Ultrasensitive detection of CrO4(2-) using a microcantilever sensor

Analytical Chemistry
H F JiP V Bonnesen

Abstract

Microcantilevers modified with a self-assembled monolayer respond sensitively to specific ion concentrations. Here, we report the detection of trace amounts of CrO4(2-) 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 CrO4(2-) ions on the monolayer-modified side. It was found that a concentration of 10(-9) M CrO4(2-) can be detected using this technology in a flow cell. Other anions, such as Cl-, Br-, CO3(2-) (or HCO3-), and SO4(2-), have minimal effect on the deflection of this cantilever. The mechanics of the bending and the chemistry of cantilever modification are discussed.

References

Mar 1, 1997·Analytical Chemistry·I Turyan, D Mandler

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Citations

Apr 20, 2004·Biosensors & Bioelectronics·Yifei ZhangMarvin Schulte
Jun 30, 2009·The Analyst·Mohammed Zougagh, Angel Ríos
Nov 3, 2011·The Analyst·Koutilya BuchapudiMarvin Schulte
Nov 1, 2006·Measurement Science & Technology·Sreepriya Velanki, Hai-Feng Ji
Oct 12, 2016·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Rong-Peng PengChen-Ho Tung
Dec 25, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Hongyan GaoHai-Feng Ji
Apr 30, 2010·Analytical Chemistry·Zhou LongMichael J Sepaniak
Jan 31, 2008·Chemical Reviews·Karen M GoedersLawrence A Bottomley
Oct 1, 2005·Analytical Chemistry·Xiaodong YanHai-Feng Ji

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