Journal ArticleDOI
Coadsorption of ferrocene-terminated and unsubstituted alkanethiols on gold: electroactive self-assembled monolayers
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TLDR
In this paper, a self-assembled monolayer with low concentrations of alkanethiols linked to ferrocene by a polar ester group (FcCO{sub 2}(CH{sub n}SH, Fc = ({eta}{sup 5}-C{sub 5}H{sub 4}Fe }) showed thermodynamically ideal surface electrochemistry.Abstract:
Self-assembled monolayers provide an ideal system for disentangling the fundamental events in interfacial electron transfer. Coadsorption of ferrocene-terminated alkanethiols with unsubstituted n-alkanethiols on evaporated gold films yields stable, electroactive self-assembled monolayers. Monolayers containing low concentrations of alkanethiols linked to ferrocene by a polar ester group (FcCO{sub 2}(CH{sub 2}){sub n}SH, Fc = ({eta}{sup 5}-C{sub 5}H{sub 5})Fe({eta}{sup 5}-C{sub 5}H{sub 4})) show thermodynamically ideal surface electrochemistry in 1 M HClO{sub 4}, indicating the ferrocene groups to be homogeneous and noninteracting. Higher surface concentrations or use of alkanethiols linked directly to the nonpolar ferrocene group (Fc(CH{sub 2}){sub n}SH) lead to broadened electrochemical features, indicating interactions among ferrocene groups or inhomogeneous sites. Longer chain lengths and lower ferrocene surface concentrations result in slower electron-transfer kinetics with the ferrocene groups. A fraction of the thiols in a monolayer exchange with thiols in an ethanol solution, but much of the monolayer remains unequilibrated after 10 days.read more
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Journal ArticleDOI
Self-assembled monolayers of thiolates on metals as a form of nanotechnology.
Journal ArticleDOI
Formation and Structure of Self-Assembled Monolayers.
TL;DR: Monolayers of alkanethiolates on gold are probably the most studied SAMs to date and offer the needed design flexibility, both at the individual molecular and at the material levels, and offer a vehicle for investigation of specific interactions at interfaces, and of the effect of increasing molecular complexity on the structure and stability of two-dimensional assemblies.
Journal ArticleDOI
Free Energy and Temperature Dependence of Electron Transfer at the Metal-Electrolyte Interface
TL;DR: The rate constant of the electron-transfer reaction between a gold electrode and an electroactive ferrocene group has been measured at a structurally well-defined metal-electrolyte interface at temperatures from 1� to 47�C and reaction free energies from -1.0 to +0.8 electron volts.
Journal ArticleDOI
The electrochemical desorption of n-alkanethiol monolayers from polycrystalline Au and Ag electrodes
TL;DR: In this article, the surface coverage of the oxidized n-alkanethiol species is shown to be 9.3×10−10 mol/cm2 and 7.0 × 10−10 cm2 on Au and Ag, respectively.
Journal ArticleDOI
Patterning self-assembled monolayers
TL;DR: In this paper, the authors introduce patterned features into both self-assembling monolayers and the substrates that support them as the parameters controlling SAM formation and dynamics are better understood.