Directly amplified redox sensor for on-chip chemical analysis

In recent years, many groups have studied redox sensors for chemical analysis. A redox sensor has certain powerful advantages, such as its ability to detect multiple ions inside the sensing area, and its ability to measure concentrations of materials by using voltage and current signals. However, th...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2014-03, Vol.53 (3), p.36702-1-036702-5
Main Authors: Takahashi, Sou, Futagawa, Masato, Ishida, Makoto, Sawada, Kazuaki
Format: Article
Language:English
Subjects:
Amplification
Bipolar transistors
Chemical analysis
Chemical sensors
Detection
Potassium ferricyanide
Semiconductor devices
Sensors
Voltage
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Summary:In recent years, many groups have studied redox sensors for chemical analysis. A redox sensor has certain powerful advantages, such as its ability to detect multiple ions inside the sensing area, and its ability to measure concentrations of materials by using voltage and current signals. However, the output current signal of a redox sensor decreases when either concentration or sensing area decreases. Therefore, we propose the use of an amplified redox sensor (ARS) for measuring small current signals. The proposed sensor consists of a working electrode combined with a bipolar transistor. In this study, we fabricated an ARS sensor and performed low-concentration measurements using current signal amplification with an integrated bipolar transistor. The sensor chip successfully detected a potassium ferricyanide (K3[Fe(CN)6]) concentration of as low as 10 µM using cyclic voltammetry.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.53.036702