Improved Strain Relief of Self-Assembled Monolayers from Organohydridochlorosilanes Grafted onto Oxidized (1,0,0) Silicon Wafers

Abstract

Silylation reactions of oxidized silicon(1,0,0) wafers with octadecylchlorosilanes were performed to determine the influence of the number of hydrolyzable functions on the quality of the film deposited on the surface. Octadecylchlorosilane (C18H37SiH2Cl) and octadecyldichlorosilane (C18H37SiHCl2) were synthesized and compared to the well-studied octadecyltrichlorosilane (C18H37SiCl3). The grafting reactions in CCl4 solutions were monitored by in situ internal reflection FTIR spectroscopy. The surfaces were also analyzed by wettability, ellipsometry, and atomic force microscopy (topography and friction). As expected, the Si-H bonds are unreactive under these reaction conditions, indicating that the monochlorosilane and the dichlorosilane behave as mono-and difunctional species, respectively. The surfaces obtained after grafting of octadecyltrichlorosilane and octadecyldichlorosilanesthat is, in cases where cross-linking is possiblesare similar with a very dense film of organized alkyl chains in the all-trans configuration. On the other hand, in the case of octadecylchlorosilane where no cross-linking is possible, a less organized film of monografted species is obtained.

Single and Binary Self-Assembled Monolayers of Phenyl- and Pentafluorophenyl-Based Silane Species, and Their Phase Separation with Octadecyltrichlorosilane

“…In a second part, we analyzed how phenylakyltrichlorosilane, perfluorophenylalkyltrichlorosilane, and their mixture phase separate with a third kind of molecule such as an alkyl chain. For the latter, n -octadecyltrichlorosilane molecules were chosen because they are known to form well-ordered and densely packed SAMs on silicon dioxide. − The kinetics of growth and the structure, composition, and morphology of SAMs were studied for the various molecules and their mixture with different ratios in solution. At last, the possibility of obtaining aromatic nanoislands was studied from the phase separation between phenyltriethoxysilane and n -octadecyltrichlorosilane molecules.…”

Frictional Responses of Octadecyltrichlorosilane (OTS) and 1H, 1H, 2H, 2H-Perfluorooctyltrichlorosilane (FOTS) Monolayers Self-assembled on Aluminium over Six Orders of Contact Length Scale

“…It is argued [10,15] that this encourages additional channels of energy dissipation through the excitation of molecular motion. A number of structural parameters such as size of atoms (fluorine is bigger then hydrogen), chain length [10], lateral polymerizability [16], the crystalline phase [2] and the lattice parameters of the substrate material [17] influence the entropy and density of the molecular assembly. External variables such as temperature [18] and pressure [19,20,13] influence adhesion and friction similarly, this ability being itself a function of the apriori structure [21].…”

A novel synthetic approach to poly(hydrosiloxane)s via hydrolytic oxidation of primary organosilanes with a AuNPs-stabilized Pickering interfacial catalyst

“…S10 †) which are attributed to RHSiO and H 2 RSiO units respectively by comparison with those reported earlier for [RHSiO] n and H 2 RSiOSiRH 2 (R ¼ octadecyl). 20 The IR absorptions due to Si-H, Si-O and aliphatic groups appear at 2140-2160, 1050-1070 and 2900-3000 cm À1 respectively. The efficiency of the Pickering catalyst aer the rst cycle of the reaction decreases as evident from a longer reaction time (18-24 h) for complete hydrolytic oxidation of organosilanes.…”

“…The block copolymer, PiBA 20 -b-PDMS 75 -b-PiBA 20 (1) used for surface functionalization of AuNPs was synthesized by following atom transfer radical polymerization (ATRP) 12 of isobornylacrylate (iBA) monomer using difunctional macroinitiator, (2-bromoisobutyrate terminal-PDMS), copper bromide (CuBr) and N,N,N 0 ,N 00 ,N 00 -pentamethyldiethylenetriamine (PMDETA) as complexing ligand (Scheme 1). The onset of polymerization was indicated by increase in viscosity of the solution.…”