Journal
ANALYTICA CHIMICA ACTA
Volume 556, Issue 1, Pages 164-170Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2005.05.028
Keywords
ion-selective optode; ion sensor; microchip; polydimethylsiloxane; square capillary
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Multiple-ion-sensing functions are integrated on a capillary-assembled microchip (CAs-CHIP). Since the CAs-CHIPs are fabricated by embedding various chemically functionalized square capillaries onto a lattice PDMS channel plate having same channel dimensions as outer dimensions of square capillaries, integration of parallel multiple-ion-sensing is easily realized. Here, three ion-sensing capillaries are prepared and used for integrating these functions onto a single microchip. Ion-sensing square capillaries (sodium, potassium, calcium) are prepared by attaching ion-selective optode membranes to inner wall of capillaries, and are characterized in terms of response time, response range, and ion selectivity. Finally, fully characterized ion-sensing capillaries are embedded into PDMS channel plate in parallel to fabricate a multiple-ion-sensing chip. The CAs-CHIP-based strategy is promising for integrating multiple chemical sensing functions onto a single microchip. (c) 2004 Elsevier B.V. All rights reserved.
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