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Perovskite structure lead titanate single crystal nano-sheet preparation method

A perovskite structure, single crystal nanotechnology, applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve the problem of small structural anisotropy, difficult to achieve two-dimensional nanostructure preparation, and difficult to achieve oriented growth and other issues, to achieve the effect of easy large-scale production, low cost and easy control

Inactive Publication Date: 2013-09-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Perovskite structure oxides with ferroelectric properties are generally tetragonal or rhombohedral. Due to the small structural anisotropy, it is difficult to achieve oriented growth, so it is not easy to realize the preparation of two-dimensional nanostructures.

Method used

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  • Perovskite structure lead titanate single crystal nano-sheet preparation method
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  • Perovskite structure lead titanate single crystal nano-sheet preparation method

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Experimental program
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Embodiment 1

[0021] 1) Dissolve 6mmol of tetrabutyl titanate in 60ml of absolute ethanol, then drop it into deionized water to precipitate titanium hydroxide, and wash it with deionized water;

[0022] 2) Add the precipitated titanium oxyhydroxide prepared in step 1) to a potassium hydroxide solution with a concentration of 8 mol / L to obtain a suspension;

[0023] 3) Stir the suspension prepared in step 2) for 30 minutes, then transfer it to a hydrothermal reaction kettle, adjust it with deionized water so that its volume accounts for 4 / 5 of the reaction kettle volume, seal it, and perform a hydrothermal reaction at 200°C for 16 hours , cooled in air, lowered to room temperature, took out the reaction product, filtered, washed with deionized water and absolute ethanol in turn, and dried at 80°C to obtain K 2 Ti 6 o 13 nanowire powder;

[0024] K 2 Ti 6 o 13 See the XRD pattern of figure 1 , its diffraction peak can basically be calibrated as the K of the monoclinic phase 2 Ti 6 o ...

Embodiment 2

[0030] 1) Dissolve 3mmol of tetrabutyl titanate in 60ml of absolute ethanol, then drop it into deionized water to precipitate titanium hydroxide, and wash it with deionized water;

[0031] 2) Add the precipitated titanium oxyhydroxide prepared in step 1) into a potassium hydroxide solution with a concentration of 4 mol / L to obtain a suspension;

[0032] 3) After stirring the suspension prepared in step 2) for 2 hours, transfer it to a hydrothermal reaction kettle, adjust it with deionized water to make the volume account for 2 / 3 of the reaction kettle volume, seal it, and after 32 hours of hydrothermal reaction at 200°C, Cool in air, drop to room temperature, take out the reaction product, filter, wash with deionized water and absolute ethanol in turn, and dry at 80°C to obtain K 2 Ti 6 o 13 nanowire powder;

[0033] 4) Under stirring, dissolve lead nitrate in deionized water, Pb 2+ The ion concentration is adjusted to 0.189mol / L;

[0034] 5) Under stirring, the K obtaine...

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Abstract

The invention relates to a perovskite structure lead titanate single crystal nano-sheet preparation method, which is mainly characterized by comprising: adopting a two-step hydrothermal method, adopting tetrabutyl titanate as a precursor to dissolve in anhydrous ethanol, adding deionized water in a dropwise manner to prepare titanium oxyhydroxide precipitate, washing, mixing with KOH, carrying out a hydrothermal treatment to prepare K2Ti6O13 nano-wire powder, adopting the K2Ti6O13 nano-wire powder as a titanium source, adopting lead nitrate as a lead source, adopting high concentration KOH as a mineralizer, and carrying out a secondary hydrothermal treatment to obtain tetragonal phase perovskite lead titanate single crystal nano-sheet with a thickness of 5-50 nm. The preparation method has characteristics of simple process, easy control, no pollution, low cost, and easy large-scale production achievement.

Description

technical field [0001] The invention relates to a method for preparing a perovskite structure lead titanate single crystal nanosheet structure, belonging to the technical field of inorganic non-metallic materials. Background technique [0002] Compared with its corresponding bulk materials, nanomaterials exhibit many specific properties, and the progress of science and technology and the miniaturization of electronic devices have also put forward more and more requirements for the nanometerization of materials. Therefore, the synthesis and performance research of nanostructured materials have aroused more and more interest and attention. [0003] Lead titanate is a typical ferroelectric material with perovskite structure, and the Curie temperature of its ferroelectric phase transition is 490 o c. Due to its excellent ferroelectric, piezoelectric, and dielectric properties, lead titanate is widely used in the preparation of microelectronic devices such as non-volatile ferro...

Claims

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Application Information

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IPC IPC(8): C30B29/32C30B7/10
Inventor 徐刚邓世琪黄晓强李峰任召辉沈鸽韩高荣
Owner ZHEJIANG UNIV
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