Ultrasensitive detection of CrO42- using a microcantilever sensor

H. F. Ji, T. Thundat, R. Dabestani, G. M. Brown, P. F. Britt, P. V. Bonnesen

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

Microcantilevers modified with a self-assembled monolayer respond sensitively to specific ion concentrations. Here, we report the detection of trace mounts of CrO42- using microcantilevers modified with a self-assembled monolayer of triethyl-12-mercaptododecylammonium bromide. The self-assembled monolayer was prepared on a silicon microcantilever coated with a thin layer of gold on one side. The microcantilever undergoes bending due to sorption of CrO42- ions on the monolayer-modified side. It was found that a concentration of 10-9 M CrO42- can be detected using this technology in a flow cell. Other anions, such as Cl-, Br-, CO32- (or HCO3-), and SO42-, have minimal effect on the deflection of this cantilever. The mechanics of the bending and the chemistry of cantilever modification are discussed.

Original languageEnglish
Pages (from-to)1572-1576
Number of pages5
JournalAnalytical Chemistry
Volume73
Issue number7
DOIs
StatePublished - Apr 1 2001

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