Polyaniline-modified graphene conductive composite film and preparation method thereof

Abstract

The invention discloses a polyaniline-modified graphene conductive composite film and a preparation method thereof, belonging to the technical field of composite materials. The preparation method comprises the following steps: adding a small amount of aniline monomer into a graphene oxide acidic dispersion solution, stirring uniformly, adding an initiator ammonium persulfate powder to initiate in-situ polymerization, and carrying out layer-by-layer self-assembly to obtain a polyaniline-modified graphene oxide film; and finally, carrying out reduction treatment on the obtained polyaniline-modified graphene oxide film, washing and drying to obtain the high-dispersity high-conductivity polyaniline-modified graphene composite conductive material. The modification of the small amount of conductive high-polymer polyaniline on the graphene can effectively improve the conductivity and dispersity of the graphene; the acidic reducer hydriodic acid can reduce the graphene oxide on the premise of not changing the doping state of the polyaniline, and has the advantages of simpler operation process, convenient technique, low cost and no toxicity as compared with common alkaline hydrazine reducers.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a polyaniline-modified graphene conductive composite film and a preparation method thereof. Background technique [0002] Graphene, as a typical two-dimensional material, has received extensive attention and research since it was first discovered in 2004. Graphene has many excellent properties, such as hardness more than 100 times that of steel, high light transmittance, high thermal conductivity, high electron mobility, etc. At present, the preparation methods of graphene mainly include vapor phase deposition method, SiC thermal decomposition method, mechanical exfoliation method and redox method. Due to the advantages of simple operation, low cost and wide range of raw materials, the redox method has received a lot of attention and research. However, there are some irreparable defects in the structure of graphene prepared by redox method, which greatly affects i...

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Problems solved by technology

[0003] Many related graphene-polyaniline composite materials and related preparation methods have been disclosed in the prior art. For example, the patent application number 2011110293397.4 discloses a high-concentration graphene-polyaniline nanofiber composite dispersion and the preparation of a composite film. Method, the method is by ultrasonically mixing the dispersion of graphene oxide and polyaniline to form a composite dispersion, and then through reduction, vacuum filtration to prepare a composite film, the conductivity of the composite conductive film is 1200S / m, but This method simply mixes graphene oxide and polyaniline physically without substantial chemical connection, and the pickling process after reduction is cumbersome; the patent application number 201010287916.1 discloses a conductive polyaniline-graphene composite The synthesis method of the invention, the invention first in-situ polymerization of aniline in the dispersion of graphene oxide, prepared polyaniline-graphene oxide composite, and then prepared polyaniline-graphene composite by heating reduction with hydrazine, The method is simple and easy to operate, but hydrazine, as a basic reducing substance, has a huge impact on the conductivity of polyaniline, making it change from a conductive doped state to a non-conductive intrinsic state, so the prepared polyaniline The electrical conductivity of aniline-graphene composites is not excellent enough; the patent application number 201210274455.3 discloses a preparation method of graphene and polyaniline composite paper and its products. In this invention, the mixed dispersion liquid of graphene oxide and reducing agent is first Coated on the substrate, after drying, polyaniline is deposited on it to obtain a graphene / polyaniline composite paper. Although the method is simple to operate, the graphene layer and the polyaniline layer rely on physical bonding. A good conductive path cannot be formed between them, so the conductivity is still not high; the patent application with the application number 201410517425.X discloses a one-step chemical preparation method of graphene / polyaniline composite materials, first dissolving graphite oxide in acetic acid solution In the process, add aniline monomer, mix uniformly by ultrasonic dispersion, then add reducing agent hydroiodic acid and dropwise add ammonium persulfate oxidant, stir magnetically, complete aniline in-situ polymerization while graphite oxide is reduced to graphene, wait After the reaction is complete, the graphene / polyaniline composite material can be obtained by filtering, washing, and drying. However, this application carries out the reduction of graphene oxide and the in-situ polymerization of aniline at the same time. Heteroacids participate in the polymerization of aniline. The preparation process is short, but the conductivity of the prepared graphene / polyaniline composite is still not ideal, and the conductivity is only 0.9S / cm

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