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High-pressure ammonia adsorption and dissociation of clean Fe(111) and oxygen-recovered Fe(111) studied by sum frequency generation vibrational spectroscopy

Article Abstract:

The adsorption of gases that play a role in ammonia synthesis is studied on the Fe(111) crystal surface by sum frequency generation (SFG) vibrational spectroscopy using an integrated ultrahigh vacuum/high pressure system. The result reveals that heating the surface in the presence of high-pressure ammonia reduces the oxygen coverage, and there is another relative phase change of 180 degree to restore the initial spectral features.

Spectra, Iron compounds, Chemical synthesis, Vibrational spectra

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Pt nanocrystals: Shape control and Langmuir-Blodgett monolayer formation

Article Abstract:

The study reports the synthesis of monodisperse Pt nanocrystals with three different shapes-cubes, cuboctahedra, and octahedra, selectively, with similar sizes of 9-10 nm by a modified polyol process. It is found that addition of silver ion enhances the crystals growth rate along (100), and essentially determines the shape and surface structure of the Pt nanocrystals.

Optical properties, Monomolecular films, Platinum compounds

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Methane dissociative adsorption on the Pt(111) surface over the 300-500 K temperature and 1-10 Torr pressure ranges

Article Abstract:

The dissociative adsorption of methane on the Pt(111) surface is investigated and characterized over the 1-10 Torr pressure and 300-500 K temperature ranges. The calculations of C-H bond dissociation probabilities for methane are found to be in the 10(super -8) range and increase with increasing reaction temperature.

Analysis, Methane, Thermal properties, Adsorption, Chemical bonds, Chemical properties

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