Method for preparing strontium titanate film having spherical grain accumulated porous structure

A spherical particle, porous structure technology, applied in solid-state chemical plating, coating, metal material coating process, etc., can solve problems such as thermal stability, poor uniformity of pore distribution, poor interconnectivity of pores, and difficulty in synthesizing template agents. , to achieve the effects of uniform pore distribution, low synthesis temperature, and improved effective utilization.

Inactive Publication Date: 2012-03-28
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the existing hard template / sol-gel method prepares ordered porous films, there are disadvantages such as difficult template synthesis, complex removal process, high cost, and poor interpenetration between channels, while the traditional soft template / sol-gel method When preparing porous films, there are disadvantages such as thermal stability, poor uniformity of pore distribution, and easy collapse of pore structure, which affects the degree of order and the effective use area of ​​the film.

Method used

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  • Method for preparing strontium titanate film having spherical grain accumulated porous structure
  • Method for preparing strontium titanate film having spherical grain accumulated porous structure
  • Method for preparing strontium titanate film having spherical grain accumulated porous structure

Examples

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Effect test

Embodiment 1

[0024] Add 62ml of absolute ethanol, 17.02g of tetrabutyl titanate, and 7.905g of diethanolamine to a 250ml beaker, stir continuously at a water bath temperature of 30°C, and then stand still for 30min to fully complex; under the condition of constant stirring at a speed of 500rpm Next, 27ml of strontium acetate aqueous solution (Sr(CH 3 COO) 2 .0.5H 2 O, 397.6g / L) was added dropwise to the tetrabutyl titanate ethanol solution at a rate of 0.25ml / min. After the titration was completed for 30 minutes, 1.0g of polyethylene glycol PEG2000 was added and continued to stir until the concentration was 0.4mol / L’s uniform and stable transparent strontium titanate sol; the strontium titanate sol was aged at room temperature for 4 hours and then coated by dipping and pulling method. The ceramic substrate with a clean surface was vertically immersed in titanic acid at a constant speed of 6cm / min In the strontium sol, stand still for 20s, then pull the substrate vertically and uniformly...

Embodiment 2

[0027] Add 94ml of absolute ethanol, 17.02g of tetrabutyl titanate, and 10.54g of diethanolamine into a 250ml beaker, stir evenly at a water bath temperature of 35°C, and then stand still for 30 minutes to fully complex; under the condition of constant stirring at a speed of 600rpm Next, 36.4ml strontium acetate aqueous solution (Sr(CH 3 COO) 2 .0.5H 2 O, 294.9g / L) was added dropwise to the tetrabutyl titanate ethanol solution at a rate of 0.5ml / min. After the titration was completed for 50 minutes, 2.0g of polyethylene glycol PEG2000 was added, and the stirring was continued until a concentration of 0.3mol / The uniform, stable and transparent strontium titanate sol of L; the strontium titanate sol was aged at room temperature for 8 hours and then coated by the dipping and pulling method, and the glass substrate with a clean surface was vertically immersed in the titanium In strontium titanate sol, stand still for 20s, then pull up the substrate vertically and uniformly at a...

Embodiment 3

[0030] Add 176ml of absolute ethanol, 17.02g of tetrabutyl titanate, and 15.81g of diethanolamine into a 500ml beaker, stir continuously at a water bath temperature of 35°C, and then stand still for 30 minutes to fully complex; under the condition of constant stirring at a speed of 800rpm Next, 41ml strontium acetate aqueous solution (Sr(CH 3 COO) 2 .0.5H 2 O, 268.4g / L) was added dropwise to the tetrabutyl titanate ethanol solution at a rate of 1ml / min, and 1 hour after the titration was completed, 3.0g of polyethylene glycol PEG2000 was added, and the stirring was continued until a concentration of 0.2mol / L was obtained. The uniform, stable and transparent strontium titanate sol; the strontium titanate sol was aged at room temperature for 10 hours and then coated by the dipping and pulling method. The silicon wafer with a clean surface was vertically immersed in the strontium titanate at a constant speed of 6cm / min. In the sol, stand still for 20s, then pull the substrate v...

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Abstract

The invention belongs to the technical field of a functional material and particularly relates to a method for preparing a strontium titanate film having a spherical grain accumulated porous structure. A sol gel template process is adopted in the method. The method comprises the following steps: dropwise adding a strontium acetate solution having a certain concentration in a tetrabutyl titanate alcohol solution at a speed of (0.25-2) milliliters per minute; continuously stirring at a speed of (500-1000) revolutions per minute; after finishing titration for 0.5-1.5 hours, adding a non-ionic surface active agent; stirring again till obtaining a uniform, stable, layering-free and 0.1-0.5mol / L strontium titanate sol; after ageing, utilizing a spinning method or dipping drawing method to coat a film on a substrate; and drying and calcinating, thereby obtaining the strontium titanate film having the spherical grain accumulated porous structure. The method provided by the invention has the characteristics of simple production process, less equipment investment, low cost, easiness for operation and excellent repeatability. According to the method, a spherical grain accumulated three-dimensional porous film, which has the characteristics of big specific surface area, uniform pore distribution and excellent interpenetration, can be obtained.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a method for preparing a strontium titanate thin film with a spherical particle stacked porous structure. Background technique [0002] SrTiO 3 The perovskite structure composite metal oxide has the characteristics of metal-like conductive mechanism and variable valence oxide, and has good oxidation catalytic properties. As a gas-sensing material, especially an oxygen-sensing material, it also has the characteristics of good high temperature stability. In the gas sensor, the information can be quickly and accurately obtained and sent out in the form of electrical signals to detect and monitor hazardous gases in real time. The gas sensing mechanism is that when the gas molecules to be tested are adsorbed on the surface or inside of the material, it will cause changes in surface charge, surface energy band, surface adsorbed oxygen, and grain boundary barri...

Claims

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Application Information

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IPC IPC(8): C03C17/22C04B41/85C04B41/50C23C20/08
Inventor 李明春吴玉胜韩亚苓邵义
Owner SHENYANG POLYTECHNIC UNIV
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