Preparation method of sheet-like strontium titanate nano single crystal

Abstract

The invention discloses a preparation method of sheet strontium titanate nano single crystal, which mainly solves the problems that the traditional preparation method of strontium titanate is complicated and the purity and particle size of strontium titanate powder are difficult to meet the requirements. The realization plan is: add an anionic surfactant polyacrylamide aqueous solution or a cationic surfactant cetyltrimethylammonium chloride aqueous solution to the prepared strontium titanium mixed solution to obtain a surfactant modified strontium titanium mixed solution. solution; then add the prepared sodium hydroxide solution to it to obtain the amphoteric surfactant-modified alkaline strontium titanium nano-precipitate; then the nano-precipitate is washed, filtered, dried, ground, dried and sintered in sequence , to obtain sheet-like strontium titanate nano single crystals. The invention has simple preparation and operation requirements, is suitable for industrial production, has small sample particles, good dispersibility and no agglomeration, is beneficial to making strontium titanate grain boundary layer capacitors, 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...

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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

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