Electrochemical Sensing Module Overview and Potentiostat Parameters

In this meeting, the Electrochemical Sensing Module based on the EmStat-pico potentiostat was discussed. The module features precise, low-power control unit Arduino MKR Zero and supports techniques such as voltammetry and EIS. Potentiostat parameters include a full dc-potential range, EIS frequency range, and various current ranges and modes. The module's voltammetric techniques encompass Linear Sweep Voltammetry, Cyclic Voltammetry, and more. Additionally, limitations of the potentiostat, including precision resistors for self-calibration, were highlighted.

• Electrochemical Sensing
• Potentiostat Parameters
• Voltammetric Techniques
• Low-Power Device
• EmStat-pico

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1. INTERREG Meeting ATCZ-86 Krems WaterMon 04.11.2021

2. Electrochemical sensing module Jakub Arm 2 04.11.2021

3. Agenda Overview of the sensing module Potentiostat parameters Potentiostat example of LSV Sensing module power consumption Future plans 3 04.11.2021

4. Overview The module is based on EmStat-pico (potentiostat) Precise, low-power device Control unit Arduino MKR Zero Programing (measurement) using scripts (tuneable) Supported techniques: voltammetry, EIS Electrodes - printed Preliminary study was promising with both the SPGE and SPCE (half yearly progress report) Communication with the control unit via UART 3,3 V (RXD, TXD, GND) defined on the last telco 4 04.11.2021

5. Potentiostat parameters Full dc-potential range: -1.7 (-1.2) V to +2 V EIS frequency range: 0.016 Hz to 200 kHz Current ranges: 100 nA to 5 mA Modes: Low Speed (up to 1 V/s or up to 100 Hz) High Speed (up to 200 kHz) Max Range (optimal dynamic dc-potential range) Source: https://www.palmsens.com/product/oem-emstat-pico-module/ 5 04.11.2021

6. Potentiostat parameters Voltammetric techniques: Linear Sweep Voltammetry Cyclic Voltammetry Square Wave Voltammetry Differential Pulse Voltammetry Normal Pulse Voltammetry Electrochemical Impedance Spectroscopy Techniques as a function of time: Chronoamperometry Pulsed Amperometric Detection Open Circuit Potentiometry MultiStep Amperometry 6 04.11.2021

7. Potentiostat parameters 7 04.11.2021

8. Potentiostat parameters 8 04.11.2021

9. Potentiostat limitations On-board 1 k and 100 k precision resistors (accuracy: 0.1%, temperature coefficient: 25 ppm/ C) for self- calibration 9 04.11.2021

10. Potentiostat LSV example The whole measurement takes approx. 10s 10 04.11.2021

11. Power consumption - theoretical EmStat Pico (Normal, High Speed, 1 channel): 30 mA @ 5 VDC EmStat Pico (Normal, Low Speed, 1 channel): 10 mA @ 5 VDC EmStat Pico (Hibernate): 10 uA @ 5 VDC Arduino MKR Zero (maximum rating): 600 mA @ 5 VDC 11 04.11.2021

12. Power consumption - measured EmStat Pico (Normal, 1 channel) + Arduino MKR Zero: 40 - 70 mA @ 5 VDC (Linear Sweep Voltammetry) Arduino MKR Zero: 20 mA @ 5 VDC (only CPU and UART) 12 04.11.2021

13. Power consumption - estimated Measuring mode 80 mA @ 5 VDC for approx. 10 s (depends on the measurement script) Sleep mode: 30 uA @ 5 VDC for approx. 15 min (depends on the scenario) Calculated consumption: 0,92 mAh @ 5 VDC 13 04.11.2021

14. Future plans Study with the E.coli culture to induce the growth of enzyme by the bacteria itself and obtain the 8-HQ (electroactive species) to be detected electrochemically (half yearly progress report) Calibration of the E.coli conc. detection to attain the LOD (half yearly progress report) 14 04.11.2021

15. Future plans Implement communication protocol (waiting for the description) Design and implement business logic of the sensing module Design and implement the measurement scripts (will be defined by MENDELU) Debugging (connection with potentiostat, script handling) Reduce power consumption if needed 15 04.11.2021

16. Thank you for the Attention Questions ?