a SAM contg. two components prepd. using thiol exchange. The two component SAM shows remarkable differences in the surface coverage, which strongly depends on the surface crystallog. enabling ests. of the thiol exchange energetics. In addn., these electrode surfaces enable studies of mol. adsorption onto the symmetry related chiral surfaces since more than one stereog. triangle can be imaged at the same time. The ability to observe a SAM modified surface that contains many complete fcc stereog. triangles will facilitate the study of the single and multicomponent SAMs, identifying interesting surfaces for further anal. [on SciFinder(R)]

URLhttp://pubs.acs.org/doi/abs/10.1021/ja5104475
DOI10.1021/ja5104475