Chemical deposition and characterization of thin polypyrrole films on glass plates: role of organosilane treatment |
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Authors: | C Perruchot M M Chehimi M Delamar E Cabet-Deliry B Miksa S Slomkowski M A Khan S P Armes |
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Institution: | (1) ITODYS Université Paris 7 – CNRS (UPRESA7086) 1 rue Guy de la Brosse, 75005 Paris, France e-mail: chehimi@paris7.jussieu.fr Fax: +33-1-44276814, FR;(2) Laboratoire d'Electrochimie Moléculaire Université Paris 7, 2 place Jussieu 75005 Paris, France, FR;(3) Center of Molecular and Macromolecular Studies, Sienkiewicza 112 Lodz 90-363, Poland, PL;(4) School of Chemistry Physics and Environmental Science University of Sussex Brighton BN1 9QJ, UK, GB |
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Abstract: | Thin chloride-doped polypyrrole films (PPyCl) were deposited chemically onto untreated and silane-treated planar glass plates
from aqueous solutions. The organosilanes used to treat the glass substrates were methyltriethoxysilane (Cl), propyltrimethoxysilane
(C3), octyltrimethoxysilane (C8) and aminopropyltriethoxysilane (APS). The decreasing order of hydrophobic character of silane-treated
glass slides, as measured by water contact angle measurements, was glass–APS ≅ glass–C8 > glass–C3 > glass–C1 > glass. X-ray
photoelectron spectroscopy was used to determine the surface chemical composition of the glass plates before and following
coating with the silane coupling agents and/or the PPy thin layer, respectively. The attenuation in intensity of the glass
Na1
s
peak enabled the average thickness of the various organosilane overlayers to be estimated. Atomic force microscopy showed
that the morphology of the organosilane overlayers was islandlike. The domains have a structure which depends upon the nature
of the organosilane in question. Scanning electron microscope images showed that the morphology of the PPyCl thin films was
homogeneous when coated onto glass–APS and glass–C8, but wrinkled at the surface of glass, glass–C1 and glass–C3 plates. Qualitative
peel tests using 3M adhesive tape showed very good adhesion of PPyCl to the glass–APS substrate, whereas adhesion was fairly
poor in the case of glass–PPy and PPy–alkylsilane–glass interfaces. The results of this multitechnique study suggest that
hydrophobic interactions are important to obtain homogeneous and continuous thin PPy films, but Lewis acid–base interactions
are the driving forces for strong and durable PPy–glass adhesion.
Received: 3 January 2000/Accepted: 19 May 2000 |
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Keywords: | Polypyrrole Glass Organosilanes Wettability Hydrophobic interactions |
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