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Iridium Oxide-reduced Graphene Oxide Nanohybrid Thin Film Modified Screen-printed Electrodes as Disposable Electrochemical Paper Microfluidic pH Sensors

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A flexible IrO₂ membrane for pH sensing.

Shih-Cheng Chou¹, Yi-Chieh Hsieh¹, Wai-Hong Cheang¹

¹Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, 300, Taiwan, ROC.

Scientific Reports

|July 9, 2022

Summary

This study developed a novel flexible pH sensor using iridium oxide nanoparticles on a functionalized polypropylene micromembrane. The sensor demonstrates a super-Nernstian response and stable performance, indicating potential for wearable electronics.

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Area of Science:

Materials Science
Nanotechnology
Sensor Technology

Background:

Polypropylene micromembranes (PPMM) are typically hydrophobic.
Developing flexible and sensitive pH sensors is crucial for wearable and implantable electronics.

Purpose of the Study:

To create a hydrophilic and conductive PPMM for pH sensing.
To evaluate the performance of iridium oxide (IrO2) nanoparticle-decorated PPMM as a flexible pH sensor.

Main Methods:

Surface functionalization of PPMM with polydopamine (PDA) and polyvinyl alcohol (PVA).
Electroless gold (Au) deposition followed by IrO2 nanoparticle coating.
Characterization using scanning electron microscopy (SEM).
Evaluation of pH-sensing performance in aqueous solutions (pH 2-12).

Main Results:

Uniform IrO2 nanoparticle formation on Au-coated PP fibers confirmed by SEM.
Achieved a super-Nernstian pH response with a slope of -74.45 mV/pH.
Demonstrated stable sensing performance after 5000 bending cycles with modest hysteresis.
Negligible bio-toxicity observed in cell viability tests.

Conclusions:

The PDA/PVA functionalized and IrO2-decorated PPMM serves as an effective flexible pH sensor.
The developed sensor shows promise for applications in wearable and implantable electronic devices.
This strategy offers a new pathway for creating advanced conductive polymeric membranes for sensing.