Role of Carboxyl and Amine Termination on a Boron-Doped Diamond Solution Gate Field Effect Transistor (SGFET) for pH Sensing
In this paper, we report on the effect of carboxyl- and amine terminations on a boron-doped diamond surface (BDD) in relation to pH sensitivity. Carboxyl termination was achieved by anodization oxidation in Carmody buffer solution (pH 7). The carboxyl-terminated diamond surface was exposed to nitrog...
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MDPI AG
2018-07-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/18/7/2178 |
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| author | Shaili Falina Sora Kawai Nobutaka Oi Hayate Yamano Taisuke Kageura Evi Suaebah Masafumi Inaba Yukihiro Shintani Mohd Syamsul Hiroshi Kawarada |
| author_facet | Shaili Falina Sora Kawai Nobutaka Oi Hayate Yamano Taisuke Kageura Evi Suaebah Masafumi Inaba Yukihiro Shintani Mohd Syamsul Hiroshi Kawarada |
| author_sort | Shaili Falina |
| collection | DOAJ |
| description | In this paper, we report on the effect of carboxyl- and amine terminations on a boron-doped diamond surface (BDD) in relation to pH sensitivity. Carboxyl termination was achieved by anodization oxidation in Carmody buffer solution (pH 7). The carboxyl-terminated diamond surface was exposed to nitrogen radicals to generate an amine-terminated surface. The pH sensitivity of the carboxyl- and amine-terminated surfaces was measured from pH 2 to pH 12. The pH sensitivities of the carboxyl-terminated surface at low and high pH are 45 and 3 mV/pH, respectively. The pH sensitivity after amine termination is significantly higher—the pH sensitivities at low and high pH are 65 and 24 mV/pH, respectively. We find that the negatively-charged surface properties of the carboxyl-terminated surface due to ionization of –COOH causes very low pH detection in the high pH region (pH 7–12). In the case of the amine-terminated surface, the surface properties are interchangeable in both acidic and basic solutions; therefore, we observed pH detection at both low and high pH regions. The results presented here may provide molecular-level understanding of surface properties with charged ions in pH solutions. The understanding of these surface terminations on BDD substrate may be useful to design diamond-based biosensors. |
| first_indexed | 2024-04-13T07:25:04Z |
| format | Article |
| id | doaj.art-b9c0f467def8494e9a7afdd60693b1de |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-13T07:25:04Z |
| publishDate | 2018-07-01 |
| publisher | MDPI AG |
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| series | Sensors |
| spelling | doaj.art-b9c0f467def8494e9a7afdd60693b1de2022-12-22T02:56:30ZengMDPI AGSensors1424-82202018-07-01187217810.3390/s18072178s18072178Role of Carboxyl and Amine Termination on a Boron-Doped Diamond Solution Gate Field Effect Transistor (SGFET) for pH SensingShaili Falina0Sora Kawai1Nobutaka Oi2Hayate Yamano3Taisuke Kageura4Evi Suaebah5Masafumi Inaba6Yukihiro Shintani7Mohd Syamsul8Hiroshi Kawarada9Faculty of Science and Engineering, Waseda University, Tokyo 169-8555, JapanFaculty of Science and Engineering, Waseda University, Tokyo 169-8555, JapanFaculty of Science and Engineering, Waseda University, Tokyo 169-8555, JapanFaculty of Science and Engineering, Waseda University, Tokyo 169-8555, JapanFaculty of Science and Engineering, Waseda University, Tokyo 169-8555, JapanFaculty of Science and Engineering, Waseda University, Tokyo 169-8555, JapanFaculty of Science and Engineering, Waseda University, Tokyo 169-8555, JapanFaculty of Science and Engineering, Waseda University, Tokyo 169-8555, JapanFaculty of Science and Engineering, Waseda University, Tokyo 169-8555, JapanFaculty of Science and Engineering, Waseda University, Tokyo 169-8555, JapanIn this paper, we report on the effect of carboxyl- and amine terminations on a boron-doped diamond surface (BDD) in relation to pH sensitivity. Carboxyl termination was achieved by anodization oxidation in Carmody buffer solution (pH 7). The carboxyl-terminated diamond surface was exposed to nitrogen radicals to generate an amine-terminated surface. The pH sensitivity of the carboxyl- and amine-terminated surfaces was measured from pH 2 to pH 12. The pH sensitivities of the carboxyl-terminated surface at low and high pH are 45 and 3 mV/pH, respectively. The pH sensitivity after amine termination is significantly higher—the pH sensitivities at low and high pH are 65 and 24 mV/pH, respectively. We find that the negatively-charged surface properties of the carboxyl-terminated surface due to ionization of –COOH causes very low pH detection in the high pH region (pH 7–12). In the case of the amine-terminated surface, the surface properties are interchangeable in both acidic and basic solutions; therefore, we observed pH detection at both low and high pH regions. The results presented here may provide molecular-level understanding of surface properties with charged ions in pH solutions. The understanding of these surface terminations on BDD substrate may be useful to design diamond-based biosensors.http://www.mdpi.com/1424-8220/18/7/2178boron-doped diamondcarboxyl terminationamine terminationpH sensitivitypolycrystalline diamondelectrolyte-solution-gate field-effect-transistor |
| spellingShingle | Shaili Falina Sora Kawai Nobutaka Oi Hayate Yamano Taisuke Kageura Evi Suaebah Masafumi Inaba Yukihiro Shintani Mohd Syamsul Hiroshi Kawarada Role of Carboxyl and Amine Termination on a Boron-Doped Diamond Solution Gate Field Effect Transistor (SGFET) for pH Sensing Sensors boron-doped diamond carboxyl termination amine termination pH sensitivity polycrystalline diamond electrolyte-solution-gate field-effect-transistor |
| title | Role of Carboxyl and Amine Termination on a Boron-Doped Diamond Solution Gate Field Effect Transistor (SGFET) for pH Sensing |
| title_full | Role of Carboxyl and Amine Termination on a Boron-Doped Diamond Solution Gate Field Effect Transistor (SGFET) for pH Sensing |
| title_fullStr | Role of Carboxyl and Amine Termination on a Boron-Doped Diamond Solution Gate Field Effect Transistor (SGFET) for pH Sensing |
| title_full_unstemmed | Role of Carboxyl and Amine Termination on a Boron-Doped Diamond Solution Gate Field Effect Transistor (SGFET) for pH Sensing |
| title_short | Role of Carboxyl and Amine Termination on a Boron-Doped Diamond Solution Gate Field Effect Transistor (SGFET) for pH Sensing |
| title_sort | role of carboxyl and amine termination on a boron doped diamond solution gate field effect transistor sgfet for ph sensing |
| topic | boron-doped diamond carboxyl termination amine termination pH sensitivity polycrystalline diamond electrolyte-solution-gate field-effect-transistor |
| url | http://www.mdpi.com/1424-8220/18/7/2178 |
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