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A nanoparticle self-assembled tetragonal perovskite phase Pbtio 3 Preparation method of microsheets

A perovskite phase and nanoparticle technology, applied in chemical instruments and methods, solutions from room temperature liquid solvents, single crystal growth, etc., can solve the problems of low orientation and no discovery, and achieve good crystallinity and regular morphology. , the effect of easy mass production

Active Publication Date: 2016-06-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Synthesis of PbTiO by Hydrothermal Method 3 In the process, only irregular products with relatively low orientation can be prepared through the traditional crystal growth route, and no regular product with a certain orientation can be synthesized by self-assembly through particle aggregation.

Method used

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  • A nanoparticle self-assembled tetragonal perovskite phase Pbtio <sub>3</sub> Preparation method of microsheets
  • A nanoparticle self-assembled tetragonal perovskite phase Pbtio <sub>3</sub> Preparation method of microsheets
  • A nanoparticle self-assembled tetragonal perovskite phase Pbtio <sub>3</sub> Preparation method of microsheets

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) The TiO 2 The powder was dissolved in an aqueous solution with a concentration of 15mol / L KOH to adjust the Ti 4+ The concentration is 0.5mol / L, and TiO is obtained 2 alkaline aqueous solution;

[0019] 2) Under stirring, add the TiO prepared in step 1) to the 2 Pb(NO) was added to the alkaline solution 3 ) 2 Powder, regulated Pb 2+ The ion concentration is 0.5mol / L, after stirring for 5min, add anhydrous ethanol solution to the system, the volume of the added anhydrous ethanol is twice the volume of the KOH aqueous solution used in step 1), and continue stirring for 2h to obtain titanium and Lead hydroxide suspension;

[0020] 3) Add the hydroxide suspension of titanium and lead prepared in step 2) into the inner tank of a 50ml polytetrafluoroethylene reactor, and adjust the volume of the reaction material in the inner tank of the reactor with absolute ethanol Reach 80% of the volume of the inner tank of the reactor to obtain the reaction material;

[0021] ...

Embodiment 2

[0023] 1) The TiO 2 The powder was dissolved in an aqueous solution with a concentration of 15mol / L KOH to adjust the Ti 4+ The concentration is 0.5mol / L, and TiO is obtained 2 alkaline aqueous solution;

[0024] 2) Under stirring, add the TiO prepared in step 1) to the 2 Pb(NO) was added to the alkaline solution 3 ) 2 Powder, regulated Pb 2+ The ion concentration is 0.625mol / L, after stirring for 5min, add anhydrous ethanol solution to the system, the volume of the added anhydrous ethanol is 3 times the volume of the KOH aqueous solution used in step 1), and continue stirring for 3h to obtain titanium and Lead hydroxide suspension;

[0025] 3) Add the hydroxide suspension of titanium and lead prepared in step 2) into the inner tank of a 50ml polytetrafluoroethylene reactor, and adjust the volume of the reaction material in the inner tank of the reactor with absolute ethanol Reach 80% of the volume of the inner tank of the reactor to obtain the reaction material;

[00...

Embodiment 3

[0028] 1) The TiO 2 The powder was dissolved in an aqueous solution with a concentration of 15mol / L KOH to adjust the Ti 4+ The concentration is 0.5mol / L, and TiO is obtained 2 alkaline aqueous solution;

[0029] 2) Under stirring, add the TiO prepared in step 1) to the 2 Pb(NO) was added to the alkaline solution 3 ) 2 Powder, regulated Pb 2+ The ion concentration is 0.6 mol / L. After stirring for 5 min, anhydrous ethanol solution is added to the system. The volume of the added anhydrous ethanol is twice the volume of the KOH aqueous solution used in step 1), and stirring is continued for 3 h to obtain titanium and Lead hydroxide suspension;

[0030] 3) Add the hydroxide suspension of titanium and lead prepared in step 2) into the inner tank of a 50ml polytetrafluoroethylene reactor, and adjust the volume of the reaction material in the inner tank of the reactor with absolute ethanol Reach 80% of the volume of the inner tank of the reactor to obtain the reaction material...

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Abstract

Nanoparticle self-assembled tetragonal perovskite phase PbTiO disclosed by the present invention 3 The preparation method of the micron flakes adopts a hydrothermal reaction method, using titanium dioxide, potassium hydroxide, lead nitrate, deionized water and absolute ethanol as reaction materials, at 120 to 200 o The hydrothermal reaction was carried out in the reactor under C to obtain the tetragonal perovskite phase PbTO formed by the self-assembly of nanoparticles 3 micron flakes. The tetragonal perovskite phase PbTO 3 Micron flakes, good crystallinity, high purity, and good dispersibility. The invention has the advantages of simple technological process, regular and stable product appearance, easy control, low cost, no pollution and easy large-scale production.

Description

technical field [0001] The present invention relates to a kind of PbTiO 3 Preparation method of microflakes, especially nanoparticle self-assembled tetragonal perovskite phase PbTiO 3 The invention relates to a preparation method of microchips, belonging to the technical field of inorganic non-metallic materials. technical background [0002] Perovskite Structure PbTiO 3 It is a typical ferroelectric oxide with simple structure and excellent ferroelectric, piezoelectric and dielectric properties. PbTiO 3 Has a high ferroelectric phase transition Curie temperature (490 o C) and high spontaneous polarization, have wide applications in the fabrication of microelectronic devices such as non-volatile ferroelectric memories, piezoelectric sensors, infrared detectors, and high-dielectric capacitors. The advancement of science and technology and the miniaturization of electronic devices have put forward more and more requirements for the micronization or even nanometerization o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/32C30B7/10
Inventor 韩高荣尹思敏任召辉任杰沈鸽
Owner ZHEJIANG UNIV
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