▎ 摘　　要

NOVELTY - Graphene transistor DNA sensor comprises (a) a substrate, and a grid electrode provided on the substrate, (b) a source electrode and a drain electrode, (c) a graphene channel being arranged between the source electrode and the drain electrode, and (d) a carbon dot being fixed on the surface of the grid electrode, and a single-stranded probe DNA being connected to the carbon dots to detect complementary DNA. USE - The graphene transistor DNA sensor is useful for detecting DNA (claimed). ADVANTAGE - The graphene transistor DNA sensor has minimum detection limit of DNA of 10-12 M, and detects DNA with high sensitivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the graphene transistor DNA sensor, which involves (a) preparing grid electrode, source electrode and drain electrode on the surface of the substrate to provide a channel between the source and the drain electrode, (b) paving graphene on the channel between the source and drain electrode to obtain a graphene transistor, (c) fixing carbon dots on the grid surface of the graphene transistor, and (d) connecting single-stranded probe DNA to the surface of the fixed carbon dot to obtain a graphene transistor DNA sensor.