▎ 摘　　要

NOVELTY - Screening and separating graphene comprises: providing at least one pair of electrodes and an energy barrier layer; covering the pair of electrodes and the energy barrier layer with a graphene suspension (160); changing a bias voltage between the first electrode and the second electrode of the pair of electrodes and measuring a corresponding tunneling current when a graphene sheet (130) in the graphene suspension materially couples the second electrode and the energy barrier layer; and performing screening and separation using differential conductance of different layers of graphene. USE - The method is useful for screening and separating graphene (claimed). ADVANTAGE - The method is capable of screening and separating graphene with improved mechanical strength, flexibility and surface resistance. DETAILED DESCRIPTION - Screening and separating graphene comprises: providing at least one pair of electrodes and an energy barrier layer, where the pair of electrodes is a first electrode (111) and a second electrode (110), and the energy barrier layer is formed on the first electrode; covering the pair of electrodes and the energy barrier layer with a graphene suspension (160); changing a bias voltage between the first electrode and the second electrode of the pair of electrodes and measuring a corresponding tunneling current when a graphene sheet (130) in the graphene suspension materially couples the second electrode and the energy barrier layer and is located above the first electrode; and performing screening and separation using differential conductance of different layers of graphene. An INDEPENDENT CLAIM is included for a graphene screening and separation device (100) comprising the pair of electrodes, the energy barrier layer and a measurement unit including a voltage source and a nanoamp current meter electrically coupled to the first and second electrodes of the pair of electrodes, where a corresponding tunneling current is measured according to the bias voltage. DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a graphene screening and separation device. Graphene screening and separation device (100) Second electrode (110) First electrode (111) Graphene sheet (130) Graphene suspension. (160)