Ion-selective sensing in micromachined electrochemical cells with nanoliter-range volume

ANYL 118

Jeffrey S. Lenihan1, J. Christopher Ball2, Vasilis G. Gavalas1, Janet K. Lumpp3, John Hines4, Sylvia Daunert, daunert@uky.edu1, and Leonidas G. Bachas, bachas@uky.edu1. (1) Department of Chemistry, University of Kentucky, Lexington, KY 40506-0055, (2) American University, (3) Department of Electrical Engineering, University of Kentucky, Lexington, KY 40506, (4) NASA Ames Research Center
Motivated by such factors as the need to analyze samples of limited availability and a desire to minimize reagent consumption and waste production, recent years have seen a surge of interest in research into the analysis of small-volume samples and, as a result, the miniaturization of (bio)analytical tools and techniques. Vials with volumes in the nanoliter range or lower have therefore been fabricated using a number of techniques for use in small-volume analysis. This work describes the development of an ion-selective sensing system for nitrate in a nanoliter-scale electrochemical cell. The techniques of screen printing and laser ablation are utilized to fabricate electrochemical cells with embedded carbon working electrodes and Ag/AgCl reference/counter electrodes. Electropolymerization of nitrate-doped polypyrrole is used to modify the working electrode, resulting in a nitrate-responsive surface. The analytical characteristics of this sensing system will be presented
 

General Papers
7:00 PM-9:00 PM, Sunday, 10 September 2006 Moscone Center -- Hall D, Poster

Division of Analytical Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006