Development of High-Sensitive Detection System for Redox Analytes Having a Standard Potential Higher Than O 2 Evolution by Using Micropatterned Conductive Boron-Doped DLC Electrodes

• Main Authors: Ohtomo, Shinpei, Naragino, Hiroshi, Okafuji, Keigo, Kobayashi, Ryutaro, Honda, Kensuke
• Format: Conference Proceeding
• Language: English
• ISSN: 1938-5862; 1938-6737
• DOI: 10.1149/07516.0217ecst

High sensitive electroanalytical system for redox analytes with standard potential higher than O 2 evolution was developed by realizing interdigitated microarray electrodes based on boron-doped DLC (B-DLC-IDA). For Ce 3+/4+ with the standard potential of 1.6 V, the amplification of response current derived from redox cycling was observed at B-DLC-IDA in the dual mode measurement. The amperometric current was amplified 180-fold by applying the potential of 1.7 V and 0.8 V to the collector and the generator electrodes in chronoamperometriy (CA) at the dual mode measurement. Theoretical detection limit (S/N = 3) toward Ce 3+ was 0.13 μM. This detection limit was able to be improved to the value 2 orders of magnitude lower than that at B-DLC flat electrode by developing the electroanalytical system using B-DLC-IDA electrodes.