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.

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Metadaten
Author:Ko-ichiro Miyamoto, Kosuke Hayashi, Azuma Sakamoto, Frederik WernerORCiD, Torsten WagnerORCiD, Michael Josef SchöningORCiD, Tatsuo Yoshinobu
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
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