Intermolecular Interactions between a Monomolecular Hydroxyl-Terminated Perfluoropolyether Film and the Sputtered SiNx Surface

Autor:	George W. Tyndall, B. K. Yen, Richard Longstreth White, D. J. Pocker, Robert Waltman
Rok vydání:	2004
Předmět:	Hydrogen bond Chemistry General Chemical Engineering Intermolecular force Binding energy General Chemistry Photochemistry Surface energy Contact angle X-ray photoelectron spectroscopy Monolayer Materials Chemistry Organic chemistry Fourier transform infrared spectroscopy
Zdroj:	Chemistry of Materials. 16:4878-4889
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm040054y
Popis:	The intermolecular interactions at the interface between a monomolecular hydroxyl-terminated perfluoropolyether (PFPE) liquid and an amorphous silicon nitride (SiNx) film were investigated using contact angle goniometry, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The results demonstrate that the surface of the sputtered SiNx film is highly oxidized (SiO2) and contain hydroxyl groups (SiOH) that are capable of attractive interactions with the hydroxyl end groups of the PFPE. The attractive interactions lead to a lowering of the polar surface energy with increasing PFPE coverage up to a monolayer. Ab initio quantum chemical computations on model dimers provide the energetic details associated with the PFPE/surface interactions. The primary source of the attractive, adhesive interactions in the PFPE/SiNx system stems from hydrogen bonding between the PFPE and SiNx hydroxyl groups. The binding energy is computed to be approximately −4 kcal/mol. Both the SiNx surface nitroge...
Databáze:	OpenAIRE
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