Thermally induced alkylation of diamond

Marco Hoeb, Marianne Auernhammer, Sebastian J. Schoell, Martin S. Brandt, Jose A. Garrido, Martin Stutzmann, Ian D. Sharp

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We present an approach for the thermally activated formation of alkene-derived self-assembled monolayers on oxygen-terminated single and polycrystalline diamond surfaces. Chemical modification of the oxygen and hydrogen plasma-treated samples was achieved by heating in 1-octadecene. The resulting layers were characterized using X-ray photoelectron spectroscopy, thermal desorption spectroscopy, atomic force microscopy, Fourier transform infrared spectroscopy, and water contact angle measurements. This investigation reveals that alkenes selectively attach to the oxygen-terminated sites via covalent C-O-C bonds. The hydrophilic oxygen-terminated diamond is rendered strongly hydrophobic following this reaction. The nature of the process limits the organic layer growth to a single monolayer, and FTIR measurements reveal that such monolayers are dense and well ordered. In contrast, hydrogen-terminated diamond sites remain unaffected by this process. This method is thus complementary to the UV-initiated reaction of alkenes with diamond, which exhibits the opposite reactivity contrast. Thermal alkylation increases the range of available diamond functionalization strategies and provides a means of straightforwardly forming single organic layers in order to engineer the surface properties of diamond.

Original languageEnglish
Pages (from-to)18862-18867
Number of pages6
JournalLangmuir
Volume26
Issue number24
DOIs
StatePublished - 21 Dec 2010

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