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Sensitive Electrochemical Detection of Oxalate at a Positively Charged Boron‐Doped Diamond Surface |
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| Authors: | Takeshi Kondo Yu Niwano Akira Tamura Tribidasari A. Ivandini Yasuaki Einaga Donald A. Tryk Akira Fujishima Takeshi Kawai |
| Affiliation: | 1. Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science, 1‐3 Kagurazaka, Shinjuku‐ku, Tokyo, 162‐8601 Japan;2. Department of Chemistry, Faculty of Science and Technology, Keio University, 3‐14‐1 Hiyoshi, Yokohama, 223‐8522 Japan;3. Department of Applied Chemistry, Faculty of Urban Environmental Sciences, Tokyo Metropolitan University, Tokyo 192‐0397, Japan;4. Kanagawa Academy of Science and Technology (KAST), 3‐2‐1 Sakado, Takatsu‐ku, Kawasaki, Kanagawa, 213‐0012 Japan |
| Abstract: | Allyltriethylammonium bromide (ATAB) was covalently attached to the surface of hydrogen‐terminated boron‐doped diamond (BDD) thin films using a photochemical method to fabricate positively charged electrode surfaces. The anodic current for oxalate oxidation both in cyclic voltammetry and in flow‐injection analysis with amperometry was found to be up to two times larger at ATAB‐modified BDD (ATAB‐BDD) than at an unmodified BDD electrode, which may be based on the electrostatic interaction between the oxalate anion and the electrode surface. In addition, the stability of the electrochemical detection of oxalate was improved at the ATAB‐BDD electrode compared to the unmodified electrode. |
| Keywords: | Boron‐doped diamond electrode Oxalate Surface modification Allyltriethylammonium bromide Electrochemical detection |