This study demonstrates the ability of time-of-flight (ToF) SIMS to discriminate and detect chemical reaction products formed between model lubricant molecules and metal surfaces. Ethyl laurate was shown to eliminate the ethyl group, leaving the laurate anion. On Al–Mg alloy surfaces, a direct interaction with the amine and aluminium oxide surface is observed by the detection of a molecular ion that corresponds to the mass of dodecylamine and AlO −, characteristic of aluminium oxide. The formation of carboxylate reaction products was confirmed by Fourier transform infrared spectroscopy. In addition, negative secondary ion mass spectra indicate that a surface carboxylate is formed from the alcohol. For example, films composed of the fatty alcohol dodecanol were observed to emit monomers, dimers and trimers with discrete distributions. This work demonstrates that organic molecules with alcohol, ester and amine functional groups undergo specific chemical reactions with oxidized Al–Mg alloy surfaces.
This static SIMS study of organic thin films has been able to identify specific reaction products on the aluminium surface for each functional group. The aim of this study is to develop an understanding of the interactions of model lubricants with metal surfaces, such as gold and aluminium.
Static secondary ion mass spectrometry was used to study the chemical reactions and lateral distributions of fatty amines, alcohols and esters spin coated onto gold surfaces and commercial aluminium–magnesium (Al–Mg) alloy surfaces, cleaned using UV–ozone.
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