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 |
|---|---|
| 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 |
