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Sensors 2017, 17(5), 1040; doi:10.3390/s17051040

An All-Solid-State pH Sensor Employing Fluorine-Terminated Polycrystalline Boron-Doped Diamond as a pH-Insensitive Solution-Gate Field-Effect Transistor

1
Graduate School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
2
R&D Departent, Innovation Center, MK-Hdqrs, Yokogawa Electric Corporation, Japan, 2-9-32 Nakacho, Musashino, Tokyo 180-8750, Japan
3
The Kagami Memorial Laboratory for Materials Science and Technology, Waseda University, 2-8-26 Nishiwaseda, Shinjuku, Tokyo 169-0051, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 28 March 2017 / Revised: 28 April 2017 / Accepted: 3 May 2017 / Published: 5 May 2017
(This article belongs to the Section Chemical Sensors)
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Abstract

A fluorine-terminated polycrystalline boron-doped diamond surface is successfully employed as a pH-insensitive SGFET (solution-gate field-effect transistor) for an all-solid-state pH sensor. The fluorinated polycrystalline boron-doped diamond (BDD) channel possesses a pH-insensitivity of less than 3mV/pH compared with a pH-sensitive oxygenated channel. With differential FET (field-effect transistor) sensing, a sensitivity of 27 mv/pH was obtained in the pH range of 2–10; therefore, it demonstrated excellent performance for an all-solid-state pH sensor with a pH-sensitive oxygen-terminated polycrystalline BDD SGFET and a platinum quasi-reference electrode, respectively. View Full-Text
Keywords: fluorine-termination; pH-insensitivity; polycrystalline boron-doped diamond; electrolyte-solution-gate field-effect transistor; all-solid-state pH sensor fluorine-termination; pH-insensitivity; polycrystalline boron-doped diamond; electrolyte-solution-gate field-effect transistor; all-solid-state pH sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Shintani, Y.; Kobayashi, M.; Kawarada, H. An All-Solid-State pH Sensor Employing Fluorine-Terminated Polycrystalline Boron-Doped Diamond as a pH-Insensitive Solution-Gate Field-Effect Transistor. Sensors 2017, 17, 1040.

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