Infrared spectroscopic study of a γ-mercaptopropyltrimethoxysilane monolayer on a gold surface
- 1 January 1999
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 9 (7) , 1507-1510
- https://doi.org/10.1039/a903577j
Abstract
Reflectance-absorption infrared spectra of γ-mercaptopropyltrimethoxysilane (γ-MPT) adsorbed on Au (111)-oriented films are analyzed on the basis of the calculated vibrational modes of a monomer, a dimer and n-membered rings of SiO 3 R (R=CH 2 CH 2 CH 2 SAu). The results show that the γ-MPT molecules adsorbed on the Au surface are partially hydrolyzed and that the orientation of the methyl groups and propyl chains are near perpendicular to the surface. After a hydrolysis procedure, the SiO 3 groups in γ-MPT form a quasi two-dimensional system built predominantly of 6-membered puckered Si-O rings. Additional treatment of the γ-MPT monolayer with a surface-charge-reversing cationic polymer disrupts the connectivity and increases the topological disorder in the silicate system.Keywords
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