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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Satoh, W. Suzuki, H. |
| Copyright Year | 2004 |
| Description | Author affiliation: Graduate Sch. of Pure & Appl. Sci., Tsukuba Univ., Ibaraki, Japan (Satoh, W.; Suzuki, H.) |
| Abstract | An integrated micro analysis system was fabricated using a microfluidic transport system driven by electrowetting and an air-gap ammonia gas-sensing electrode. The basic element in the microfluidic system was an elongated gold working electrode and a protruding polydimethylsiloxane (PDMS) structure. The wettability of the gold electrode was changed by applying a negative potential with respect to an Ag/AgCl electrode, and a solution introduced from an inlet was mobilized through the gap between the working electrode and the protruding structure. Also, with a row of working electrodes with a narrow gap between them, the solution could be transported to any desired directions without using any valves. The principle was also used to realize a mixing mechanism. The simple structure and the principle of operation facilitated a higher level of integration. The open structure of the flow channel was advantageously used to form an air gap between a sample solution and the electrolyte solution for the ammonia electrode. Distinct changes in the indicator electrode potential were observed with 90% response time of 45 s (at 10 mM). A linear relationship was observed between the indicator potential and the logarithm of the concentration of ammonia. The lower detection limit was 50 /spl mu/M. |
| Starting Page | 1577 |
| Ending Page | 1580 |
| File Size | 527097 |
| Page Count | 4 |
| File Format | |
| ISBN | 0780386922 |
| DOI | 10.1109/ICSENS.2004.1426492 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2004-10-24 |
| Publisher Place | Austria |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Microfluidics Electrodes Air gaps Fabrication Gold Glass System-on-a-chip Sputtering Fluidic microsystems Valves |
| Content Type | Text |
| Resource Type | Article |
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