Influence of the crystallographic orientation on the reductive desorption of self-assembled monolayers on gold electrodes

Doneux, Thomas; Steichen, Marc; Rache, Aurore De; Buess‐Herman, C.

doi:10.1016/j.jelechem.2010.02.032

Cited by 36 publications

(49 citation statements)

References 70 publications

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“…The potential at which the desorption occurs matches the sequence expected from the point of zero charge of the different single-crystal surfaces. [30,50] This result is consistent with the fact that the crystallographic orientation of a gold single crystal affects markedly the formation of self-assembled monolayers. [22,51] Depending on the polycrystal- line electrode, a slight shift in potential is sometimes observed, but as the (111) and (210) faces correspond to the extreme cases, it is assumed that other crystallographic orientations are involved in the broad response.…”

Section: Influence Of Substrate Crystallinitysupporting

confidence: 85%

In Situ Fluorescence Microscopy Study of the Interfacial Inhomogeneity of DNA Mixed Self‐Assembled Monolayers at Gold Electrodes

et al. 2015

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Mixed self‐assembled monolayers composed of a fluorescently labeled DNA and a mercaptobutanol diluent immobilized on gold electrodes were characterized by electrochemical measurements coupled with in situ fluorescence microscopy. The reductive desorption of the self‐assembled monolayers was monitored in real time through variations in the capacitance and fluorescence intensity. Desorption occurred in several steps, which was related to substrate crystallinity. Fluorescence microscopy revealed the presence of spatial heterogeneities in the form of highly fluorescent aggregates that remained at the electrode surface even after a reductive desorption step. This in situ electrofluorescence microscopy technique is useful to optimize the formation of the mixed layer to obtain a homogeneous distribution of the probes, which thus improves the efficiency of the recognition process in the development of biosensors.

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Section: Influence Of Substrate Crystallinitysupporting

confidence: 85%

In Situ Fluorescence Microscopy Study of the Interfacial Inhomogeneity of DNA Mixed Self‐Assembled Monolayers at Gold Electrodes

et al. 2015

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“…Hydrophobic interactions between adjacent naphthoquinones moieties in the monolayer could also contribute to the stability of the SAM. Additionally, due to the polycrystalline nature of the electrode, it is likely that the peak P 3 corresponds solely to the desorption from the (1 1 1) terraces, while species anchored on other surface sites can be desorbed only at more negative potentials [50,52]. This hypothesis was verified by performing reductive desorption experiments on a Au(1 1 1) and on a Au(1 1 0) single crystals (Supplementary data Fig.…”

Section: Behaviour Of the Self-assembled Monolayermentioning

confidence: 79%

Electrochemical investigations of dissolved and surface immobilised 2-amino-1,4-naphthoquinones in aqueous solutions

Bouffier

Lister

Higgins

et al. 2012

Journal of Electroanalytical Chemistry

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“…Intermolecular interactions and packing density were found to be important. 9 The 111 to 110 zone axis shows large changes as well, with the reductive desorption potential remaining at the 111 value These examples show that the smoothly changing dbb or pzc for the Au surface is not a proxy for estimating reductive desorption potentials for those surfaces that are not low index planes. A general trend emerges, that the surface with the more negative E des is correlated with an increase in the step/terrace atom ratio, becoming significant at surfaces that represent a transition between low index planes.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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

Yu¹,

Casanova-Moreno²,

Guryanov

et al. 2014

J. Am. Chem. Soc.

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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 face centered cubic (fcc) surface structures represented by a stereographic projection. Simultaneous analysis of many crystallographic orientations was accomplished through the use of an in situ fluorescence microscopic imaging technique coupled with electrochemical measurements. SAMs were prepared from different classes of molecules, which were modified with a fluorescent tag enabling characterization of the influence of electrical 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 electrical potential of the interface revealing how the organization of these SAMs depend on the surface crystallographic orientation, all in one measurement. This approach allows for a simultaneous determination of SAMs assembled onto an electrode surface onto which the whole fcc stereographic triangle can be mapped, revealing the influence of intermolecular interactions as well as the atomic 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 analysis of a SAM containing two components prepared using thiol exchange. The two component SAM shows remarkable differences in the surface coverage, which strongly depends on the surface crystallography enabling estimates of the thiol exchange energetics. In addition, these electrode surfaces enable studies of molecular adsorption onto the symmetry related chiral surfaces since more than one stereographic triangle can be imaged at the same time. The ability to observe a SAM modified surface that contains many complete fcc stereographic triangles will facilitate the study of the single and multicomponent SAMs, identifying interesting surfaces for further analysis.

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Influence of the crystallographic orientation on the reductive desorption of self-assembled monolayers on gold electrodes

Cited by 36 publications

References 70 publications

In Situ Fluorescence Microscopy Study of the Interfacial Inhomogeneity of DNA Mixed Self‐Assembled Monolayers at Gold Electrodes

In Situ Fluorescence Microscopy Study of the Interfacial Inhomogeneity of DNA Mixed Self‐Assembled Monolayers at Gold Electrodes

Electrochemical investigations of dissolved and surface immobilised 2-amino-1,4-naphthoquinones in aqueous solutions

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

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