Barium strontium titanate ferroelectric nano single crystal particle and preparation method thereof

A nano-single crystal, barium strontium titanate technology, applied in the field of nano-materials, can solve the problems of difficult control of size and shape, unreachable ferroelectric nanocrystals, etc., and achieve the effect of easy control of the process, simple equipment and convenient operation

Inactive Publication Date: 2010-05-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the size and shape of the existing preparation method is difficult to control, the obtained ferroelectric nanocrystals have not reached the level of nearly single size and regular shape, and provide a barium strontium titanate ferroelectric Nano single crystal particle, another object of the present invention is to provide the preparation method of above-mentioned strontium barium titanate ferroelectric nano single crystal particle.

Method used

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  • Barium strontium titanate ferroelectric nano single crystal particle and preparation method thereof
  • Barium strontium titanate ferroelectric nano single crystal particle and preparation method thereof
  • Barium strontium titanate ferroelectric nano single crystal particle and preparation method thereof

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Embodiment 1

[0030] Utilize the method provided by the invention, prepare chemical composition to be Ba 0.6Sr 0.4 TiO 3 monodisperse cubic nanocrystals.

[0031] The operation steps are as follows:

[0032] 1) Under the condition of a stirring speed of 200rpm, in an ice-water bath at 1°C, in 80ml of 0°C without CO 2 Add 0.88ml 0°C TiCl dropwise in deionized water 4 , forming colorless and transparent TiOCl 2 Solution; Then dropwise add 3.3ml ammoniacal liquor (26wt%), rate of addition 0.5ml / min, form white amorphous hydrated titanium dioxide gel; Use this gel without CO 2 Wash with deionized water for 5 times, and the pH of the washing solution is 7.0; gel centrifugation is carried out at a speed of 11,000 rpm for 5 minutes;

[0033] 2) According to the stoichiometric requirement of x=0.4, in a water bath with a set temperature of 80°C and N 2 Under atmosphere protection, 2.2714gBa(OH) 2 ·8H 2 O, 1.0158gSr(NO 3 ) 2 Dissolve in 20ml of water to prepare a transparent barium-stront...

Embodiment 2

[0037] Utilize the method provided by the invention, prepare chemical composition to be Ba 0.8 Sr 0.2 TiO 3 monodisperse cubic nanocrystals.

[0038] 1) Under the condition of a stirring speed of 150rpm, in an ice-water bath at 2°C, in 80ml of 0°C without CO 2 Add 0.88ml 0°C TiCl dropwise in deionized water 4 , forming colorless and transparent TiOCl 2 Solution; Then dropwise add 3.3ml ammoniacal liquor (26wt%), rate of addition 0.3ml / min, form white amorphous hydrated titanium dioxide gel; Use this gel without CO 2 Wash with deionized water for 5 times, and the pH of the washing solution is 6.8; gel centrifugation is carried out at a speed of 10,000 rpm for 10 minutes;

[0039] 2) According to the stoichiometric requirement of x=0.2, in a water bath with a set temperature of 80°C and N 2 Under atmosphere protection, 3.0285gBa(OH) 2 ·8H 2 O, 0.5079gSr(NO 3 ) 2 Dissolve in 40ml of water to prepare a transparent barium strontium aqueous solution;

[0040] 3) Under the...

Embodiment 3

[0043] Utilize the method provided by the invention, prepare chemical composition to be BaTiO 3 monodisperse cubic nanocrystals.

[0044] 1) Under the condition of stirring speed of 250rpm, in 80ml 0℃ without CO in 4℃ ice-water bath 2 Add 0.88ml 0°C TiCl dropwise in deionized water 4 , forming colorless and transparent TiOCl 2 solution; then dropwise add 3.3ml ammoniacal liquor (26wt%), rate of addition 0.4ml / min, form white amorphous hydrated titanium dioxide gel; Use this gel without CO 2 Wash with deionized water for 5 times, and the pH of the washing solution is 7.0; gel centrifugation is carried out at a speed of 9000 rpm for 12 minutes;

[0045] 2) According to the stoichiometric requirement of x=0, under the protection of a water bath with a set temperature of 80°C and an argon atmosphere, 3.7856gBa(OH) 2 ·8H 2 O was dissolved in 50ml of water to prepare a transparent barium-strontium aqueous solution;

[0046] 3) Under the protection of nitrogen, use the ultrason...

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Abstract

The invention relates to a barium strontium titanate ferroelectric nano single crystal particle and a preparation method thereof. Pure Sr(NO3)2, Ba(OH)2.8H2O and TiCl4 serve as raw materials, de-ionized water and 1,4-butanediol serve as reaction medium and oleic acid serves as surfactant; at the absence of mineralizer, the nucleation-growth process is controlled by alcohol heat action in an autoclave to synthesize and obtain barium strontium titanate ferroelectric nano single crystal particles. The barium strontium titanate ferroelectric nano single crystal particle prepared by the invention has the characteristics of accurate chemical composition, regular cubic appearance, near single dimension, favourable dispersion stability and the like. The ferroelectric nano single crystal material can be used for self-assembly aiming to the nanometer ordered array structure of super high density ferroelectric memory, and the microstructural characteristics of the invention have not been reported publicly so far.

Description

Technical field: [0001] The invention belongs to the field of nanomaterials, and relates to a barium strontium titanate ferroelectric nano single crystal particle and a preparation method thereof, in particular to a near-single-size cube applied to the self-assembly of a planar nano-ordered array structure for an ultra-high-density ferroelectric memory Barium strontium titanate ferroelectric nano single crystal particle and preparation method thereof. Background technique: [0002] Since the middle of the 20th century, large-scale integrated circuits and storage technologies have developed rapidly at an exponential rate, electronic devices have been continuously miniaturized and miniaturized, and the feature size of transistors on chips is advancing from submicron to nanoscale. Since the traditional planar microelectronics processing technology based on "top down" is used in the processing of nano-devices, it encounters more and more difficulties with the reduction of size. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32
Inventor 曾燕伟杨晓伟
Owner NANJING UNIV OF TECH
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