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Tetragonal-phase barium titanate nanorod array and preparation method thereof

A technology of nanorod array and phase barium titanate, which is applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., to achieve the effect of high repeatability and simple operation steps

Inactive Publication Date: 2011-05-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the defect that there is no barium titanate nanorod array with tetragonal phase in the prior art and that the crystal structure of barium titanate material can be transformed from cubic phase to tetragonal phase only through high-temperature calcination treatment, one of the purposes of the present invention is to provide A tetragonal phase barium titanate nanorod array, the barium titanate nanorod array is neatly arranged, wherein a single barium titanate nanorod presents a single crystal structure, has a length of 200nm to 10μm, and a diameter of 50nm to 250nm. tetragonal phase

Method used

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  • Tetragonal-phase barium titanate nanorod array and preparation method thereof

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Effect test

Embodiment 1

[0030] Step 1, preparation of titanium dioxide nanorod arrays with rutile structure:

[0031] At room temperature, add deionized water, concentrated hydrochloric acid and tetrabutyl titanate to the polytetrafluoroethylene lining of the hydrothermal kettle according to the volume ratio of 30:30:1, and mix well to prepare a titanium ion solution , the clean fluorine-doped tin dioxide conductive glass is completely immersed in the titanium ion solution, and then the polytetrafluoroethylene lining is placed in a hydrothermal kettle for sealing; the hydrothermal kettle is placed in an oven and heated to 150°C, heat preservation for 6h, take out the hydrothermal kettle, cool naturally, and obtain a titanium dioxide nanorod array with a rutile structure on the fluorine-doped tin dioxide conductive glass;

[0032] Step 2, preparation of tetragonal barium titanate nanorod arrays:

[0033]The fluorine-doped tin dioxide conductive glass grown in the titanium dioxide nanorod array with t...

Embodiment 2

[0036] Step 1, preparation of titanium dioxide nanorod arrays with rutile structure:

[0037] At room temperature, add deionized water, concentrated hydrochloric acid and titanium tetrachloride respectively in the polytetrafluoroethylene lining of the hydrothermal kettle according to the volume ratio of 30:30:0.5, and mix well to prepare a titanium ion solution. The clean fluorine-doped tin dioxide conductive glass is completely immersed in the titanium ion solution, and then the polytetrafluoroethylene lining is placed in a hydrothermal kettle for sealing; the hydrothermal kettle is placed in an oven, and the temperature is raised to 180 ℃, keep warm for 2h, take out the hydrothermal kettle, cool naturally, and obtain a titanium dioxide nanorod array with a rutile structure on the fluorine-doped tin dioxide conductive glass;

[0038] Step 2, preparation of tetragonal barium titanate nanorod arrays:

[0039] The fluorine-doped tin dioxide conductive glass grown in the titaniu...

Embodiment 3

[0042] Step 1, preparation of titanium dioxide nanorod arrays with rutile structure:

[0043] At room temperature, add deionized water, concentrated hydrochloric acid and titanium isopropoxide respectively in the polytetrafluoroethylene lining of the hydrothermal kettle according to the volume ratio of 20:40:1, and mix them uniformly to prepare a titanium ion solution. The clean fluorine-doped tin dioxide conductive glass is completely immersed in the titanium ion solution, and then the polytetrafluoroethylene lining is placed in a hydrothermal kettle for sealing; the hydrothermal kettle is placed in an oven, and the temperature is raised to 200 ℃, keep warm for 1h, take out the hydrothermal kettle, cool naturally, and obtain a titanium dioxide nanorod array with a rutile structure on the fluorine-doped tin dioxide conductive glass;

[0044] Step 2, preparation of tetragonal barium titanate nanorod arrays:

[0045] The fluorine-doped tin dioxide conductive glass grown in the ...

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Abstract

The invention relates to a tetragonal-phase barium titanate nanorod array and a preparation method thereof. In order to overcome the defects that no tetragonal-phase barium titanate nanorod arrays exist in the prior art and the crystal structure of barium titanate material can be changed into a tetragonal phase from a cubic phase only by high-temperature calcining, the invention provides a tetragonal-phase barium titanate nanorod array. The single nanorod has single crystal structure, the length of the single nanorod is 200nm-10mum, and the diameter is 50-250nm. The invention also provides a method for preparing the tetragonal-phase barium titanate nanorod array, comprising: growing a titanium dioxide nanorod array is grown on fluorin-doped stannic oxide conductive glass by hydrothermal reaction; and carrying out secondary hydrothermal reaction to convert the titanium dioxide nanorod array into the barium titanate nanorod array in the invention. The method has the advantages of simple step and high repeatability and can be used for regulating and controlling the diameter and length of the barium titanate nanorod by regulating concentration, temperature and time.

Description

technical field [0001] The invention relates to a tetragonal barium titanate nanorod array and a preparation method thereof, in particular to a barium titanate nanorod array having a tetragonal phase crystal structure and ferroelectricity at room temperature, the titanate The preparation method of the barium nanorod array is a two-step hydrothermal reaction method, which belongs to the technical field of functional material preparation. Background technique [0002] Ferroelectrics are crystals that can be spontaneously polarized within a certain temperature range, and the direction of the spontaneous polarization can be reversibly switched with an external electric field, so it has great potential application value in the fields of non-volatile memory and transistor devices. At the same time, since ferroelectric itself has other properties, such as piezoelectricity, pyroelectricity and high dielectric constant, it is often used to construct transducers, sensitive components ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00B82Y40/00B82Y30/00
Inventor 曹传宝姚锐敏
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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