Premium
Anchoring of sulfur‐containing alkylphosphonic and semifluorinated alkylphosphonic molecules on a polycrystalline aluminum substrate
Author(s) -
Fonder G.,
Delhalle J.,
Essahli M.,
Ameduri B.,
Mekhalif Z.
Publication year - 2008
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.2762
Subject(s) - chemistry , x ray photoelectron spectroscopy , molecule , sulfur , infrared spectroscopy , crystallite , surface modification , substrate (aquarium) , inorganic chemistry , organic chemistry , crystallography , chemical engineering , oceanography , engineering , geology
Self‐assembly on a polycrystalline aluminum substrate of two sulfur‐containing alkylphosphonic acids, CH 3 (CH 2 ) 11 S (CH 2 ) 2 PO(OH) 2 , and CF 3 (CF 2 ) 7 (CH 2 ) 2 S(CH 2 ) 2 PO(OH) 2 , has been compared with CH 3 (CH 2 ) 15 PO(OH) 2 . The reaction of the phosphonic head groups with the hydroxyls at the alumina surface to form phosphonates was studied with X‐ray photoelectron spectroscopy (XPS) and polarization modulation infrared reflection‐absorption spectroscopy (PM‐IRRAS). Barrier effects of the resulting layers was assessed by electrochemical polarization curves. With the conditions used in the present work for the self‐assembly reaction, it appears that the sulfur‐containing molecules do not perform as well as CH 3 (CH 2 ) 15 PO(OH) 2 in terms of film quality. Questions are raised about the possibility that the sulfur‐containing molecules could undergo cleavage during surface modification. Copyright © 2008 John Wiley & Sons, Ltd.