Monolayers of 11-trichlorosilylundecyl thioacetate: A system that promotes adhesion between silicon dioxide and evaporated gold
Source abstract
Abstract
The use of sulfur-containing organic monolayer films improves adhesion between gold and silicon dioxide. The structures of these monolayers were analyzed using contact angle, ellipsometry, and XPS. The zone of adhesive failure was at or near the gold-monolayer interface.
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Research context
OpenAlex topics: Molecular Junctions and Nanostructures · Force Microscopy Techniques and Applications · Polymer Surface Interaction Studies
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References (36)
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1. 29Since the monolayers prepared from HTS were longer than those created from 1, the Au/C ratio exaggerates the difference in the amount of gold left on these surfaces. Comparisons to the Si 2p signal, which underestimates this difference, indicate that at least six times as much gold was left on the thiol-terminated interface as on the methyl-terminated one.
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3. 21The thioacetate was subjected to acidic rather than basic hydrolysis since monolayers from alkyltrichlorosilanes are not stable in base.
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32. 27We do not know whether this binding energy indicates the presence of a thiol or of a disulfide. The difference in the binding energies of the S 2p electrons in a thiol (163.3 eV) and a disulfide (163.0 eV) is small. Values for the S 2s electrons are expected to differ by similar amounts. The difference in these binding energies is similar to the errors in our reference peaks. See Refs. 13 and 26.
33. 28Adhesive failure for the thiol-terminated monolayers occurred, on average, in ̃15% of the total area covered by the tape. On individual samples failure was found over 2-50% of the surface. For the thio-acetate-terminated monolayers, failure occurred only on 25% of the samples and removed gold from less than 1% of the area covered by the tape. We believe that this difference in failure rates probably reflects contamination of the thiol interface during the hydrolysis of the thioacetate group.
34. 31The binding energy of the sulfur in the thiol-terminated mono-layer (228.4 eV) was between that of the sulfur in the thioacetate group (228.7 eV) and that of the sulfur in the thiol bound to the gold (228.0 eV). Uncertainties in the reference peaks were, however, almost as large as this shift.
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