Fig. 1: Multichannel hybrid graphene electrode array to monitor brain activity and electrochemical characterization.
From: Hybrid graphene electrode for the diagnosis and treatment of epilepsy in free-moving animal models
a Photograph of the 32-channel hybrid graphene (Gr/Au/Gr) electrode array on an artificial model of the cortex. b Schematic illustration of device fabrication. c Photograph of a device on the rat brain (left) and TEM image of the hybrid graphene-like thin film used in the electrode array (right). d Electrochemical impedance spectroscopy (EIS) of the hybrid graphene electrode and Au (40 nm) electrode for a 1 × 1 cm2 area in PBS and the equivalent circuit model fitted with the EIS measurement results. The hybrid graphene electrode shows lower impedance. e Cyclic voltammetry results of both electrodes with a scan rate of 200 mV/s. f Long-term stability and g relative impedance with the cyclic electrical stimulation test of the hybrid graphene electrode.
