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A high-Q resonance-mode measurement of EIS capacitive sensor by elimination of series resistance
- An EIS capacitive sensor is a semiconductor-based potentiometric sensor, which is sensitive to the ion concentration or pH value of the solution in contact with the sensing surface. To detect a small change in the ion concentration or pH, a small capacitance change must be detected. Recently, a resonance-mode measurement was proposed, in which an inductor was connected to the EIS capacitive sensor and the resonant frequency was correlated with the pH value. In this study, the Q factor of the resonant circuit was enhanced by canceling the internal resistance of the reference electrode and the internal resistance of the inductor coil with the help of a bypass capacitor and a negative impedance converter, respectively. 1% variation of the signal in the developed system corresponded to a pH change of 3.93 mpH, which was about 1/12 of the conventional method, suggesting a better performance in detection of a small pH change.
Author: | Ko-ichiro Miyamoto, Kosuke Hayashi, Azuma Sakamoto, Frederik WernerORCiD, Torsten WagnerORCiD, Michael Josef SchöningORCiD, Tatsuo Yoshinobu |
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DOI: | https://doi.org/10.1016/j.snb.2017.03.002 |
ISSN: | 0925-4005 |
Parent Title (English): | Sensor and Actuators B: Chemical |
Publisher: | Elsevier |
Place of publication: | Amsterdam |
Document Type: | Article |
Language: | English |
Year of Completion: | 2017 |
Date of first Publication: | 2017/08/21 |
Date of the Publication (Server): | 2017/08/21 |
Tag: | Chemical sensor; EIS capacitive sensor; Negative impedance convertor; Resonance-mode measurement |
Volume: | 248 |
First Page: | 1006 |
Last Page: | 1010 |
Link: | https://doi.org/10.1016/j.snb.2017.03.002 |
Zugriffsart: | campus |
Institutes: | FH Aachen / Fachbereich Medizintechnik und Technomathematik |
FH Aachen / INB - Institut für Nano- und Biotechnologien | |
collections: | Verlag / Elsevier |