Conductive poly 3,4-ethylene dioxy thiophene film and preparation method thereof

Abstract

The invention discloses a conductive poly 3,4-ethylene dioxy thiophene film and a preparation method thereof. The method is characterized by comprising the following steps: resolving a poly 3,4-ethylene dioxy thiophene monomer in an organic solvent, resolving supporting electrolyte into water, and preparing into solutions; transferring the two solutions stepwise into an reactor, thus forming a liquid-liquid interface; inserting a working electrode in the liquid-liquid interface; placing an auxiliary electrode and a reference electrode in the supporting electrolyte solution; and carrying out electrochemical polymerization by utilizing an electrochemistry means. The invention has the advantages that the prepared poly 3,4-ethylene dioxy thiophene film has good conductivity, and the topography has obvious dual character. One side, which is close to the water phase, of the conductive poly 3,4-ethylene dioxy thiophene film is a nano smooth film; the other side, which is close to the oil phase, of the conductive poly 3,4-ethylene dioxy thiophene film is a micrometer ordered cellular porous film; and a high reaction area is revealed, and the conductive poly 3,4-ethylene dioxy thiophene film can be used for positive electrode materials and negative electrode materials of super capacitors and batteries, electromagnetic shielding materials and the like.

Description

[0001] technical field [0002] The invention relates to a conductive poly-3,4-ethylenedioxythiophene film and its preparation method, in particular to a conductive poly-3,4-ethylenedioxythiophene film with a unique micro-nano structure and its preparation method, belonging to polymer materials field. Background technique [0003] Conjugated conductive polymers such as polypyrrole, polyaniline, polythiophene and their derivatives have unique structural characteristics, doping mechanism, and excellent physical and chemical properties, making them a hot field of materials science in the late 20th century. widespread attention from science and industry. Poly(3,4-ethylenedioxythiophene) (abbreviated as PEDOT), developed by Bayer Company in Germany in the late 1980s, has attracted much attention due to its excellent properties such as high conductivity, high stability, and high transparency. [0004] At present, the preparation methods of conductive polymers mainly include chem...

AI Technical Summary

Problems solved by technology

"Non-aqueous system" polymerization: that is, using organic solvents (cyanide is the most common) or ionic liquids as solvents, dissolving both the supporting electrolyte and the monomers in this solvent for polymerization, however, due to the choice of organic solvents or preparation of ionic liquids The raw materials have certain toxicity, which will cause harm to the human body and the environment, and the cost of supporting electrolytes used in these systems is relatively high, so "non-aqueous system polymerization" is facing environmental and economic pressures

"Emulsion system" polymerization: that is, to form an emulsion by adding surfactants or ultrasound to increase the solubility of monomers in water, which can promote efficient polymerization and avoid the use of toxic reagents. However, due to surface activity The participation of additives is not conducive to the separation of products. Although the ultrasonic emulsification method does not introduce any foreign substances and has high polymerization efficiency, the emulsion has a short stable time and is only suitable for small-scale production in a short period of time.

[0005] The traditional homogeneous system electrochemical polymerization can effectively control the synthesis of conductive polymers by adjusting the electrode potential. The product components are simple and easy to separate, but the polymerization is limited to the surface of the working electrode, and the size and shape of the generated conductive polymer film are directly affected by It is controlled by the selected working electrode, and because the generated polymer adheres to the surface of the working electrode, it needs to be used together with the working electrode or scraped off the polymer from the surface of the working electrode, which is not suitable for large-scale production, and also faces Choice of solvent and supporting electrolyte

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