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.
| Verfasserangaben: | 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 |
| Titel des übergeordneten Werkes (Englisch): | Sensor and Actuators B: Chemical |
| Verlag: | Elsevier |
| Verlagsort: | Amsterdam |
| Dokumentart: | Wissenschaftlicher Artikel |
| Sprache: | Englisch |
| Erscheinungsjahr: | 2017 |
| Datum der Erstveröffentlichung: | 21.08.2017 |
| Datum der Publikation (Server): | 21.08.2017 |
| Freies Schlagwort / Tag: | Chemical sensor; EIS capacitive sensor; Negative impedance convertor; Resonance-mode measurement |
| Jahrgang: | 248 |
| Erste Seite: | 1006 |
| Letzte Seite: | 1010 |
| Link: | https://doi.org/10.1016/j.snb.2017.03.002 |
| Zugriffsart: | campus |
| Fachbereiche und Einrichtungen: | FH Aachen / Fachbereich Medizintechnik und Technomathematik |
| FH Aachen / INB - Institut für Nano- und Biotechnologien | |
| collections: | Verlag / Elsevier |
