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G-Optrode Bio-Interfaces for Non-Invasive Optical Cell Stimulation: Design and Evaluation.

Vijai M Moorthy1, Parthasarathy Varatharajan2, Joseph D Rathnasami3

  • 1Department of Electronic Engineering, Howard College, University of KwaZulu-Natal, Durban 4041, South Africa.

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Graphene optrodes (G-optrodes) enable non-invasive optical stimulation of cells by converting light into electrical pulses. This study confirms graphene

Keywords:
G-optrodesbio-interfacebiocompatibilityelectrical device characterizationmicroelectronicsnanotechnologyneuronal cellsnon-invasiveoptical stimulation

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Area of Science:

  • Biomaterials Science
  • Neuroscience
  • Optoelectronics

Background:

  • Graphene nanoparticles' bio-interactions are crucial for biocompatibility and efficacy in biological applications.
  • Non-invasive electrical stimulation is required for analyzing and modulating cellular and device-level activity.
  • G-optrodes, graphene-based bio-interfaces, offer light-based cellular stimulation without genetic modification.

Purpose of the Study:

  • To investigate the impact of G-optrode-based substrate designs on optical stimulation of pheochromocytoma (PC-12) cells.
  • To evaluate the biocompatibility of graphene in substrate-based systems for neural stimulation.
  • To explore the potential of G-optrodes for biological and artificial retinal applications.

Main Methods:

  • Graphene electrodes (G-optrodes) were utilized to convert light energy into electrical energy for neural stimulation.
  • PC-12 cells were cultured on graphene substrates for 7 days to assess biocompatibility.
  • The study examined the optical stimulation effects of G-optrodes with varying illuminance and wavelength independence.

Main Results:

  • G-optrodes successfully converted light into electrical pulses for cellular stimulation.
  • Graphene was confirmed to be biocompatible in substrate-based systems.
  • 20-nm and 50-nm thick G-optrodes demonstrated potential for biological and artificial retinal applications.

Conclusions:

  • G-optrode bio-interfaces provide wavelength-independent stimulation sensitive to illuminance changes.
  • The biocompatibility of graphene is significant for the selection and application of G-optrodes in biomedical fields.
  • Substrate-based G-optrode designs show promise for advanced neural interfaces and artificial retinas.