Helical graphene nanoribbon for organic electrochemical transistors and conformable electrode array

A conformable electrode array for recording electrical signals from neural tissue of a subject, comprising:

• a substrate;
• a plurality of electrodes patterned on the substrate;
• and
• a conductive coating disposed on at least one of the electrodes, the conductive coating comprising a helical graphene nanoribbon (hGNR) having oligoethylene glycol-functionalized imide groups along cove edges of the nanoribbon,
• wherein the conformable electrode array is configured to interface with the neural tissue to record the electrical signals therefrom.

An organic electrochemical transistor (OECT), the transistor comprising:

• a channel layer comprising a helical graphene nanoribbon (hGNR) having a defect-free extended graphitic backbone and a plurality of oligoethylene glycol-functionalized imide groups along cove edges of the hGNR;
• a substrate having the channel layer patterned thereon;
• a source electrode and a drain electrode in electrical communication with the channel layer;
• and
• a gate electrode configured to modulate ionic and electronic transport within the channel layer through an electrolyte.