Chloride and pH Determination on a Wireless, Flexible Electrochemical Sensor Platform
| Autor: | Kristin Imenes, Erik A. Johannessen, Sindre Søpstad |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
010401 analytical chemistry Potentiometric titration Analytical chemistry 01 natural sciences Reference electrode Flexible electronics Amperometry 0104 chemical sciences Electrochemical gas sensor chemistry.chemical_compound Polyvinyl butyral chemistry Electrode Electrical and Electronic Engineering Ferrocyanide Instrumentation |
| Zdroj: | IEEE Sensors Journal. 20:599-609 |
| ISSN: | 2379-9153 1530-437X |
| DOI: | 10.1109/jsen.2019.2944407 |
| Popis: | A stamp-sized, flexible, wireless, generic electrochemical sensor platform was demonstrated for use as a potentiometric pH and amperometric Cl− sensor. The platform combines flexible printed circuit technology with screen-printed electrodes, which enables cheap and easy quantification of biorelevant analytes in many different environments. pH sensors with graphene oxide as the recognition element was constructed on a ferrocyanide modified carbon electrode, to maintain a well-defined redox potential even at high alkalinity. A solid-state reference electrode based on a NaCl-doped polyvinyl butyral membrane ensured applicability towards sample matrices of unknown composition by remining unsensitive (±7.1 mV) to external Cl− in the range pCl 0–3. The platform was able to linearly (−26.3 mV pH−1, r2 = 0.99) quantify pH in the range of 2–9 with a maximum inter-sensor standard deviation of 0.43 pH units. Secondly, a Cl− sensor combining three unmodified Ag/AgCl electrodes with squarewave amperometry was designed, simulated and tested. A sensitivity of (−147.7 $\mu \text{A}$ pCl−1, r2 = 0.97) was obtained, with a maximum inter-sensor standard deviation of 0.27 pCl units in the range pCl 0–3. |
| Databáze: | OpenAIRE |
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