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Sensors
Volume 22
Issue 5
10.3390/s22051807
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Communication

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

by
Shuto Kawaguchi
1,*,
Reona Nomoto
1,
Hirotaka Sato
1,
Teruaki Takarada
1,
Yu Hao Chang
1 and
Hiroshi Kawarada
1,2,*
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)
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Abstract

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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