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Formation of Self-Assembled Alkanethiol Monolayers on Pt and Ir Substrates

IP.com Disclosure Number: IPCOM000016485D
Original Publication Date: 2003-Jun-25
Included in the Prior Art Database: 2003-Jun-25
Document File: 1 page(s) / 61K

Publishing Venue

IBM

Abstract

The invention described here expands the formation and use of self-assembled monolayers (SAMs) of alkanethiols to Pt and Ir substrates. SAMs can be formed on Pt and Ir surfaces either from solution or by printing, and these films can be used to modify the surface properties of these metals.

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Formation of Self-Assembled Alkanethiol Monolayers on Pt and Ir Substrates

  SAMs are formed by the chemisorption of functionalized, long-chain organic molecules and their self-organization on the surface of appropriate substrates providing interfaces having a well-defined chemical composition, structure and thickness. There are two substrate/SAM systems, alkylsiloxanes on silicon oxide [1] and alkanethiols on Au [2], which have been extensively studied and used. The latter represents probably the best model system for SAMs, because alkanethiols spontaneously chemisorb on Au surfaces via their thiol functionality, and the alkyl chains self-assemble into a dense and ordered monolayer [2]. The molecules forming the SAM can be supplied from solution, via the gas phase, or by microcontact printing (µCP). The chemisorbed monolayer, although only 2 to 3 nm thick, can drastically alter the surface characteristics of the Au, and can serve as a resist against etchants, as template for metallization or crystal growth, or can influence its wetting and adhesion properties [3]. In addition to Au, the formation of alkanethiol monolayers has been demonstrated for Ag, Cu, and Pd, and it might be desirable to further expand the variety of substrate/SAM systems. Recent experiments showed that alkanethiol monolayers can also be formed on Pt and Ir substrates. In principle, this finding is not surprising due to the similar chemical properties that these metal share with Au, in particu...