Preparation method of lead titanate-strontium titanate monocrystal nanometer material with core-shell structure

A core-shell structure and single-crystal nanotechnology, which is applied in the field of preparation of perovskite-phase lead titanate-strontium titanate single-crystal nanomaterials, can solve problems such as difficult, difficult to control material quality, high cost, etc. Simple process, low cost, easy to control effect

Active Publication Date: 2015-11-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the preparation and growth of most perovskite oxide nanocomposite structures currently use strontium titanate as the substrate, and another oxide grows on the surface, so that the type of the final composite structure and the quality of the interface It has great limitations, and it is difficult to make a breakthrough; and the cost of material preparation methods such as pulsed laser deposition and molecular beam epitaxy growth is high, and the quality of the prepared materials is difficult to control. Therefore, so far, there is no simple method to Fabrication of high-quality nanocomposite structures of strontium titanate grown on a perovskite-phase lead titanate substrate
So far, there are no reports or patents on the regulation and growth of perovskite phase strontium titanate nanocomposite structures by perovskite structure lead titanate single crystal nanosheets

Method used

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  • Preparation method of lead titanate-strontium titanate monocrystal nanometer material with core-shell structure
  • Preparation method of lead titanate-strontium titanate monocrystal nanometer material with core-shell structure
  • Preparation method of lead titanate-strontium titanate monocrystal nanometer material with core-shell structure

Examples

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example 1

[0025] 1) Under magnetic stirring conditions, dissolve NaOH in deionized water to prepare a 2mol / L NaOH aqueous solution;

[0026] 2) According to the chemical formula SrTiO of the perovskite structure strontium titanate to be synthesized 3 Metering ratio, weigh strontium nitrate solid powder and prepare it in deionized water to make Sr 2+ A solution with an ion concentration of 0.02mol / L, and measure tetrabutyl titanate under the condition that the molar ratio of tetrabutyl titanate and strontium nitrate is 1:1;

[0027] 3) Under magnetic stirring conditions, 20 mL of the aqueous strontium nitrate solution prepared in step 2) was added dropwise to 10 mL of the NaOH aqueous solution in step 1) to obtain a mixed solution;

[0028] 4) Under the condition of magnetic stirring, according to the molar ratio of lead titanate to strontium titanate is 1:1, weigh the perovskite phase single crystal single domain lead titanate nanosheets, and add them to the mixed solution in step 3), ...

example 2

[0032] 1) Under magnetic stirring conditions, NaOH was dissolved in deionized water to prepare a 6mol / L NaOH aqueous solution;

[0033] 2) According to the chemical formula SrTiO of the perovskite structure strontium titanate to be synthesized 3 Metering ratio, weigh strontium nitrate solid powder and prepare it in deionized water to make Sr 2+ A solution with an ion concentration of 0.02mol / L, and measure tetrabutyl titanate under the condition that the molar ratio of tetrabutyl titanate and strontium nitrate is 1:1;

[0034] 3) Under magnetic stirring conditions, 30 mL of the aqueous strontium nitrate solution prepared in step 2) was added dropwise to 5 mL of the NaOH aqueous solution in step 1) to obtain a mixed solution;

[0035] 4) Under the condition of magnetic stirring, according to the molar ratio of lead titanate to strontium titanate is 1:1, weigh the perovskite phase single crystal single domain lead titanate nanosheets, and add them to the mixed solution in step ...

example 3

[0039] 1) Under magnetic stirring conditions, NaOH was dissolved in deionized water to prepare a 4mol / L NaOH aqueous solution;

[0040] 2) According to the chemical formula SrTiO of the perovskite structure strontium titanate to be synthesized 3 Metering ratio, weigh strontium nitrate solid powder and prepare it in deionized water to make Sr 2+ A solution with an ion concentration of 0.02mol / L, and measure tetrabutyl titanate under the condition that the molar ratio of tetrabutyl titanate and strontium nitrate is 1:1;

[0041] 3) Under magnetic stirring conditions, 10 mL of the aqueous strontium nitrate solution prepared in step 2) was added dropwise to 25 mL of the NaOH aqueous solution in step 1) to obtain a mixed solution;

[0042] 4) Under the condition of magnetic stirring, according to the molar ratio of lead titanate to strontium titanate is 1:0.8, weigh the perovskite phase single crystal single domain lead titanate nanosheets, and add them to the mixed solution in st...

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Abstract

The invention relates to a preparation method of a perovskite phase lead titanate-strontium titanate monocrystal nanometer material with a core-shell structure. The preparation method comprises the steps of taking a monocrystal single-domain perovskite phase lead titanate nanosheet as a template and a raw material, taking tetrabutyl titanate as a titanium source, taking strontium nitrate as a strontium source, taking sodium hydroxide as a precipitant and a mineralizing agent, and preparing precursor mixed turbid liquid for a hydrothermal reaction under the condition of magnetic stirring; sealing the precursor mixed turbid liquid into a stainless steel reaction still having a teflon liner, and obtaining a core-shell structure perovskite phase lead titanate-strontium titanate monocrystal nanometer composite structure through subjecting to hydro-thermal treatment at the temperature of 160 to 220 DEG C for 4 to 24 hours. The preparation method provided by the invention is simple in technical process, easy to control, free of pollution, low in cost, and easy for mass production. The prepared perovskite phase lead titanate-strontium titanate monocrystal nanometer composite structure has a clear core-shell structure, and has an interface with atomic resolution.

Description

technical field [0001] The invention relates to a preparation method of a perovskite phase lead titanate-strontium titanate single crystal nano material with a core-shell structure, belonging to the field of nano functional materials. Background technique [0002] Perovskite ferroelectric oxides are widely used in the fields of high-density information storage, biomedicine and aerospace due to their rich physical and chemical properties and interesting ferroelectric surface chemical effects and interface effects brought about by intrinsic polarization shielding. Applications. With the gradual advancement of science and technology and the increasing requirements of modern society for the miniaturization and functional integration of electronic devices, the interface design and performance research of perovskite ferroelectric oxides have attracted more and more attention and attention from researchers. Pay attention to. [0003] Lead titanate is a typical ferroelectric mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/10C30B29/32B82Y40/00
Inventor 任召辉尹思敏韩高荣田鹤沈鸽
Owner ZHEJIANG UNIV
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