We have developed a 3 mm X 3 mm graphene chip with an array of two terminal devices, connected in parallel, in which each individual device consists of a monolayer graphene suspended over multiple cavities and clamped by two metal contacts. Suspended graphene, as opposed to substrate-based graphene, significantly reduces the surface charge hindrances and allows for ultrasensitive detection of electroactive signals. The fabricated graphene chip has been successfully tested as a VOC and electrochemical sensor. Currently, testing is underway to use the device as an electrochemical dopamine sensor. We intend to discuss initial electrochemical dopamine sensing results as well as to explore possible collaborations with research groups for testing the graphene chip as an in-vitro neurotransmitter sensor.
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