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Infrared absorption enhancement of fluorinated poly‐acrylate thin films on Co‐alloy substrate
Author(s) -
Zhang L.,
Oh C. F.
Publication year - 2006
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.2356
Subject(s) - chemisorption , substrate (aquarium) , molecule , cobalt , chemistry , absorption (acoustics) , metal , polymer , photochemistry , adsorption , infrared , blueshift , absorption band , materials science , inorganic chemistry , organic chemistry , composite material , optics , optoelectronics , oceanography , physics , geology , photoluminescence
Fluorinated poly‐acrylate films coated on continuous Co‐based metal substrate show significant IR absorption enhancement. The degree of enhancement depends greatly on the type of chemical bonds in the polymer molecules and the corresponding vibrations of chemical dipoles. Strong polar groups like CO, CF and CO show the strongest absorption enhancement that also coincides with significant blueshift of the corresponding IR bands. In this paper, the possible mechanism for IR absorption enhancement and band shift are discussed on the basis of the electric field intensification on metal surface, charge transfer and dipole reorientation of the polymer molecules adsorbed on the metal surface. Chemisorption of the polymer molecules on Co‐alloy is established through the interaction between the oxygen atoms in carboxylic group and the substrate cobalt atoms reacting through electron overlap and spin‐coupling of oxygen π‐orbital and cobalt d‐orbital. Copyright © 2006 John Wiley & Sons, Ltd.