Flexible and water-stable graphene-based electrodes for long-term use in bioelectronics

G. Murastov, E. Bogatova, K. Brazovskiy, I. Amin, A. Lipovka, E. Dogadina, A. Cherepnyov, A. Ananyeva, E. Plotnikov, V. Ryabov, R. D. Rodriguez, E. Sheremet

Research output: Contribution to journalArticle

Abstract

We present the first demonstration of bioelectrodes made from laser-reduced graphene oxide (rGO) on flexible polyethylene terephthalate (PET) substrates that overcome two main issues: using hydrogel on skin interface with standard Ag/AgCl bioelectrodes vs. low signal to noise ratio with capacitance or dry electrodes. Today we develop a dry rGO bioelectrode technology with long-term stability for 100 h in harsh environments and when in contact with skin. Reliability tests in different buffer solutions with pH from 4.8 to 9.2 tested over 24 h showed the robustness of rGO electrodes. In terms of signal to noise ratio, our bioelectrodes performance is comparable to that of commercial ones. The bioelectrodes demonstrate an excellent signal to noise ratio, with a signal match of over 98% with respect to state-of-the-art electrodes used as a benchmark. We attribute the unique stability of our bioelectrodes to the rGO/PET interface modification and composite formation during laser processing used for GO reduction. The rGO/PET composite formation assertion is confirmed by mechanical stripping experiments and visual examination of re-exposed PET. The method developed here is simple, cost-effective, maskless, and can be scaled-up, allowing sustainable manufacture of arbitrary-shaped flexible electrodes for biomedical sensors and wearables.

Original languageEnglish
Article number112426
JournalBiosensors and Bioelectronics
Volume166
DOIs
Publication statusPublished - 15 Oct 2020

Keywords

  • 2D materials
  • Bioelectrodes
  • Cardiography
  • Laser processing
  • Laser-reduction
  • Reduced graphene oxide
  • TOC graph

ASJC Scopus subject areas

  • Biotechnology
  • Biophysics
  • Biomedical Engineering
  • Electrochemistry

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