Comparative Study of Thymine Adsorption on Cu- and Ag-Adlayers on Au(111) Electrodes
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K.-O. Thiel
The electronic attributes of an electrochemically deposited copper monolayer on Au(111) were compared to its bulk equivalent by XPS experiments. Due to the modified interaction between the Cu-Cu as well as Cu-Au atoms at the surface a core level shift to lower binding energies occurs, which exceeds the values found for surface core level shifts of Cu atoms on Cu(100) surfaces.
It could be shown that the thymine orientation on a copper layer depends on the externally applied potential in analogy to the adsorption behaviour on Au(111) and Ag(111) single crystals. The transition between a chemisorbed and a physisorbed phase occurs around the potential of zero charge. Independently of the adsorption state of thymine the electron density around the surface copper atoms is reduced by the interaction between thymine molecules and the copper surface.
At electrochemically deposited silver monolayers, bilayers as well as at bulk silver on Au(111) different orientations and adsorption states of thymine could be evaluated. A comparison between XPS and electrochemical data reveal an alteration of the thymine–Ag interaction within the chemisorbed thymine layer deposited on 1 ML Ag/Au(111). It is notable that the transformation between the chemisorbed and physisorbed thymine phase does not seem to be dependent on the thickness of the silver adlayers, while the potential of zero charge differs by about 200 mV. In contrast, the onset of the hydrogen evolution shifts to lower potentials with increasing thickness of the Ag layers.
© Oldenbourg Wissenschaftsverlag
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- Voltammetry and Electrocatalysis of Achromobacter Xylosoxidans Copper Nitrite Reductase on Functionalized Au(111)-Electrode Surfaces
- Electrocatalytic Trends on IB Group Metals: The Oxygen Reduction Reaction
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Articles in the same Issue
- Preface: Dieter Kolb zum 65. Geburtstag
- Precursor Adsorption of SbBr3 on Au(111) and Au(100) for Antimony Underpotential Deposition in a BMIBF4 Ionic Liquid – A Comparison with SbCl3
- Electroreduction of Nitrate at Copper Electrodes and Copper-PANI Composite Layers
- Potential Program Invariant Representation of Diffusion–Adsorption Related Voltammograms
- A Way for Determining the Effective Three Phase Boundary Width of Solid State Electrochemical Reactions from the Primary and Secondary Current Distribution at Microelectrodes
- Carbon Nanotubes and Electrochemistry
- Pd3Fe and Pt Monolayer-Modified Pd3Fe Electrocatalysts for Oxygen Reduction
- Electrochemical Nucleation and Growth Kinetics of Nanostructured Gold on Rotating Disc and Stationary Electrodes
- Theoretical Trends in Particle Size Effects for the Oxygen Reduction Reaction
- Metal Deposition by Inducing a Microgalvanic Cell with the Scanning Electrochemical Microscope (SECM)
- Formation of a Molecular Glue Based on the Electrochemical Reduction of 4-Hydroxyphenyldiazonium for the Attachment of Thin Sol–Gel Film on Glassy Carbon
- Confined Spatio-Temporal Chaos During Metal Electrodissolution: Simulations
- Comparative Study of Thymine Adsorption on Cu- and Ag-Adlayers on Au(111) Electrodes
- The Adsorption and Growth of Copper on As-Terminated GaAs(001): Physical Vapour versus Electrochemical Deposition
- Monte Carlo Simulation of Kinetically Limited Electrodeposition on a Surface with Metal Seed Clusters
- Normalized Differential Reflectance Spectroscopy at Polycrystalline Platinum Electrodes in Aqueous Acidic Electrolytes: Quantitative Aspects
- Hydrogen Adsorption on Activated Platinum Electrodes – An Electrochemical Impedance Spectroscopy Study
- Voltammetry and Electrocatalysis of Achromobacter Xylosoxidans Copper Nitrite Reductase on Functionalized Au(111)-Electrode Surfaces
- Electrocatalytic Trends on IB Group Metals: The Oxygen Reduction Reaction
- DFT Studies on the Nature of Coadsorbates on SO42-/Au(111)
- In Situ Scanning Tunnelling Microscopy in Ionic Liquids: Prospects and Challenges
