Soluble polyaniline conductive nanofiber and preparation method thereof

Abstract

The invention discloses a soluble polyaniline conductive nanofiber and a preparation method thereof. The fibers have smooth surfaces and uniform shapes, are crossed and automatically assembled to form a regular nanoscale three-dimensional net, and have the solubility of more than or equal to 10 mg / ml in a solvent which may be water, ethanol, ethylene glycol, N,N-dimethylformamide or dimethyl sulfoxide. The method comprises the following steps of: first mixing aniline with an auxiliary stabilizer with stirring to obtain oil phase liquid, mixing an emulsifier with the water with stirring to obtain water phase liquid, mixing the oil phase liquid with the water phase liquid with stirring and placing the mixture in ultrasonic waves for homogenization to obtain miniemulsion; then adding protonic acid solution into the miniemulsion for stirring to obtain mixed solution, and adding the aqueous solution of oxidant dropwise into the mixed solution for reaction to obtain dark green solution; and finally performing centrifugation treatment on the dark green solution to obtain precipitates, washing the precipitates with the ethanol and the water, and drying the washed precipitates to obtain the soluble polyaniline conductive nanofibers. The polyaniline conductive nanofiber and the preparation method thereof can be widely used for the connection, functional units and the like of nanoscale electronic devices, photoelectronic devices, electrochemical devices and electromechanical devices.

Description

technical field [0001] The invention relates to a nanofiber and a preparation method thereof, in particular to a soluble polyaniline conductive nanofiber and a preparation method thereof. Background technique [0002] Among many conductive polymers, polyaniline is considered to be the most promising conductive polymer due to its easy availability of monomers, diverse structures, unique doping mechanism and good environmental stability. However, the conductive polyaniline synthesized by traditional chemical methods exhibits a granular aggregate structure, which has the disadvantages of insoluble, infusible and poor processability, which makes it difficult to realize industrial production of polyaniline. The preparation of conductive polyaniline with nanofibrous structure is one of the effective ways to improve its processability and mechanical properties. Polyaniline nanofibers have different electronic, optical, chemical, and thermal properties than bulk polyaniline, and pl...

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Problems solved by technology

However, both polyaniline conductive nanofibers and their preparation methods have shortcomings. First, the surface of polyaniline conductive nanofibers is rough, the shape is irregular, and the fibers are partially agglomerated and there are a small number of micron particles on them. Grade spherical particles, the intertwining of fibers is irregular and disorderly, without forming a good three-dimensional network structure; secondly, polyaniline conductive nanofibers are only well soluble in methylpyrrolidone and formic acid, which limits its application range; again, the repeatability of the preparation method is poor, and the increase of the polymerization time will bring spherical products, and the aniline in the required raw material needs to be distilled under reduced pressure, and the polymerization reaction needs to spend at least 24 hours at a low temperature of 0 ° C, so that it consumes energy, time-consuming, and difficult for large-scale industrial production

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