Reference-Electrode Free pH Sensing Using Impedance Spectroscopy
| Autor: | Jan C.T. Eijkel, Mathieu Odijk, Karin G.F. Gerritsen, Lennart Gehrenkemper, Laura Folkertsma |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Double layer (biology)
impedance spectroscopy Materials science human plasma business.industry Double-layer capacitance lcsh:A Conductivity Reference electrode indium tin oxide Indium tin oxide Dielectric spectroscopy double layer capacitance Electrode Miniaturization Optoelectronics pH sensor conductivity lcsh:General Works business |
| Zdroj: | Proceedings, Vol 2, Iss 13, p 742 (2018) Eurosensors 2019: Proceedings MDPI, 2(13) Proceedings, 2(13) |
| ISSN: | 2504-3900 |
| Popis: | We present a reference-electrode free sensor able to measure both pH and conductivitybased on impedance spectroscopy. The electrode is made of a layer of indium-tin-oxide (ITO). Theimpedance of this electrode at low frequencies depends on its double layer capacity, which varieswith pH due to modification of oxide groups at the ITO surface. At high frequencies, the impedanceis determined by the resistance in the system, which corresponds to the inverse conductivity of thesolution. Because no reference electrode is needed for this technique, miniaturization of the pHsensor is simple. We demonstrate a proof-of-principle experiment of the sensor for human plasmapH measurements. |
| Databáze: | OpenAIRE |
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