Photochemical hydrosilylation of 11-undecenyltriethylammonium bromide with hydrogen-terminated Si surfaces for the development of robust microcantilever sensors for Cr(VI)

V. I. Boiadjiev, G. M. Brown, L. A. Pinnaduwage, G. Goretzki, P. V. Bonnesen, T. Thundat

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22 Scopus citations

Abstract

We report a novel approach to the design and development of microcantilever sensors in which photochemical hydrosilylation is used to modify the microcantilever surface. This process enables individual microcantilevers in multicantilever array chips to be modified separately by focusing the activating UV light sequentially on each particular cantilever. Photochemical hydrosilylation of 11-undecenyltriethyl-ammonium bromide with hydrogen-terminated silicon microcantilever surfaces was carried out to yield a robust quaternary ammonium terminated organic monolayer suitable for chromate detection. The surface functionalities retain their affinity toward Cr(VI), and the organic monolayer is dense enough to generate significant surface stress upon subsequent adsorption of chromate ions from aqueous solutions.

Original languageEnglish
Pages (from-to)1139-1142
Number of pages4
JournalLangmuir
Volume21
Issue number4
DOIs
StatePublished - Feb 15 2005

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