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Microelectrochemical Systems on Silicon Chips for the Detection of Pollutants in Seawater

✍ Scribed by Waleed Moujahid; Patrycja Eichelmann-Daly; Jörg Strutwolf; Vladimir I. Ogurtsov; Grégoire Herzog; Damien W. M. Arrigan

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
393 KB
Volume
23
Category
Article
ISSN
1040-0397

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✦ Synopsis

The ever-growing demand for simple, fast and reliable techniques for the detection of pollutants and contaminants in the environment has sparked the development of remote detection and monitoring systems which include application specific sensors, instrumentation and signal processing. We report here the design, fabrication and characterisation of four designs of microelectrochemical systems on silicon chip for the detection of pollutants in artificial seawater. These systems were fabricated by photolithography and incorporate a Pt working microelectrode array (squares or bands), a Pt counter electrode and a Ag j AgCl reference electrode. They have been characterised by cyclic voltammetry of ferricyanide and behaved in good agreement with the theory. These systems were evaluated over 72 hours and showed good stability. Underpotential Deposition -Stripping Voltammetry experiments of Cu 2 + in artificial seawater have been carried out at an array of 35 microsquares of 20 mm 20 mm. The sensitivity achieved was (2.93 AE 0.14) mA cm À2 mM À1 , with 1 mM being the lowest Cu 2 + concentration measured. These devices provide the basis for the development into sensor systems for remote analysis applications.

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