Title: Ultrathin polymer films on gold surfaces through activation of Si-H bonds
Authors : Hirayama, Martina
Caseri, Walter
Suter, Ulrich
Published in : Journal of Colloid and Interface Science
Issue : 216
Pages : 250
Publisher / Ed. Institution : Science Academic Press
Publisher / Ed. Institution: Cambridge
Issue Date: 1999
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Coating; Nanolayer; Polymer; Gold
Subject (DDC) : 540: Chemistry
Abstract: Several poly(siloxane)s and a poly(silazane) were bound to gold surfaces by activation of Si-H bonds with cis-[PtCl2(PhCH=CH2)2]. Under the reaction conditions used here, absorption of the poly(siloxane)s is observed exclusively in presence of the platinum compound. The resulting ultrathin layers were studied with IR spectroscopy at grazing incidence reflection, X-ray photoelectron spectroscopy (XPS), contact angle measurements and ellipsometry. The layer thicknesses (2.9-5.2 nm) are in the typical range of polymer monolayers adsorbed on gold. The wetting properties of the modified gold substrates correspond to those of the pure polymers, indicating that the gold is covered to a high extent or completely with polymer. The highest contact angles of water (115°) were observed with Si-H-terminated poly(dimethylsiloxane) and are among the highest reported for an ultrathin layer on gold. We assume that the activator cleaves Si-H bonds. The polymers might be bound to the surface by Au-Si bonds or via Pt-Si species.
Departement: School of Engineering
Publication type: Article in scientific Journal
ISSN: 0021-9797
URI: https://digitalcollection.zhaw.ch/handle/11475/3023
Appears in Collections:Publikationen School of Engineering

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