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Communication

pH Measurement at Elevated Temperature with Vessel Gate and Oxygen-Terminated Diamond Solution Gate Field Effect Transistors

1
Graduate School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
2
The Kagami Memorial Laboratory for Materials Science and Technology, Waseda University, 2-8-26 Nishiwaseda, Shinjuku, Tokyo 169-0051, Japan
*
Authors to whom correspondence should be addressed.
Academic Editor: Tae Geun Kim
Sensors 2022, 22(5), 1807; https://doi.org/10.3390/s22051807
Received: 25 January 2022 / Revised: 21 February 2022 / Accepted: 23 February 2022 / Published: 25 February 2022
(This article belongs to the Section Electronic Sensors)
Diamond has many appealing properties, including biocompatibility, ease of surface modification, and chemical–physical stability. In this study, the temperature dependence of the pH-sensitivity of a oxygen-terminated boron-doped diamond solution gate FET (C-O BDD SGFET) is reported. The C-O BDD SGFET operated in an electrolyte solution at 95 °C. At 80 °C, the pH sensitivity of C-O BDD SGFET dropped to 4.27 mV/pH. As a result, we succeeded in developing a highly sensitive pH sensing system at −54.6 mV/pH at 80 °C by combining it with a highly pH sensitive stainless-steel vessel. View Full-Text
Keywords: boron-doped diamond; pH insensitive; stainless-steel vessel; diamond solution gate field effect transistor; high temperature boron-doped diamond; pH insensitive; stainless-steel vessel; diamond solution gate field effect transistor; high temperature
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MDPI and ACS Style

Kawaguchi, S.; Nomoto, R.; Sato, H.; Takarada, T.; Chang, Y.H.; Kawarada, H. pH Measurement at Elevated Temperature with Vessel Gate and Oxygen-Terminated Diamond Solution Gate Field Effect Transistors. Sensors 2022, 22, 1807. https://doi.org/10.3390/s22051807

AMA Style

Kawaguchi S, Nomoto R, Sato H, Takarada T, Chang YH, Kawarada H. pH Measurement at Elevated Temperature with Vessel Gate and Oxygen-Terminated Diamond Solution Gate Field Effect Transistors. Sensors. 2022; 22(5):1807. https://doi.org/10.3390/s22051807

Chicago/Turabian Style

Kawaguchi, Shuto, Reona Nomoto, Hirotaka Sato, Teruaki Takarada, Yu H. Chang, and Hiroshi Kawarada. 2022. "pH Measurement at Elevated Temperature with Vessel Gate and Oxygen-Terminated Diamond Solution Gate Field Effect Transistors" Sensors 22, no. 5: 1807. https://doi.org/10.3390/s22051807

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