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Identification of the carbonaceous residues at nickel and platinum surfaces on the basis of the carbon KLL spectra
Author(s) -
Lesiak B.,
Jablonski A.,
Palczewska W.,
KulszewiczBajer I.,
Zagórska M.
Publication year - 1992
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740180610
Subject(s) - platinum , nickel , chemistry , carbon fibers , spectral line , analytical chemistry (journal) , environmental chemistry , materials science , organic chemistry , catalysis , physics , composite material , astronomy , composite number
Interaction of carbon compounds with transition metal surfaces results, under appropriate conditions, in the formation of a number of carbon‐containing species of different character. In the present work, the pattern recognition method (the k‐nearest neighbour rule) together with AES was applied to study the carbonaceous residues after adsorption of acetylene and ethylene at the surface of polycrystalline nickel and platinum. The above method identifies the residues by comparison to different samples of polyacetylenes. Identification is based on analysis of the KLL Auger spectra shape recorded for carbon atoms. As hypothetical oligomers, polyacetylenes with different conjugation lengths were chosen (7–105 Å). The applied method confirmed that ethylene and acetylene oligomerize at the nickel surface. Carbonaceous residues were recognized as the polyacetylenes with the longest conjugation lengths (105 Å). At the platinum surface the oligomerization process was also observed, but to a much smaller extent (average conjugation length equal to 15 Å).