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Preparation method of monodisperse barium titanate cubic nanometer particles

A technology of cubic nanometer and barium titanate, which is applied in the direction of titanate, nanotechnology, alkaline earth metal titanate, etc., can solve the problems of difficult control of grain shape and grain growth, and achieve good crystallization and crystallization Good performance, good monodispersity

Inactive Publication Date: 2019-03-01
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional solid-state sintering method generally causes unavoidable grain growth and the grain shape is difficult to control. Therefore, wet chemical methods are generally used to prepare barium titanate nanoparticles.

Method used

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  • Preparation method of monodisperse barium titanate cubic nanometer particles
  • Preparation method of monodisperse barium titanate cubic nanometer particles
  • Preparation method of monodisperse barium titanate cubic nanometer particles

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Effect test

Embodiment 1

[0023] Weigh 0.7887g of Ba(OH)·8H 2 O was dissolved in 50 ml of deionized water, 1.21 ml of di(2-hydroxypropionic acid)diammonium titanium dihydroxide (50 wt % aqueous solution) was added thereto, and fully stirred evenly. Add 11.25ml of 5M NaOH solution to the mixed precursor solution to adjust the pH value of the solution, then add 6.35ml oleic acid (OLA) under magnetic stirring, and transfer the above solution to a 100ml autoclave lining after stirring for 10min. At this time, 2.10 ml of tert-butylamine was added to the lining, and the sealed autoclave was placed at 220° C. for 72 hours, and then naturally cooled to room temperature. The precipitate was washed with dilute hydrochloric acid, then washed several times with deionized water and absolute ethanol, filtered, and dried at 60° C. in air to obtain barium titanate nanoparticles.

[0024] The XRD pattern of the product is as figure 1 As shown in , all the diffraction peaks of the sample are consistent with the standa...

Embodiment 2

[0026] Weigh 0.9465g of Ba(OH)·8H 2 O is dissolved in 50ml of deionized water, to which two (2-hydroxypropionic acid) diammonium dihydroxide titanium (50wt% aqueous solution) of 1.21ml is added, after fully stirring, Ba in the solution 2+ and Ti 4+ The molar ratio is 1.2:1. Add 11.25ml of 5M NaOH solution to the mixed precursor solution to adjust the pH value of the solution, then add 6.35ml oleic acid (OLA) under magnetic stirring, and transfer the above solution to a 100ml autoclave lining after stirring for 10min. At this time, 2.10 ml of tert-butylamine was added to the lining, and the sealed autoclave was placed at 220° C. for 24 hours, and then cooled to room temperature naturally. The precipitate was washed with dilute hydrochloric acid, then washed several times with deionized water and absolute ethanol, filtered, and dried at 60°C in air to obtain barium titanate nanoparticles.

[0027] The XRD pattern of the product is as figure 1 As shown in , all the diffractio...

Embodiment 3

[0029] Weigh 0.7887g of Ba(OH)·8H 2 O was dissolved in 50 ml of deionized water, 1.21 ml of di(2-hydroxypropionic acid)diammonium titanium dihydroxide (50 wt % aqueous solution) was added thereto, and fully stirred evenly. Add 11.25ml of 5M NaOH solution to the mixed precursor solution to adjust the pH value of the solution, then add 6.35ml oleic acid (OLA) under magnetic stirring, and transfer the above solution to a 100ml autoclave lining after stirring for 10min. After adding 2.10ml of tert-butylamine into the lining, place the sealed autoclave at 220°C for 24 hours of reaction, and then cool it down to room temperature naturally. The precipitate was washed with dilute hydrochloric acid, then washed several times with deionized water and absolute ethanol, filtered, and dried in air at 60° C. to obtain barium titanate nanoparticles.

[0030] The XRD pattern of the product is as figure 1 As shown in , all the diffraction peaks of the sample correspond well to the diffractio...

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Abstract

The invention discloses a preparation method of monodisperse barium titanate cubic nanometer particles. According to the method, barium hydroxide octahydrate and 2-hydroxypropanoate are respectively used as a barium source and a titanium source; the materials are firstly dissolved into deionized water to form a mixed precursor solution; then, the pH value of the precursor solution is regulated bya 5M sodium hydroxide solution; furthermore, a proper amount of oleic acid and tert-butylamine are used as surfactants and additives; and the monodisperse BaTiO3 cubic nanometer particles are preparedunder the condition of 180 to 220 DEG C. The method has the advantages that the energy consumption is low; the operation is simple and convenient; the BaTiO3 nanometer particles prepared by the method are cubic phases with high purity and good crystallinity through XRD tests; the regular cubic appearance is realized; and the average crystal grain dimension is 20 to 40 nm, so that wide applicationprospects are realized in the fields of scientific research and electronic industry.

Description

technical field [0001] The invention belongs to the preparation of inorganic functional nanometer materials, in particular to a preparation method of monodisperse barium titanate cubic nanoparticles. Background technique [0002] Barium titanate (BaTiO 3 ) is a metal oxide with a perovskite structure, due to its excellent ferroelectric, piezoelectric, dielectric, and optoelectronic properties, it is widely used in multilayer ceramic capacitors (MLCCs), organic field effect transistors, thermistors, pressure sensors There are huge application prospects in various electronic devices. [0003] The structure and physical properties of barium titanate nanoparticles depend to a large extent on their size, shape and crystallinity. Compared with other structural shapes, the crystal grains with cubic shape tend to form a close-packed structure. The interfaces are closely connected, which is of great significance for the miniaturization of various electronic devices, the research an...

Claims

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Application Information

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IPC IPC(8): C01G23/00B82Y40/00
CPCB82Y40/00C01G23/006C01P2002/30C01P2002/72C01P2004/04C01P2004/64
Inventor 胡万彪李光辉谢继阳熊飞
Owner YUNNAN UNIV
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