Electron spectra line shape analysis of highly oriented pyrolytic graphite and nanocrystalline diamond.
The X-ray excited Auger electron spectroscopy (XAES), X-ray photoelectron spectroscopy (XPS) and elastic peak electron spectroscopy (EPES) methods were applied in investigating samples of nanocrystalline diamond and highly oriented pyrolytic graphite of various C sp(2)/sp(3) ratios, crystallinity conditions and grain sizes. The composition at the surface was estimated from the XPS. The C sp(2)/sp(3) ratio was evaluated from the width of the XAES first derivative C KLL spectra and from fitting of XPS C 1s spectra into components. The pattern recognition (PR) method applied for analyzing the spectra line shapes exhibited high accuracy in distinguishing different carbon materials. The PR method was found to be a potentially useful approach for identification, especially important for technological applications in fields of materials engineering and for controlling the chemical reaction products during synthesis.
Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland. blo@ichf.edu.pl
Beata
B
Lesiak
Josef
J
Zemek
Jana
J
Houdkova
Alexander
A
Kromka
Adam
A
Józwik
D002244:Carbon / Q000737:chemistry*; D018130:Diamond / Q000737:chemistry*; D004583:Electrons; D006108:Graphite / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D010363:Pattern Recognition, Automated; D013057:Spectrum Analysis; D013499:Surface Properties
C009139:pyrolytic carbon; D002244:Carbon; D018130:Diamond; D006108:Graphite