Unraveling spectral shapes of adventitious carbon on gold using a time-resolved high-resolution X-ray photoelectron spectroscopy and principal component analysis

Fernandez, Vincent; Fairley, Neal; Baltrusaitis, Jonas

doi:10.1016/j.apsusc.2020.148031

Unraveling spectral shapes of adventitious carbon on gold using a time-resolved high-resolution X-ray photoelectron spectroscopy and principal component analysis

Journal Article · Thu Oct 01 00:00:00 EDT 2020 · Applied Surface Science

DOI:https://doi.org/10.1016/j.apsusc.2020.148031· OSTI ID:1851704

Fernandez, Vincent ^[1]; Fairley, Neal ^[2]; Baltrusaitis, Jonas ^[3]

Institut des Matériaux Jean Rouxel, Nantes Cedex (France); Lehigh Univ., Bethlehem, PA (United States)
Casa Software Ltd, Devon (United Kingdom)
Lehigh Univ., Bethlehem, PA (United States). Dept. of Chemical and Biomolecular Engineering

To extract chemical information reliably, we propose a new data processing method based both on the creation of information vectors and on a vector base change. The originality of this method is the combination of the different core XPS peaks, Auger and/or valence bands in a single vector. We show that the measurement of a sample upon its progressive chemical change, such as accumulation of the adventitious carbon, allows us to create a new vector basis using linear algebra and Principal Component Analysis. In this work, we demonstrate the application of this method using adventitious carbon films on Au foil utilizing Au 4f, C 1s and O 1s spectral envelopes. This method expands the possibilities of XPS measured chemical environment analysis and is an operator-unbiased solution for materials for which the reference XPS spectra are not available. In this demonstration, the emphasis is placed on identifying changes in a C 1s peak assumed to be adventitious carbon and highlight uncertainties associated with calibrating the binding energy scale using a simple peak model to identify a component C 1s assumed to be saturated hydrocarbon in origin.

View Accepted Manuscript (DOE)

Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012577

OSTI ID:: 1851704

Alternate ID(s):: OSTI ID: 1776969

Journal Information:: Applied Surface Science, Journal Name: Applied Surface Science Journal Issue: C Vol. 538; ISSN 0169-4332

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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