Modification of silicon oxide surfaces by monolayers of an oligoethylene glycol-terminated perfluoroalkyl silane

作者：Meiners Frank; Ross Jan Henning; Brand Izabella; Buling Anna; Neumann Manfred; Koester Philipp Julian; Christoffers Jens; Wittstock Gunther^*

来源：Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2014, 449: 31-41.

DOI：10.1016/j.colsurfa.2014.02.015

• Self-assembled monolayer
• Silicon oxide surface
• Oligoethylene glycol
• Perfluorinated silane
• Hybrid molecule
• Scanning force microscopy

Monolayers of a new hybrid compound having two linearly coupled subunits with different functionalities were prepared on the silicon oxide and silicate-like surfaces using trichlorosilane as an anchoring group. The two subunits of the hybrid compound are a perfluorinated alkyl chain and an oligoethylene glycol chain. The synthesis of the new precursor compound, 0-methyl hexaethylene glycol-icosafluorododecandiol-trichlorosilane is reported starting from commercially available triethylene glycol and perfluorododecan-1,12-diol as building blocks. The final and intermediate products were characterized by nuclear magnetic resonance (H-1 NMR, C-13 NMR, F-19 NMR and Si-29 NMR), infrared spectroscopy (IR) and high resolution mass spectrometry with chemical ionization [HRMS (Cl)]. The new compound was self-assembled on borosilicate glass, surface-oxidized silicon and silicon oxide surfaces. Properties of the self-assembled films as a function of the adsorption time were studied using contact angle measurements, X-ray photoelectron spectroscopy, polarization modulation infrared reflection absorption spectroscopy and scanning force microscopy. The adsorption of the hybrid silane on an atomically flat silica surface lead to the formation of poorly defined multilayer films. By contrast, the adsorption of the silane onto a less-ordered substrate resulted in the formation of a well-packed monolayer.

• 出版日期2014-5-1