Self-Powered Potentiometric Sensors with Memory
| Autor: | Eric Bakker, Sunil Kumar Sailapu, Neus Sabaté |
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| Rok vydání: | 2021 |
| Předmět: |
Analyte
Materials science Potentiometric titration Bioengineering 02 engineering and technology 01 natural sciences Signal law.invention law Potentiometric sensor Instrumentation Electrodes Diode Fluid Flow and Transfer Processes business.industry Process Chemistry and Technology 010401 analytical chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Capacitor visual_art Electronic component visual_art.visual_art_medium Potentiometry Optoelectronics Electronics 0210 nano-technology business Voltage |
| Zdroj: | ACS sensors. 6(10) |
| ISSN: | 2379-3694 |
| Popis: | Potentiometric sensors induce a spontaneous voltage that indicates ion activity in real time. We present here an advanced self-powered potentiometric sensor with memory. Specifically, the approach allows for one to record a deviation from the analyte's original concentration or determine whether the analyte concentration has surpassed a threshold in a predefined time interval. The sensor achieves this by harvesting energy in a capacitor and preserving it with the help of a diode. While the analyte concentration is allowed to return to an original value following a perturbation over time, this may not influence the sensor readout. To achieve the diode function, the sensor utilizes an additional pair of driving electrodes to move the potentiometric signal to a sufficiently high base voltage that is required for operating the diode placed in series with the capacitor and between the sensing probes. A single voltage measurement across the capacitor at the end of a chosen time interval is sufficient to reveal any altered ion activity occurring during that period. We demonstrate the applicability of the sensor to identify incurred pH changes in a river water sample during an interval of 2 h. This approach is promising for achieving deployable sensors to monitor ion activity relative to a defined threshold during a time interval with minimal electronic components in a self-powered design. |
| Databáze: | OpenAIRE |
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