On April 28, 2022, Du, Chuanshen; Andino, Richard S.; Rotondaro, Matthew C.; Devlin, Shane W.; Erramilli, Shyamsunder; Ziegler, Lawrence D.; Thuo, Martin M. published an article.Formula: C10H22S The title of the article was Substrate Roughness and Tilt Angle Dependence of Sum-Frequency Generation Odd-Even Effects in Self-Assembled Monolayers. And the article contained the following:
Role of substrate type, gold or silver, and surface roughness on the parity odd-even effect in n-alkanethiolate (n = 10-16) self-assembled monolayers (SAMs), materials of potential importance to mol. scale electronics, is studied using vibrational sum-frequency generation (SFG) spectroscopy. An inverted odd-even effect is observed for SAMs on Ag substrates relative to SAMs on Au. The metal-specific SFG spectra in the Me and methylene stretching regions provide a sensitive probe of the in situ cant angle and mol. twist dependence of the interfacial group orientation. Within the precision of these measurements, disorder due to gauche defects is not evident in this spectral anal. SFG Me vibrational frequencies and line widths show parity and substrate dependence. Metal substrate roughness, an under-reported exptl. parameter, affects the extent of odd-even Me orientation anisotropy. Parity-dependent Me orientation effects are seen on Ag beyond the roughness limit established by hydrophobicity data on Au. The SFG anal. predicts an ~2.8 nm rms roughness limit for odd-even effects on Ag substrates. These SFG results further confirm the role competing pairwise short-range dispersive (∝1/r6) and longer range polar (∝1/r to 1/r4) interactions play in controlling the observed odd-even wetting behavior of SAMs on metal substrates as a function of surface roughness. The experimental process involved the reaction of 1-Decanethiol(cas: 143-10-2).Formula: C10H22S
The Article related to surface roughness wetting self assembly monolayer gold silver thiol, Surface Chemistry and Colloids: Solid-Gas Systems and other aspects.Formula: C10H22S
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