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RESEARCH PRODUCT
Formation and Characterization of Self-Assembled Films of Thiol-Derivatized Poly(Dimethylsiloxane) on Gold
John F. RaboltHelmut RingsdorfKarl Heinz PfeiferMei Wei TsaoLukas HäusslingDavid G. Castnersubject
Materials sciencePolymers and PlasticsOrganic ChemistryPropanethiolInorganic ChemistryContact anglechemistry.chemical_compoundchemistryChemical engineeringX-ray photoelectron spectroscopyChemisorptionEllipsometryPolymer chemistryMaterials ChemistrySide chainSelf-assemblyWettingdescription
Poly(dimethylsiloxane) (PDMS) copolymers containing propanethiol side chain “stickers” for forming self-assembled films on gold surfaces have been studied by various experimental techniques including ellipsometry, contact angle measurements, FT-IR, angle-dependent XPS, and ToF−SIMS. The results show that the thiol-containing side chains do not all chemisorb to the gold surfaces. In addition, the concentration of these sticker units was found to have a dominant effect on the polymer film thickness, the surface wetting properties, and the orientation of the PDMS backbone. Ab initio calculations reveal that the IR-active PDMS Si−O stretching bands can be used as indications of chain orientation, and a comparison of the calculated spectra with grazing incidence reflection IR data shows that the self-assembled PDMS backbone is predominantly aligned parallel to the surface, plausibly as a result of the chemisorption.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-09-01 | Macromolecules |