Ionic adsorption at the Au(111) electrode

Lipkowski, Jacek; Shi, Zhichao; Chen, Aicheng; Pettinger, Bruno; Bilger, Christoph

doi:10.1016/s0013-4686(98)00028-0

Cited by 198 publications

(201 citation statements)

References 75 publications

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“…For alkali atoms, the charge-transfer effects along with the substrate-mediated interactions are presumably responsible for an effective repulsive interaction, 14,42,43 while several forces contribute in the case of interhalogen interactions. 16,27,44,45 As it was already mentioned above, the repulsive forces favor the formation of hexagonal monolayers. Therefore the theory developed here would seem to be most suitable for such kind of system.…”

Section: Comparison With Real Experimental Systemsmentioning

confidence: 76%

Analytic theory of hexagonal monolayer interacting with hexagonal substrate

Tkatchenko

2006

Phys. Rev. B

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Analytic theory of the infinite rigid hexagonal monolayer interacting with hexagonal substrate is developed. The interaction potential is described by a Fourier series with up to six shells of the reciprocal cell vectors. It is rigorously shown that energy of minimum structures is directly related to their symmetry, assuming a decaying behavior of Fourier coefficients. Preliminary comparison with real systems of halogens and alkalis adsorbed on metal surfaces is encouraging and indicates that the adsorbate-substrate interaction is one of the main driving forces in the monolayer formation. The need of detailed ab initio calculations to obtain the Fourier coefficients for different complex adsorption systems is emphasized. Our results indicate the importance of accurate description of the adsorbate-substrate interactions for quantitative theory of monolayer epitaxy on well-ordered surfaces.

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Section: Comparison With Real Experimental Systemsmentioning

confidence: 76%

Analytic theory of hexagonal monolayer interacting with hexagonal substrate

Tkatchenko

2006

Phys. Rev. B

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“…The affinity of chloride ions to gold is well known and it is plausible that chloride ions in the elution medium can replace physio-adsorbed fluorescein molecules. [43][44][45][46][47] We therefore hypothesized that in the presence of halides, the release kinetics and loading capacity are dictated by halide-gold interactions. This process can be deconstructed into two key mechanisms: (1) Probability of halide-ions interacting with the gold surface and (2) binding affinity of a halide upon collision with the gold surface.…”

Section: Acs Paragon Plus Environmentmentioning

confidence: 99%

Halide-Gated Molecular Release from Nanoporous Gold Thin Films

Polat

Şeker

2015

J. Phys. Chem. C

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Nanoporous materials have attracted significant attention as drug delivery platforms, in which interfacial phenomena are often more influential than fluid mechanics in defining molecular loading capacity and release kinetics. This study employs nanoporous gold (np-Au) as a model material system to investigate physical mechanisms of molecular release of fluorescein (a small molecule drug surrogate) from the sub-micron-thick np-Au coatings. Specifically, the study reveals an interfacial mechanism where halide ion-gold surface interactions dictate the loading capacity and release kinetics of fluorescein. We systematically study the effect of halide concentration and species on release kinetics from sputter-deposited np-Au films with a combination of quantitative electron microscopy, fluorospectrometry, and electrochemical surface characterization techniques. The results suggest that the interplay of halide-gold interaction probability and affinity determine the nature of release kinetics. The former mechanism plays a more dominant role at higher ionic strengths, while the latter is more important at lower ionic strengths. This interfacial phenomenon is further complemented by functionalizing the np-Au with self-assembled monolayers (SAMs) of alkane-thiols for modulating gold surface-halide affinity and consequently the molecular release kinetics.

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“…This eventually leads to a redistribution of local charges on the surface, changes the surface dipole, and induces a partial charge transfer. (Lipowski et al, 1998;Lorenz & Salie, 1977;Magnussen, 2002) In the absence of any solvation shells surrounding RTILs, the specific adsorption of ions would arguably occur more strongly than in aqueous electrolytes. (Aliaga & Baldelli, 2006;Gale & Osteryoung, 1980) An example of specific adsorption in pure RTILs has been reported for 1-butyl-3-methylimidazolium dicyanamide RTIL on Pt-electrode.…”

Section: Effect Of Speci C Adsorptionmentioning

confidence: 99%

“…Such a steep capacitance curve is typically caused by partial charge transfers at a non-ideally polarized surface, which can be induced by specifically adsorbed ions. (Lipowski et al, 1998;Lorenz & Salie, 1977;Magnussen, 2002;Parsons, 1981) Beyond the ψ 0 -zone, the long-range electrostatic interaction overcomes the short-range effect of specific adsorption to diminish the amount of adsorbed anion on the Fig. 8.…”

Section: Effect Of Speci C Adsorptionmentioning

confidence: 99%