▎ 摘　　要

NOVELTY - Flexible conductive composite material with nano mesh and flower-like structures comprises a flexible substrate, and reduced graphene oxide nanosheets and conductive polymers supported on the flexible substrate, where the reduced graphene oxide nanosheets are obtained by reducing the graphene oxide nanosheets supported on flexible substrate surface by a gas phase reduction method and forming fluffy scales and groove structures on the flexible substrate surface, the conductive polymer is supported on the surface of the reduced graphene oxide nanosheets to form a three-dimensional nano-network and flower-like multi-level structure together, the 3-dimensional nano-network structure comprises nanowires composed of the reduced graphene oxide nanosheets and conductive polymers, and the flower-like structure comprises sheets of reduced graphene oxide nanosheets with the conductive polymer loaded on the surface to improve the electrical performance of the conductive composite material. USE - The composite material is useful for preparing immunoglobulin G or immunoglobulin M biosensors, batteries and capacitors application, where the biosensor comprises an organic electrochemical transistor, in which the surface of gate electrode of it is modified with immunoglobulin G or immunoglobulin M antigen targeting molecules, and the source, drain electrodes and gate electrodes of the transistor are made of the composite material (all claimed). ADVANTAGE - The composite material has high specific surface area, increases carrier migration rate and ion exchange rate, and improves electrical performance. The organic electrochemical transistor has transconductance value of 40-100 mS. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the flexible conductive composite material involving (a) immersing and adsorbing the flexible substrate in the graphene oxide nanosheet solution to obtain a flexible substrate supporting graphene nanosheets, (b) carrying out plasma chemical vapor reduction using an atmosphere containing nitrogen on the flexible substrate supporting graphene oxide nanosheets to obtain a flexible substrate supporting nitrogen-doped reduced graphene oxide nanosheets, and (c) adding the nitrogen-doped reduced graphene oxide nanosheet-loaded flexible substrate in a surfactant solution, stirring uniformly under ice bath conditions, adding conductive monomers to the solution, stirring uniformly, slowly adding the oxidant, stirring at high speed under ice bath conditions and reacting to obtain the product.