Preparation method and product of Bi4Ti3O12 nanosheets

A nanosheet and precursor solution technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve problems such as affecting the purity of the target product, and achieve the effects of easy large-scale production, simple preparation process, and easy control.

Inactive Publication Date: 2014-12-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But with Bi(NO 3 ) 3 As a raw material, Bi(NO 3 ) 3 Hydrolysis occurs to generate BiONO 3 , resulting in a large amount of Bi in the hydrothermal reaction product 2 o 3 or pyrochlore compared to 2 Ti 2 o 7 Impurities, which affect the purity of the target product

Method used

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  • Preparation method and product of Bi4Ti3O12 nanosheets
  • Preparation method and product of Bi4Ti3O12 nanosheets
  • Preparation method and product of Bi4Ti3O12 nanosheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Weighing 6 mmol of tetrabutyl titanate and dissolving it in ethylene glycol methyl ether to finally obtain an ethylene glycol methyl ether solution with a tetrabutyl titanate concentration of 0.4 mol / L. Weigh KOH, dissolve it in deionized water, and control the concentration of KOH to 1mol / L

[0036] 2) Under stirring, add the KOH solution prepared in step 1) dropwise to the tetrabutyl titanate ethylene glycol methyl ether solution prepared in step 1), so that tetrabutyl titanate is hydrolyzed to obtain titanium oxyhydroxide matter precipitation. Thereafter, wash and filter with deionized water more than 3 times.

[0037] 3) Weigh 8mmol of ammonium bismuth citrate, dissolve it in deionized water, and finally obtain an aqueous solution of ammonium bismuth citrate with a concentration of 0.4mol / L;

[0038] 4) Under stirring, disperse the precipitated titanium oxyhydroxide prepared in step 2) in the aqueous solution of ammonium bismuth citrate prepared in step 3), for...

Embodiment 2

[0045] 1) Weighing 6 mmol of tetrabutyl titanate and dissolving it in ethylene glycol methyl ether to finally obtain an ethylene glycol methyl ether solution with a tetrabutyl titanate concentration of 0.5 mol / L. Weigh KOH, dissolve it in deionized water, and control the concentration of KOH to 2mol / L.

[0046] 2) Under stirring, add the KOH solution prepared in step 1) dropwise to the tetrabutyl titanate ethylene glycol methyl ether solution prepared in step 1), so that tetrabutyl titanate is hydrolyzed to obtain titanium oxyhydroxide matter precipitation. Thereafter, wash and filter with deionized water more than 3 times.

[0047] 3) Take 8mmol of ammonium bismuth citrate, dissolve it in deionized water, and finally obtain an aqueous solution of ammonium bismuth citrate with a concentration of 0.5mol / L;

[0048] 4) Under stirring, disperse the precipitated titanium oxyhydroxide prepared in step 2) in the aqueous solution of ammonium bismuth citrate prepared in step 3), for...

Embodiment 3

[0053] 1) Weigh 6 mmol of tetrabutyl titanate, dissolve it in ethylene glycol methyl ether, and finally obtain an ethylene glycol methyl ether solution with a tetrabutyl titanate concentration of 0.7 mol / L. Weigh KOH, dissolve it in deionized water, and control the concentration of KOH to be 3mol / L

[0054] 2) Under stirring, add the KOH solution prepared in step 1) dropwise to the tetrabutyl titanate ethylene glycol methyl ether solution prepared in step 1), so that tetrabutyl titanate is hydrolyzed to obtain titanium oxyhydroxide matter precipitation. Thereafter, wash and filter with deionized water more than 3 times.

[0055] 3) Weigh 8mmol of ammonium bismuth citrate, dissolve it in deionized water, and finally obtain an aqueous solution of ammonium bismuth citrate with a concentration of 0.7mol / L;

[0056] 4) Under stirring, disperse the precipitated titanium oxyhydroxide prepared in step 2) in the aqueous solution of ammonium bismuth citrate prepared in step 3), formin...

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Abstract

The invention discloses a preparation method of Bi4Ti3O12 nanosheets. The preparation method comprises the following steps: by adopting titanium oxyhydroxide precipitate which is prepared by hydrolyzing tetrabutyl titanate by using KOH as a titanium source, sufficiently dispersing the titanium oxyhydroxide precipitate into an ammonium bismuth citrate solution, subsequently adding certain amount of potassium hydroxide as a mineralizer, sufficiently stirring and oscillating, transferring into a reaction kettle, sealing, and performing hydrothermal treatment for 6-48 hours at 150-300 DEG C, thereby finally obtaining the Bi4Ti3O12 single crystal nanosheets of which the thickness is about 100 nanometers and the two-dimensional size is greater than 1 micrometer. The invention provides the method for preparing the Bi4Ti3O12 nanosheets by using a hydrothermal method, ammonium bismuth citrate is adopted as a bismuth source for the first time, no other surface modifier is needed to be added, the Bi4Ti3O12 nanosheets with relatively good dispersity are prepared by precisely regulating and controlling the reaction condition, and the preparation process is simple and controllable.

Description

technical field [0001] The present invention relates to the preparation method of bismuth titanate material, relate in particular to a kind of Bi 4 Ti 3 o 12 Nano sheet preparation method and product. Background technique [0002] It is well known that the structure and morphology of materials have an important impact on their physical and chemical properties, which has also triggered a lot of research on micro-nano materials with various morphological structures. Ferroelectric materials with properties such as ferroelectricity, piezoelectricity, pyroelectricity, electro-optic and nonlinear optics are also an important class of functional materials, and the research on their preparation and properties has become a research hotspot today. [0003] Bi 4 Ti 3 o 12 It has a high Curie temperature and polarization strength, and the Curie temperature of its ferroelectric phase transition is 750 ° C. It also has many advantages such as a low dielectric constant and significan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00B82Y30/00B82Y40/00
Inventor 徐刚白惠文邓世琪沈鸽韩高荣
Owner ZHEJIANG UNIV
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