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Surface Analysis of Plasma‐Deposited Polymer Films, 3
Author(s) -
Oran Umut,
Swaraj Sufal,
Friedrich Jörg F.,
Unger Wolfgang E. S.
Publication year - 2004
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.200400025
Subject(s) - ethylene , plasma , analytical chemistry (journal) , oxygen , ion , chemistry , secondary ion mass spectrometry , mass spectrum , polymer , radical , materials science , chromatography , organic chemistry , physics , quantum mechanics , catalysis
Summary: Pulsed‐plasma‐deposited ethylene films were studied by time‐of‐flight static secondary ion mass spectrometry (ToF‐SSIMS) before and after exposure to ambient air. The influence of the external plasma parameters on the secondary ion mass spectra of plasma‐deposited ethylene films was investigated. From these data, information on the chemical character of the plasma‐deposited ethylene films was derived. The investigation of the effect of external plasma parameters on the chemical character of the plasma‐deposited ethylene films revealed that there were some drastic changes in the secondary ion mass spectra of the films. It was found that fragmentation and re‐arrangement of the monomer molecules in the plasma, which affects the chemical character of the deposited films, vary according to the external plasma parameters. When the plasma polymers are exposed to air, extensive oxygen incorporation occurs. The oxygen uptake is high at the beginning and then it levels of. Some indications for the formation and decay of peroxy radicals (COO • ) and, subsequently, hydroperoxides (COOH) are found. It was observed that the oxygen uptake of the plasma deposited ethylene films increase when the plasma conditions become harder.Intensity ratios [ m / z 12 − /14 − (C − /CH 2 − )] for plasma‐deposited ethylene samples versus duty cycle. Note that the unsaturated character increases with increasing m / z 12 − /14 − (C − /CH 2 − ) intensity ratios.