Journal
ELECTROANALYSIS
Volume 19, Issue 7-8, Pages 786-792Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.200603772
Keywords
solid-state; reference electrode; nanoporous; platinum; microchip
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A new solid-state reference electrode operating in buffered aqueous solution for electrochemical system on microfluidic chip is reported. The anodized nanoporous platinum showed its usefulness as a solid-state reference electrode owing to near-Nernstian behavior, low hysteresis, and quick response. The presence of redox couples such as Fe(CN)(6)(3-/4-), bringing about significant interference, can be successfully suppressed by an electropolymerized poly-1,3-phenylendiamine (poly-m-PD) layer on the nanoporous platinum surface. Since the poly-m-PD coated nanoporous platinum oxide responds exclusively to pH, its potential should be constant and stable in a buffer solution. The nanoporous platinum oxide with poly-m-PD film is easy to produce and is particularly compatible with microfabrication. The experimental results in this study demonstrate that the proposed system successfully works as a solid-state reference electrode that should be integrated on microchips for microanalysis systems.
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