A Nonenzymatic Glucose Sensor Using Nanoporous Platinum Electrodes Prepared by Electrochemical Alloying/Dealloying in a Water-Insensitive Zinc Chloride-1-Ethyl-3-Methylimidazolium Chloride Ionic Liquid

✍ Scribed by Chih-Hung Chou; Jyh-Cheng Chen; Chia-Cheng Tai; I-Wen Sun; Jyh-Myng Zen

• Book ID: 102183135
• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 288 KB
• Volume: 20
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/elan.200704102

✦ Synopsis

Abstract

We report here a nonenzymatic sensor by using a nanoporous platinum electrode to detect glucose directly. The electrode was fabricated by electrochemical deposition and dissolution of PtZn alloy in zinc chloride‐1‐ethyl‐3‐methylimidazolium chloride (ZnCl~2~‐EMIC) ionic liquid. Both SEM and electrochemical studies showed the evidences for the nanoporous characteristics of the as‐prepared Pt electrodes. Amperometric measurements allow observation of the electrochemical oxidation of glucose at 0.4 V (vs. Ag/AgCl) in pH 7.4 phosphate buffer solution. The sensor also demonstrates significant reproducibility in glucose detection; the higher the roughness factor of the Pt electrode, the lower the detection limit of glucose. The interfering species such as ascorbic acid and p‐acetamidophenol can be avoided by using a Pt electrode with a high roughness factor of 151. Overall, the nanoporous Pt electrode is promising for enzymeless detection of glucose at physiological condition.