XPS characterization of Au (core)/SiO(sub 2) (shell) nanoparticles

Article Abstract:

A case is reported where Au (core)/SiO(sub 2) (shell) nanoparticles with a well-defined and characterized structure were analyzed by X-ray photoelectron spectroscopy (XPS). The conclusions obtained were that XPS intensity ratio of peaks from elements of the core and the shell is independent of electron takeoff angle and bulk data are not reliable for explaining the composition, size, geometry of nanoparticles.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Gold Compounds, Usage, Optical properties, Photoelectron spectroscopy, Chemical properties, Nanoparticles

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Time-resolved XPS analysis of the SiO2/Si system in the millisecond range

Article Abstract:

A time-resolved XPS spectrum, in the millisecond range, can be recorded by implementing voltage pulses applied externally to the sample rod in order. This is used to investigate the charging/discharging of the oxide layer on silicon and the gold clusters on top of them and also to extract the important parameters related to dielectric properties of surface structure.

Oxides, Surface chemistry

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Nonlinear absorption spectrum in MEH-PPV/chloroform solution: a competition between two-photon and saturated absorption processes

Article Abstract:

The degenerate nonlinear absorption spectrum was measured in the MEH-PPV/chloroform solution by using the Z-scan technique with femtosecond laser pulses. The competition between two-photon (2PA) and saturated absorption (SA) is explained with the help of energy-level diagrams.

All Other Basic Organic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, Chloroform, Measurement, Differential equations, Nonlinear, Nonlinear differential equations

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