Multiplexed neural sensor array of graphene solution-gated field-effect transistors

Nathan Schaefer, Ramon Garcia-Cortadella, Javier Martínez-Aguilar, Gerrit Schwesig, Xavi Illa, Ana Moya Lara, Sara Santiago, Clement Hébert, Gonzalo Guirado, Rosa Villa, Anton Sirota, Anton Guimerà-Brunet, Jose A. Garrido

Research output: Contribution to journalArticleResearchpeer-review

13 Citations (Scopus)

Abstract

Electrocorticography (ECoG) is a well-established technique to monitor electrophysiological activity from the surface of the brain and has proved crucial for the current generation of neural prostheses and brain-computer interfaces. However, existing ECoG technologies still fail to provide the resolution necessary to accurately map highly localized activity across large brain areas, due to the rapidly increasing size of connector footprint with sensor count. This work demonstrates the use of a flexible array of graphene solution-gated field-effect transistors (gSGFET), exploring the concept of multiplexed readout using an external switching matrix. This approach does not only allow for an increased sensor count, but due to the use of active sensing devices (i.e. transistors) over microelectrodes it makes additional buffer transistors redundant, which drastically eases the complexity of device fabrication on flexible substrates. The presented results pave the way for upscaling the gSGFET technology towards large-scale, high-density μECoG-arrays, eventually capable of resolving neural activity down to a single neuron level, while simultaneously mapping large brain regions.

Original languageEnglish
Article number025046
Journal2D materials
Volume7
Issue number2
DOIs
Publication statusPublished - Apr 2020

Keywords

  • flexible probes
  • graphene solution-gated field-effect transistor
  • multiplexed μECoGs
  • neurosensing

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