Solid-State Reference Electrode Based on Electrodeposited Nanoporous Platinum for Microchip

✍ Scribed by Ji-Hyung Han; Sejin Park; Hankil Boo; Hee Chan Kim; Jongmin Nho; Taek Dong Chung

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 440 KB
• Volume: 19
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/elan.200603772

✦ Synopsis

Abstract

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)$\rm{ _6^{3 - /4 - } }$, 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.