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Title of article :
Microfabricated electrochemical sensors for exhaustive coulometry applications
Author/Authors :
Carroll، نويسنده , , S. and Marei، نويسنده , , M.M. and Roussel، نويسنده , , T.J. and Keynton، نويسنده , , R.S. and Baldwin، نويسنده , , R.P.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
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Abstract :
The development of microfabricated electrochemical systems suitable for deployment in sensor networks that operate with a minimum of operator intervention are of great interest; therefore, a coulometric sensing system for exhaustive coulometry with the potential for calibration-free operation has been designed, fabricated and evaluated to support such development. The sensor chips were microfabricated onto a silicon substrate and contained a variety of specially designed thin-film gold working electrodes (ranging from one to five per chip) and a Ag/AgCl pseudo-reference electrode. A custom flow cell containing fluidic connections and counter electrode chamber was also constructed to integrate the sensor and to create an electrolysis chamber with a fixed volume. Different chip designs were evaluated as exhaustive coulometric sensors in terms of reproducibility and longevity using Fe(CN)63−/4− as model analytes. The relative standard deviation (RSD) for a chip tested over a period of 42 days was 5.5% whereas the sensor-to-sensor reproducibility was within 6.3%.
Keywords :
Exhaustive coulometry , Thin-layer cell , Microfabrication , Electrode array
Journal title :
Sensors and Actuators B: Chemical
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Link To Document :