Stability of thiol-passivated gold particles at elevated temperatures studied by X-ray photoelectron spectroscopy

Article Abstract:

The thermal stability of thiol-passivated gold colloids are studied by means of X-ray photoelectron spectroscopy and different colloids were chemically synthesized with thiol lengths from 3 to 8, and 16 carbon atoms. Temperature-dependent measurements revealed a general tendency of shells with longer thiol chains to be more stable in terms of desorption but to show X-ray radiation-induced damage, which was absent with shorter thiols.

All Other Basic Organic Chemical Manufacturing, Industrial Organic Chemicals, Mercaptans, Photoelectron spectroscopy, Thiols, Carbon compounds

---

Activation of Au/y-Al2O3 catalysts for CO oxidation: characterization by X-ray absorption near edge structure and temperature programmed reduction

Article Abstract:

The preparation of gold catalysts supported on gama-Al2O3 (Au/gama-Al2O3) by deposition-participation of aqueous HAuCL4 and by deposition of Au(CH3)2(acac) from pentane solution is described. It is stated that the samples are characterized by in situ XANES and temperature-programmed reduction and by their performance as CO oxidation catalysts at room temperature.

Usage, Absorption spectra

---

Gold nanostructures from cube-shaped crystalline intermediates

Article Abstract:

An alternate approach for producing nanostructures based on the formation of a crystalline intermediate in which the metal ion can be reduced in a controlled manner is described. Partial reduction of HAu[Cl.sub.4] by a long chain amine results in the formation of a cube shaped crystalline intermediate, in which Au is present in a+1 oxidation state.

Observations, Nanotechnology, X-rays, X-ray diffraction, Transmission electron microscopes, Structure

Similar abstracts:

• Abstracts: Determination of H adsorption sites on Pt/C electrodes in HCIO4 from Pt L23 X-ray absorption spectroscopy
• Abstracts: Lateral diffusion of the reconstituted dialkyl viologen monolayer at the air/water interface studied with electrochemistry
• Abstracts: Surface behavior of alumina-supported Pt catalysts modified with cerium as revealed by X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy of CO adsorption
• Abstracts: Charge carrier dynamics of standard TiO2 catalysts revealed by femtosecond diffuse reflectance spectroscopy. Size-dependent optical properties of polydiacetylene nanocrystal
• Abstracts: Micropolarity and order in the reverse micelles of L62 and L64 pluronic copolymers, as studied by molecular probe techniques

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.