Preparation method of core-shell type highly dielectric filler from barium titanate-doped multi-walled carbon nanotubes

Abstract

The invention provides a preparation method of a core-shell type highly dielectric filler from barium titanate-doped multi-walled carbon nanotubes. The filler is prepared through an impregnation sintering method, the surface energy of the acidified multi-walled carbon nanotubes is reduced by the use of an anionic surfactant of sodium dodecyl benzene sulfonate (SDBS), the adsorption of ions on the acidified multi-walled carbon nanotubes is promoted in the impregnation process, the hydrolysis of a sol-gel impregnation liquid formed from barium acetate and tetrabutyl titanate in an acetic acid and ethanol system is carried out on the surfaces of the acidified multi-walled carbon nanotubes to form a continuous gel layer, and the gel layer is subjected to vacuum drying and high temperature calcination at 800 DEG C under nitrogen atmosphere. The preparation process includes firstly preparing the barium acetate and tetrabutyl titanate sol-gel impregnation liquid, then adding the acidified multi-walled carbon nanotubes, and reacting at room temperature. The core-shell type multi-walled carbon nanotube highly dielectric filler is finally obtained through the regulation of the surfactant. The inventive method is simple in conditions, is an effective way for the preparation of a multifunctional core-shell type multi-walled carbon nanotube composite, and has flexible and wide applicability and industrialized prospects.

Description

technical field [0001] The invention relates to a preparation method for promoting barium titanate-coated multi-wall carbon nanotubes to form core-shell composite powders by surfactants, and belongs to the technical field of composite material preparation. Background technique [0002] Carbon nanotubes are one-dimensional quantum materials with a special structure (the radial dimension is on the order of nanometers, and the axial dimension is on the order of micrometers), and it has become one of the research hotspots worldwide in the past two decades. It has been widely researched and applied in many fields such as field emission, molecular electronic devices, composite reinforced materials, hydrogen storage materials, and catalyst supports. With the passage of time, the research direction of carbon nanotubes has gradually shifted to multifunctionality. In recent years, the method of using the one-dimensional framework of carbon nanotubes to modify the surface of carbon na...

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Problems solved by technology

The study also found that adding the cationic surfactant cetyltrimethylammonium bromide (CTAB) can only form a nano-barium titanate particle layer on the surface of the multi-walled carbon nanotubes, and it is impossible to obtain a continuous coating layer.

The main reason is that the benzene ring structure in SDBS can form a conjugated structure with the acidified multi-walled carbon nanotube wall, so that SDBS can attach a large number of carbon nanotube tube walls, which not only improves the acidified multi-walled carbon nanotube wall in solution. Dispersion also reduces the surface energy of the acidified multi-walled carbon nanotubes, resulting in the barium titanate gel can be uniformly and continuously attached to the surface of the acidified multi-walled carbon nanotubes, and a uniform barium titanate coating layer is obtained after the calcination treatment. However, the effect of CTAB on acidified MWNTs is weak, which can only improve the dispersion of acidified MWNTs in the impregnation solution to a certain extent, and cannot obtain a continuous and uniform coating layer.

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