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Sheet-like strontium titanate nanometer single crystal preparation method

A strontium titanate and single crystal technology is applied in the field of preparation of sheet-like strontium titanate nano-single crystals, which can solve the problems of high equipment requirements, long preparation process, incomplete reaction, etc., and achieves overcoming high process complexity, large surface area and purity. , the effect of uniform particle size

Active Publication Date: 2019-09-06
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this invention are: (1) the preparation process is relatively long, and the sintering property of the sample is relatively poor; (2) the attapulgite-loaded nano-strontium titanate composite material has been prepared, but no pure strontium titanate nano-powder has been prepared.
But the deficiency of this invention is: (1) the use of three-neck flask, condensing tube, constant pressure dropping funnel, the requirement of oil bath heating and magnetic stirring increases the complexity and danger of the preparation process, which is not suitable for industrialized large-scale production requirements; (2) The prepared strontium titanate SrTiO 3 The molar ratios of titanium and strontium in nanopowders are 0.85, 0.93, 0.98, 1.03, and 1.12, respectively, which cannot reach the level of strontium titanate SrTiO 3 The requirement of 1:1 molar ratio of titanium and strontium in the chemical molecular formula
The weak point of this method is: (1) preparation process is difficult to control, and reaction is incomplete; (2) reaction temperature requires hydrothermal reaction more than 150 ℃, and requires stirring, and reaction time requires more than 8h, has increased preparation process. Complexity and danger; (3) The hydrothermal reaction requires a reactor, which requires relatively high equipment and cannot meet the production requirements of industrialization; (4) The strontium titanate powder of about 60nm is prepared, but it cannot meet the requirements of less than 40nm Practical demand for nano strontium titanate nano single crystal

Method used

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  • Sheet-like strontium titanate nanometer single crystal preparation method
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  • Sheet-like strontium titanate nanometer single crystal preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: Preparation of flaky strontium titanate nano single crystals with a particle diameter of 15 nm.

[0051] Step 1, using butyl titanate and absolute ethanol to prepare a 0.109mol / L butyl titanate solution;

[0052] (1a) 50mL absolute ethanol is packed into a beaker;

[0053] (1b) With a needle tube, the density is 0.966g / cm 3 , a liquid butyl titanate with a volume of 1.92 mL;

[0054] (1c) Inject the butyl titanate extracted by the needle into 50 mL of absolute ethanol, and at the same time, mix and stir with an electric mechanical stirrer at a speed of 40 rpm for 3 minutes to obtain a butyl titanate solution with a concentration of 0.109 mol / L.

[0055] Step 2, using strontium nitrate and deionized water to prepare a strontium nitrate solution with a concentration of 0.032mol / L.

[0056] (2a) Dissolving 3.39 g of strontium nitrate into 500 mL of deionized water and mixing to prepare a strontium nitrate aqueous solution with a concentration of 0.032 mol / L; ...

Embodiment 2

[0081] Example 2: Preparation of flaky strontium titanate nano single crystals with a particle diameter of 20 nm.

[0082]Step A, using butyl titanate and absolute ethanol to prepare a 0.347mol / L butyl titanate solution;

[0083] First put 50mL of absolute ethanol into a beaker; then, use a needle to extract 3 , liquid butyl titanate with a volume of 6.112mL; after that, inject the butyl titanate extracted by the needle into 50mL of absolute ethanol, and at the same time mix and stir with an electric mechanical stirrer at a speed of 40 rpm for 3 minutes to obtain The concentration is 0.347mol / L butyl titanate solution.

[0084] Step B, using strontium nitrate and deionized water to prepare a strontium nitrate solution with a concentration of 0.175mol / L.

[0085] First, dissolve 18.52g of strontium nitrate into 500mL of deionized water and mix to prepare a strontium nitrate aqueous solution with a concentration of 0.175mol / L; then, place the funnel on the instrument support, ...

Embodiment 3

[0104] Example 3: Preparation of flaky strontium titanate nano single crystals with a particle diameter of 30 nm.

[0105] Step 1, using butyl titanate and absolute ethanol to prepare a 0.689mol / L butyl titanate solution;

[0106] (1.1) Put 50mL absolute ethanol into a beaker;

[0107] (1.2) Use a needle to extract a density of 0.966g / cm 3 , a liquid butyl titanate with a volume of 12.14 mL;

[0108] (1.3) Inject the butyl titanate extracted by the needle into 50 mL of absolute ethanol, and at the same time, mix and stir with an electric mechanical stirrer at a speed of 40 rpm for 3 minutes to obtain a butyl titanate solution with a concentration of 0.689 mol / L.

[0109] Step 2, use strontium nitrate and deionized water to prepare a strontium nitrate solution with a concentration of 0.425mol / L.

[0110] (2.1) Dissolve 44.97g of strontium nitrate into 500mL of deionized water and mix to prepare a strontium nitrate solution with a concentration of 0.425mol / L;

[0111] (2.2) ...

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Abstract

The invention discloses a sheet-like strontium titanate nanometer single crystal preparation method. In the prior art, the traditional strontium titanate preparation method is complicated, and the purity and the particle size of the strontium titanate powder are difficult to meet the requirements. A purpose of the present invention is mainly to solve the problem in the prior art. The technical scheme comprises: adding an anionic surfactant polyacrylamide aqueous solution or a cationic surfactant cetyltrimethylammonium chloride aqueous solution to a prepared strontium-titanium mixed solution toobtain a surfactant-modified strontium-titanium mixed solution; adding a prepared sodium hydroxide solution to obtain an amphoteric surfactant-modified alkaline strontium-titanium nanometer precipitate; and sequentially carrying out washing, filtering, drying, grinding, drying and sintering on the nanometer precipitate to obtain the sheet-like strontium titanate nanometer single crystal. According to the present invention, the requirements on the operation are simple, the method is suitable for industrial production, and the sample has characteristics of small particles, good dispersibility and no agglomeration, is easily prepared into the strontium titanate grain boundary layer capacitor, and can be widely used in radios, televisions and computer circuits.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, in particular to a preparation method of sheet-like strontium titanate nano single crystal, which can be used for making photocatalysis and various microelectronic heterostructure devices, micro sensors, solar cells, multilayer ceramic capacitors and micro Multifunctional sensor. Background technique [0002] Nanomaterials refer to materials that have at least one dimension in three-dimensional space that is in the size of 1-100nm or constituted by them as basic units, which is approximately equivalent to the scale where 10-100 atoms are closely arranged together. Materials with nanoscale structures often possess unique optical, electronic or mechanical properties. Optical properties of nanoparticles, such as fluorescence, are also a function of particle size. This effect doesn't work from the macroscopic to the micron scale, but becomes very pronounced at the nanoscale. When nanopa...

Claims

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Application Information

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IPC IPC(8): C01G23/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G23/006C01P2004/01C01P2004/20C01P2006/80
Inventor 任庆利杨如森王健陈俊文王珍妮党甲林王媛李智敏
Owner XIDIAN UNIV
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