▎ 摘　　要

NOVELTY - Preparing carbon nanotube (CNT) printing electrode involves (a) adding 2-5 pts. wt. super-dispersant DC-02, 75-80 pts. wt. water, stirring and dissolving, adding 1.4-2.3 pts. wt. carbon nano-tube, dispersing for 10-15 minutes at a rotating speed of 1500 revolutions/minutes, grinding for 6-7 hours, adding 16-18 pts. wt. graphene nanosheet, continuously grinding for 10 hours after finishing, adding the graphene carbon nano-tube nanometre suspension; (b) mixing 82-85 pts. wt. graphene/carbon nanotubes nano suspension, 15-18 pt. aqueous acrylic resin, 0.1-0.3 pts. wt.leveling agent, and 0. 1-0.3 pts. wt. wetting dispersant to obtain nano coating; and (c) coating the nano coating on the working electrode of the carbon printing electrode by a dispensing machine, the thickness of the wet film is 9-13 m, drying to obtain the modified printing electrode of the graphene carbon nano-tube nano coating, namely GNP-CNT printing electrode. USE - Method for preparing carbon nanotube (CNT) printing electrode, where the GNP-CNT printing electrode is used for measuring the dopamine by the electrochemical work station (claimed). ADVANTAGE - The carbon nano technology for simply constructing the working electrode, the prepared printing electrode can quickly detect the dopamine in the blood, well overcomes the disadvantages of expensive cost, low sensitivity. The method is simple, the raw material is easy to obtain, and it has characteristics: the CNT is distributed between the GNP nano sheet in a monodisperse state, forming the three-dimensional conductive network structure shape of nano-tube bridged nano sheet, which is good for forming a high electronic transmission channel; the micro-nano surface is formed to have a large ratio surface which can effectively increase the electrode reaction rate; CNT and GNP has a large structure and the detection substance DA can form electron donor-electron acceptor interaction. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a GNP-CNT printed electrode prepared by the preparation method.