2 research outputs found
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
The
use of a single crystal gold bead electrode is demonstrated
for characterization of self-assembled monolayers (SAM)Âs 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
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
The
use of a single crystal gold bead electrode is demonstrated
for characterization of self-assembled monolayers (SAM)Âs 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