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Method for preparing BaTiO3 / multi-wall carbon nano-tube (MWCNTs) nano composite material

A technology of multi-walled carbon nanotubes and nanocomposite materials, applied in titanium compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of room temperature resistivity increase, density decrease, electron mobility increase, etc., and achieve simple production equipment. , good crystallization, uniform particle distribution effect

Inactive Publication Date: 2009-07-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Qing Huang et al. BaTiO 3 Composite with carbon nanotubes and sintered in a nitrogen atmosphere, the results show that BaTiO 3 After compounding with carbon nanotubes, the firing temperature drops to 1200°C, and the electron mobility increases, but with the addition of carbon nanotubes, the room temperature resistivity increases and the density decreases [J.Mater.Chem.2004(14): 2536- 2541.]

Method used

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  • Method for preparing BaTiO3 / multi-wall carbon nano-tube (MWCNTs) nano composite material
  • Method for preparing BaTiO3 / multi-wall carbon nano-tube (MWCNTs) nano composite material
  • Method for preparing BaTiO3 / multi-wall carbon nano-tube (MWCNTs) nano composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Measure 40ml of concentrated nitric acid (15mol / L), and then measure 20ml of deionized water, mix and stir. Then weigh 0.5g MWCNTs into the above solution, ultrasonically disperse for 30min, and then heat to 120°C under magnetic stirring for 24h. After the reaction, the carbon tube suspension was filtered, washed and dried to obtain modified MWCNTs. 1.7 g of tetrabutyl titanate was dropped into a beaker containing 20 ml of absolute ethanol while magnetic stirring was performed. Prepare 0.1 mol / L ammonia solution, slowly drop the ammonia solution into the mixed solution of absolute ethanol and tetrabutyl titanate to obtain white precipitated Ti(OH) 4 , centrifuge and wash the product. The above modified MWCNTs and the generated Ti(OH) 4 Add a three-necked flask, then add 25ml of ethanolamine, 25ml of ethylenediamine, 5ml of deionized water, 3.825g of barium acetate, 2.4g of sodium hydroxide, 1ml of polyethylene glycol, 0.01g of polyvinylpyrrolidone, and the number of r...

Embodiment 2

[0035] Measure 40ml concentrated nitric acid (15mol / L), then measure 20ml deionized water, mix and stir. Weigh 0.4g MWCNTs into the above solution, ultrasonically disperse for 30min, and then heat to 110°C and stir magnetically for 36h. After the reaction, the carbon tube suspension is filtered, washed and dried to obtain modified MWCNTs. 2 g of tetrabutyl titanate was dropped into a beaker filled with 20 ml of absolute ethanol, and magnetic stirring was performed at the same time. Prepare a 0.5mol / L ammonia solution, and slowly drop the ammonia solution into the mixture of absolute ethanol and tetrabutyl titanate to obtain a white precipitate Ti(OH) 4 , Centrifuge and wash the product. The above modified MWCNTs and the generated Ti(OH) 4 Add a three-necked flask, then add 22ml ethanolamine, 22ml ethylenediamine, 5ml deionized water, 4.59g barium acetate, 2.6g sodium hydroxide, 1ml polyethylene glycol, 0.01g polyvinylpyrrolidone, and the rotation speed is 350r / min Stir at l...

Embodiment 3

[0038] Measure 50ml concentrated nitric acid (15mol / L), then measure 25ml deionized water, mix and stir. Weigh 0.5g MWCNTs into the above solution, ultrasonically disperse for 30min, and then heat to 100°C and stir magnetically for 24h. After the reaction, the carbon tube suspension is filtered, washed and dried to obtain modified MWCNTs. 2.7ml of tetrabutyl titanate was dropped into a beaker filled with 20ml of absolute ethanol, and magnetic stirring was performed at the same time. Prepare a 1mol / L ammonia solution, and slowly drop the ammonia solution into the mixture of absolute ethanol and tetrabutyl titanate to obtain a white precipitate Ti(OH) 4 , Centrifuge and wash the product. The above modified MWCNTs and the generated Ti(OH) 4 Add a three-necked flask, then add 25ml ethanolamine, 25ml ethylenediamine, 5ml deionized water, 6.12g barium acetate, 3.2g sodium hydroxide, 1ml polyethylene glycol, 0.01g polyvinylpyrrolidone, and the rotation speed is 350r / min Stir at lo...

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Abstract

The invention relates to a method for preparing a BaTiO3 / MWCNTs nano composite material, which comprises the following steps: using MWCNTs, barium acetate, sodium hydrate and tetrabutyl titanate as initial raw materials, using deionized water, ethylene diamine and ethanolamine as solvents, adopting concentrated nitric acid to modify the surface of the MWCNTs, using a tetrabutyl titanate hydrolysis product as a titanium source, adding a dispersant, namely polyethylene glycol and plasmosan into the mixture, and adopting a solvent hot method to obtain the BaTiO3 / MWCNTs nano composite material. By changing the proportion of the MWCNTs, the barium acetate and the tetrabutyl titanate, the BaTiO3 / MWCNTs nano composite material with different compositions can be obtained. The prepared BaTiO3 / MWCNTs nano composite material has good electric conductivity, the synthesis process and the production equipment are simple, and industrialized production is easy to realize.

Description

technical field [0001] The invention belongs to the field of preparation of nano-composite materials, in particular to a kind of barium titanate (BaTiO 3 ) / multi-walled carbon nanotubes (MWCNTs) nanocomposites. Background technique [0002] Barium titanate has been widely used as a dielectric material for ceramic capacitors, piezoelectric materials for microphones and other sensors. As a piezoelectric material, it largely replaces lead zirconate titanate, so barium titanate is also called piezoelectric ceramics (PZT). Polycrystalline barium titanate exhibits a positive temperature coefficient effect, making it a material for preparing thermistors and self-regulating electrothermal systems. [0003] Nanoparticles have physical effects such as surface effect, small size effect, quantum size effect and macroscopic quantum tunneling effect, which make the dielectric constant of fully dense nanocrystalline barium titanate as high as 40%, which is higher than that of other titan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C01G23/00C04B35/468C04B35/52C04B35/626
Inventor 李耀刚毕成王宏志张青红朱美芳
Owner DONGHUA UNIV
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