Analysis of surface structures using XPS with external stimuli
Date
2006Publisher
Springer, Dordrecht
Pages
45 - 58
Language
English
Type
Book ChapterItem Usage Stats
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Book Title
Surface chemistry in biomedical and environmental science
Abstract
X-ray Photoelectron Spectroscopy, XPS, due to the perfect match of its
probe length (1-10 nm) to nanoparticle size, chemical specificity, and susceptibility to electrical charges, is ideally suited for harvesting chemical, physical and
electrical information from nanosized surface structures. In addition, by recording
XPS spectra while applying external d.c. and/or pulsed voltage stimuli, it is also
possible to control the extent of charging and extract various analytical
information. In the simplest form, application of a static (d.c.) voltage stimuli
enhances separation of otherwise overlapping peaks of gold nanoparticles from
that of metallic gold. When the voltage stimuli is applied in the form of
rectangular pulses, dynamic information is obtained from the frequency
dependence of the charging shifts. This enables us to better probe the composition
of nanoparticles produced (i.e. silicide formation, or whether or the extent of
reduction, etc.) when platinum salt is deposited on silicon substrates. Finally, by
recording the data in different time windows, XPS spectra can be recorded in
time-resolved fashion. Time-resolved spectra can be used to detect, locate and
quantify the charges developed in various surface structures like gold(core)/
silica(shell) nanoparticles on a copper substrate.
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http://hdl.handle.net/11693/50857Published Version (Please cite this version)
https://doi.org/10.1007/1-4020-4741-X_5https://doi.org/10.1007/1-4020-4741-X