Alkanethiols on platinum: multicomponent self-assembled monolayers

Langmuir : the ACS Journal of Surfaces and Colloids
Dmitri Y PetrovykhLloyd J Whitman

Abstract

We have studied the formation of self-assembled monolayers (SAMs) of n-alkanethiols on platinum thin films using X-ray photoelectron spectroscopy (XPS), reflection-absorption infrared spectroscopy (RAIRS), spectroscopic ellipsometry (SE), and contact angle (CA) measurements. Specifically, SAMs of 1-hexanethiol, 1-dodecanethiol, and 1-octadecanethiol were grown on polycrystalline Pt films, and the effects of Pt surface preparation, deposition conditions, and solvent treatments on the initial quality and stability of the monolayer in air were investigated. The SAMs prepared under ambient conditions on piranha-cleaned and UV/ozone-cleaned substrates were compared to monolayers formed on template-stripped Pt in an inert atmosphere. We found that alkanethiols deposited from 1 mM ethanolic solutions on piranha-cleaned Pt formed densely packed monolayers in which alkyl chains were oriented close to the surface normal. Stored in the laboratory ambient, these monolayers were unchanged over about 1 week but were largely oxidized in about 1 month. No evidence was found of molecules being weakly bound within the monolayer or having undergone C-S bond scission; however, three distinct sulfur states were observed for all samples in the XPS o...Continue Reading

References

Sep 19, 2002·Journal of the American Chemical Society·Jeremy M BeebeC Daniel Frisbie
Mar 4, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Dmitri Y PetrovykhLloyd J Whitman

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Citations

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