Use of electroactive thiols to study the formation and exchange of alkanethiol monolayers on gold

Collard, David M.; Fox, Marye Anne

doi:10.1021/la00054a029

Cited by 271 publications

(246 citation statements)

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“…The resulting surface coverage was calculated from the area under the voltammetric peak as the scan rate is varied in the range 0.1-2 V s -1 , and was found to be 4.64 × 10 -11 mol/cm 2 . This value is about one order of magnitude smaller than those reported in literature for alkanethiol SAMs on Au(111) [72][73][74]. However, it is not surprising, since the steric hindrance It is interesting to note that the peak separation E p is greater than 0 and slightly increases with increasing scan rates (50 mV at 1 V/s as compared to 30 mV at 100 mV/s).…”

Section: Photophysical Characterization In Solutionmentioning

confidence: 56%

Luminescent acetylthiol derivative tripodal osmium(II) and iridium(III) complexes: Spectroscopy in solution and on surfaces

Ramachandra

Polo

Edafe

et al. 2011

Pure and Applied Chemistry

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Luminescent Os(II) and Ir(III) complexes containing a tripodal-type structure terminalized with three thiol derivatives are described. The tripod is introduced through derivatization, with a rigid spacer, of a phenanthroline ligand coordinated to the metal ion, and the entire structure possesses axial geometry. The geometry of the complexes combined with the three anchoring sites, the thiol groups, allows the complexes to adopt an almost perpendicular arrangement to the surfaces and the formation of a well-packed monolayer on Au substrates. The photophysical and electrochemical behavior of the complexes is studied in solution and on surfaces. Furthermore, a self-assembled monolayer (SAM) of Os(II) complexes on an ultraflat Au surface is used to fabricate a metal–molecule–metal junction with Au and In Ga eutectic as electrodes. The Os(II) SAM in the tunneling junction exhibits rectification behavior which is opposite in direction to that which we have previously shown for Ru(II) SAMs.

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Section: Photophysical Characterization In Solutionmentioning

confidence: 56%

Luminescent acetylthiol derivative tripodal osmium(II) and iridium(III) complexes: Spectroscopy in solution and on surfaces

Ramachandra

Polo

Edafe

et al. 2011

Pure and Applied Chemistry

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“…• C for 2 h only, in order to limit the exchange between thiol species as detailed elsewhere [18,19].…”

Section: Fabrication Of Nanopatterned Gold Surfacesmentioning

confidence: 99%

Nanopatterned self-assembled monolayers

Baralia

Pallandre²,

Nysten

et al. 2006

Nanotechnology

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We report on the fabrication of chemically nanopatterned gold surfaces by combining electron-beam lithography with gas and liquid phase thiolization. The line-edge roughness of the patterns is ∼4 nm, corresponding to a limiting feature size in the range of 15 nm. Indications for a lower packing density of the self-assembled monolayers grown in the nanofeatures are given, and evidences for the bleeding of thiols along the grain boundaries of the gold substrate are displayed. A comparison is provided between nanopatterned thiol and silane monolayers on gold and on silicon wafers, respectively. The line-edge roughnesses are shown to be close to each other for these two systems, indicating that the limiting step is currently the lithography step, suggesting possible improvement of the resolution. The advantages and drawbacks of thiol versus silane monolayers are finally discussed with respect to the formation of chemically nanopatterned surfaces. M Supplementary data files are available from stacks.iop.org/Nano/17/1160

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“…10 The voltammograms shown in Figure 2a reveal a trend towards an increasing faradaic current for Ru(NH 3 ) 6 Cl 3 reduction over time through β-CD-induced pores in the SAM. Since the SAM formed for 10 minutes in a pure nhexadecanethiol solution yields a largely passive electrode for electron transfer (see Figure 1c), we believe that the initial contact of the gold surface with the β-CD/n-hexadecanethiol mixed solution results in a high surface concentration of n-hexadecanethiol, which is being replaced slowly by thiolated β-CD as time goes on.…”

Section: Resultsmentioning

confidence: 96%

“…2, [8][9][10] The dynamic nature of the equilibrium has been demonstrated by exchange reactions such as the exchange of n-alkanethiols with ferrocene-labeled alkanethiols 8 and self-exchange of isotopically labeled compounds. 10 The voltammograms shown in Figure 2a reveal a trend towards an increasing faradaic current for Ru(NH 3 ) 6 Cl 3 reduction over time through β-CD-induced pores in the SAM.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Characterization of Nanosized Electrode Arrays Prepared from Nanoporous Self-Assembled Monolayers

2002

Bulletin of the Korean Chemical Society

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We characterized nanoelectrode arrays prepared from self-assembled monolayers (SAMs) by adsorption from a solution containing thiolated β-cyclodextrin (β-CD) and n-alkanethiol on the gold electrode surface, using electrochemical methods. While the framework, the n-hexadecanethiol SAM, effectively blocked electron transfer between the electrode surface and solution-phase redox probe molecules, the β-CD cavities isolated in the forests of n-hexadecanethiol molecules were shown to act as an ultramicroelectrode array. The shapes of cyclic voltammograms of probe molecules were related to the number densities of β-CD molecules within the monolayer films. Probe molecules that have the correct combination of physical and chemical characteristics were shown to effectively penetrate the framework through the β-CD pores and exchange electrons with the electrode surface.

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Use of electroactive thiols to study the formation and exchange of alkanethiol monolayers on gold

Cited by 271 publications

References 0 publications

Luminescent acetylthiol derivative tripodal osmium(II) and iridium(III) complexes: Spectroscopy in solution and on surfaces

Luminescent acetylthiol derivative tripodal osmium(II) and iridium(III) complexes: Spectroscopy in solution and on surfaces

Nanopatterned self-assembled monolayers

Electrochemical Characterization of Nanosized Electrode Arrays Prepared from Nanoporous Self-Assembled Monolayers

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