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1. #CASA XPS PEAK FITTING DOUBLE INTENSITY OF ONE PEAK FULL#
2. #CASA XPS PEAK FITTING DOUBLE INTENSITY OF ONE PEAK FREE#

This phenomenon is based on collective oscillations of free electrons excited by the electromagnetic field of light. The principle of some of these sensors is the resonant enhancement of a local electromagnetic field as well as a sharp spectral absorption, which can be achieved by exploiting localized surface plasmon resonance (LSPR).

In the last decade there has been significant development in sensor-related research regarding the application in optical, medical or biological areas. Keywords: dewetting finite-difference time-domain (FDTD) method plasmon resonance silver (Ag) nanostructures thin films UV–vis absorption This led to a very good agreement with the experiment.

#CASA XPS PEAK FITTING DOUBLE INTENSITY OF ONE PEAK FULL#

For calculations a novel approach based on modelling the whole sample with a realistic shape of the nanoparticles, instead of full spheres, was used. Absorbance and the distribution of the electromagnetic field around the nanostructures are calculated by finite-difference time-domain (FDTD) simulations. For calculations leading to a better illustration of absorption, scattering and overall absorption of light in Ag nanoparticles, the Mie theory is employed. As the initial layer thickness increases, an additional peak appears around 350 nm, which probably corresponds to the quadrupole resonance. The absorption spectrum is dominated by a maximum in the range of 450–500 nm associated with the plasmon resonance. The quality of the nanostructures, in terms of their use as plasmonic platforms, is reflected in the UV–vis absorption spectra. The Ag 3d and Ag 4d XPS spectra are characteristic of nanostructures. SEM images show that the formation of nanostructures is influenced by the initial layer thickness as well as the temperature and the time of annealing. Structure and morphology were studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS). Ag-based plasmonic nanostructures were manufactured by thermal annealing of thin metallic films.