About the Bionics Institute


Bionics Institute Research Online >
Neurobionics >
Neurobionics Research Publications >

Title: Soft, Flexible Freestanding Neural Stimulation and Recording Electrodes Fabricated from Reduced Graphene Oxide
Authors: Apollo, Nicholas
Maturana, Matias
Tong, Wei
Nayagam, David
Shivdasani, Mohit
Foroughi, Javad
Wallace, Gordon
Prawer, Steven
Ibbotson, Michael
Garrett, David
Keywords: neural interface
neural stimulation
graphene oxide
Issue Date: 4-May-2015
Publisher: John Wiley and Sons
Citation: Apollo, N. V., M. I. Maturana, W. Tong, D. A. X. Nayagam, M. N. Shivdasani, J. Foroughi, G. G. Wallace, S. Prawer, M. R. Ibbotson & D. J. Garrett (2015). Soft, Flexible Freestanding Neural Stimulation and Recording Electrodes Fabricated from Reduced Graphene Oxide. Advanced Functional Materials 25(23): 3551-3559
Abstract: There is an urgent need for conductive neural interfacing materials that exhibit mechanically compliant properties, while also retaining high strength and durability under physiological conditions. Currently, implantable electrode systems designed to stimulate and record neural activity are composed of rigid materials such as crystalline silicon and noble metals. While these materials are strong and chemically stable, their intrinsic stiffness and density induce glial scarring and eventual loss of electrode function in vivo. Conductive composites, such as polymers and hydrogels, have excellent electrochemical and mechanical properties, but are electrodeposited onto rigid and dense metallic substrates. In the work described here, strong and conductive microfibers (40–50 μm diameter) wet-spun from liquid crystalline dispersions of graphene oxide are fabricated into freestanding neural stimulation electrodes. The fibers are insulated with parylene-C and laser-treated, forming “brush” electrodes with diameters over 3.5 times that of the fiber shank. The fabrication method is fast, repeatable, and scalable for high-density 3D array structures and does not require additional welding or attachment of larger electrodes to wires. The electrodes are characterized electrochemically and used to stimulate live retina in vitro. Additionally, the electrodes are coated in a water-soluble sugar microneedle for implantation into, and subsequent recording from, visual cortex.
URI: http://repository.bionicsinstitute.org:8080/handle/123456789/206
Appears in Collections:Neurobionics Research Publications

Files in This Item:

File Description SizeFormat
2015-Apollo-cover no embargo.pdf65.67 kBAdobe PDFView/Open
View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


DSpace Software Copyright © 2002-2010  Duraspace -