Surface-initiated thermal radical polymerization on gold

Citation
Wx. Huang et al., Surface-initiated thermal radical polymerization on gold, LANGMUIR, 17(5), 2001, pp. 1731-1736
Citations number
35
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
LANGMUIR
ISSN journal
0743-7463 → ACNP
Volume
17
Issue
5
Year of publication
2001
Pages
1731 - 1736
Database
ISI
SICI code
0743-7463(20010306)17:5<1731:STRPOG>2.0.ZU;2-F
Abstract
We report surface-initiated thermal radical polymerization from cross linke d monolayers of azo-initiators on Au. Initial attempts to graft polymer lay ers from initiators attached to alkanethiol monolayers yielded polymer film s with thicknesses less than 5 nm. Efficient grafting from such surfaces is not possible because initiator-containing monolayers are somewhat unstable under thermal radical polymerization conditions, and desorbed thiols may s erve as efficient chain-transfer reagents that inhibit radical polymerizati on. In addition, reactive radicals can attack the Au-S bonds that link the initiator monolayer to the surface. To overcome these problems, we employed mercaptopropyltrimethoxysilanes to form an adhesion layer for initiator at tachment. Cross-linked poly(siloxane) layers apparently stabilize the initi ator layer, allowing well-defined surface radical polymerization to occur f rom Au substrates. We characterized the grafted polymer layers with ellipso metry, reflectance Fourier transform infrared spectroscopy, and atomic forc e microscopy.