▎ 摘　　要

NOVELTY - The apparatus has a channel made of three-dimensional graphene foam. A hydrophilic agent is formed on the graphene, where variation in a property of a graphene-based transistor (22) forms a basis for a measurement by a sensor e.g. biological sensor, strain sensor, pH sensor and chemical sensor. The biological sensor is configured for in-vivo measurements. A scaffold incorporates the graphene-based transistor. The graphene-based transistor is formed on a substrate (24). Graphene layers are naturally suspended above the substrate. USE - FET apparatus. ADVANTAGE - The transistor includes metal contacts for a source terminal and a drain terminal such that the graphene layers in the foam are naturally suspended above the substrate, thus suppressing undesirable substrate effects by plague conventional two-dimensional graphene transistors and achieving high carrier mobility. DESCRIPTION OF DRAWING(S) - The drawing shows a top view of a liquid gated graphene transistor. Graphene-based transistor (22) Substrate (24) Active channel layer (26) Source terminal (28) Drain terminal (30)