Journal
ACS SENSORS
Volume 6, Issue 10, Pages 3650-3656Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.1c01273
Keywords
pH sensor; capacitor; diode; self-powered sensor; ions; memory
Funding
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [712949]
- Agency for Business Competitiveness of the Government of Catalonia
- Swiss National Science Foundation
Ask authors/readers for more resources
The article introduces an advanced self-powered potentiometric sensor with memory, capable of recording real-time ion activity and determining if 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, allowing minimal electronic components in a self-powered design.
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available