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Flexible and water-stable graphene-based electrodes for long-term use in bioelectronics
G Murastov1, E Bogatova1, K Brazovskiy1
1Tomsk Polytechnic University, Lenina ave. 30, 634034, Tomsk, Russia.
Biosensors & Bioelectronics
|August 5, 2020
Summary
Researchers developed novel dry bioelectrodes using laser-reduced graphene oxide (rGO) on flexible substrates. These stable, high-performance electrodes offer a reliable alternative for wearable biosensors without hydrogels.
Area of Science:
- Materials Science
- Biomedical Engineering
- Nanotechnology
Background:
- Standard Ag/AgCl bioelectrodes often require hydrogels for skin contact, posing challenges for long-term wear.
- Existing dry electrodes, such as capacitive or other types, can suffer from low signal-to-noise ratios.
- There is a need for robust, stable, and high-performance dry bioelectrode technology for wearable applications.
Purpose of the Study:
- To demonstrate the first dry bioelectrode technology based on laser-reduced graphene oxide (rGO) on flexible polyethylene terephthalate (PET) substrates.
- To address the limitations of hydrogel-based and low-performance dry electrodes.
- To develop a stable and reliable dry bioelectrode suitable for long-term use in various environments.
Main Methods:
- Fabrication of bioelectrodes using laser-induced reduction of graphene oxide (GO) on PET substrates.
- Evaluation of electrode stability in buffer solutions across a pH range (4.8-9.2) for 24 hours.
- Assessment of long-term stability (100 hours) in harsh environments and during skin contact.
- Performance comparison with commercial state-of-the-art electrodes, focusing on signal-to-noise ratio.
Main Results:
- Achieved long-term stability of the dry rGO bioelectrodes for up to 100 hours, even in harsh conditions.
- Demonstrated robustness across a wide pH range (4.8-9.2) over 24 hours.
- Exhibited a signal-to-noise ratio comparable to commercial electrodes, with over 98% signal match.
- Confirmed rGO/PET composite formation via mechanical and visual analysis, attributing stability to interface modification during laser processing.
Conclusions:
- Developed a novel, stable, and high-performance dry bioelectrode using laser-reduced graphene oxide on flexible PET.
- The rGO/PET composite offers superior stability and reliability compared to existing dry electrode technologies.
- The simple, cost-effective, maskless, and scalable fabrication method enables sustainable manufacturing of flexible electrodes for biomedical sensors and wearables.
