Exploring three-dimensional nanosystems with Raman spectroscopy: Methylene blue adsorbed on thiol and sulfur monolayers on gold

Article Abstract:

Resonant Raman and surface-enhanced Raman scattering (SERS) spectroscopies, complemented with scanning tunnel microscopy and electrochemical techniques are used to obtain information about the amount and spatial distribution of methylene blue (MB) molecules immobilized on sulfur and four ultrathin molecular alkanethiolate films. The decrease in the SERS intensity as a function of distance for the rough Au electrodes is used to locate the average position of the MB species with respect to the Au substrate.

Gold Compounds, Spectra, Raman spectroscopy, Raman effect

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Room-temperature kinetics of short-chain alkanethiol film growth on Ag(111) from the vapor phase

Article Abstract:

Time-of-flight (TOF) direct recoiling spectroscopy (DRS) is used to follow propanethiol adsorption at 300 K from the vapor phase on an Ag(111) surface, for exposures ranging from 10(super -1) to 10(super 5) L. The results show that the adsorption proceeds with changes in the sticking coefficient, consistent with three phases.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Silver, Vapor-plating, Vapor deposition, Films (Materials), Vapour deposition

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Electrochemical self-assembly of alkanethiolate molecules on Ni(111) and polycrystalline Ni surfaces

Article Abstract:

The electrochemical formation of alkanethiolate self-assembled monolayers (SAMs) on Ni(111) and polycrystalline Ni surfaces is studied. Results indicate that alkanethiolates adsorb on Ni concurrent with NiO electroreduction, which takes place at a fixed potential range irrespective of hydrocarbon chain length.

Nickel Compounds, Design and construction, Monomolecular films, Alkanes, Polycrystalline semiconductors

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