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Preparation method of BiFeO3 material, BiFeO3/TiO2 composite film and application thereof

A composite film and film layer technology, applied in chemical instruments and methods, iron compounds, chemical/physical processes, etc., can solve the problems of side effects, inconvenient use, etc., achieve improved absorption rate, increase ferroelectric susceptibility, and facilitate large-scale The effect of mass production

Inactive Publication Date: 2014-05-07
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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But UV exposure has certain side effects and is inconvenient to use

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  • Preparation method of BiFeO3 material, BiFeO3/TiO2 composite film and application thereof
  • Preparation method of BiFeO3 material, BiFeO3/TiO2 composite film and application thereof
  • Preparation method of BiFeO3 material, BiFeO3/TiO2 composite film and application thereof

Examples

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preparation example Construction

[0036] TiO of the present invention 2 The preparation method of the material is a conventional preparation method in the art.

[0037] The substrate of the present invention can be selected from substrate materials commonly used in the art, such as glass slides, LaAlO 3 , SrTiO 3 , silicon wafers, etc.

[0038] TiO of the present invention 2 / BFO double-layer film means that the substrate is first coated with TiO 2 thin film, the TiO 2 The film is coated with a bilayer film of BFO film.

[0039] BFO / TiO of the present invention 2 Double-layer film means that the substrate is first coated with a BFO film, and the BFO film is coated with TiO 2 The bilayer film of the film.

Embodiment 1

[0042] This example is about the preparation method of BFO sol.

[0043] (1) 3.0695g bismuth nitrate (Bi(NO 3 ) 3 ) and 2.3511g ferric nitrate (Fe(NO 3 ) 3 ) was dissolved in 20ml of ethylene glycol methyl ether to obtain solution 1, the concentration of which was 0.3mol / l;

[0044] (2) Add complexing agent citric acid to solution 1 to obtain solution 2. The dosage of citric acid is: the molar ratio of citric acid, bismuth ions and iron ions is: 1:1:1;

[0045] (3) Adjust the pH of solution 2 to 4 with acetic acid; obtain BFO sol after aging for 24 hours.

Embodiment 2

[0047] The difference between this embodiment and embodiment 1 is that the concentration of solution one is 0.2 mol / L, and the pH of solution two is 4.

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Abstract

The invention relates to a preparation method of a BiFeO3 material, a BiFeO3 / TiO2 composite film and an application thereof. The preparation method of the BiFeO3 material comprises the steps: firstly, dissolving bismuth nitrate and ferric nitrate into ethylene glycol monomethyl ether to obtain a solution I; then, dissolving citric acid into the solution I to obtain a solution II; and next, regulating the PH value of the solution II to 3-5 by using acetic acid to obtain a BiFeO3 sol. The BiFeO3 / TiO2 composite film comprises a substrate, wherein the substrate is coated with double layers of films which are respectively a BiFeO3 film layer and a TiO2 film layer. The absorptivity of the BiFeO3 / TiO2 composite film on a visible light wave band is greatly improved through the absorption spectrum test and theoretical analysis on the double layers of films. The BiFeO3 / TiO2 composite film is applied to the preparation of photovoltaic materials, solar cells, orientation controlled photoelectric functional device materials and visible light catalysis sterilization materials.

Description

technical field [0001] The invention relates to photoelectric material technology, in particular to BiFeO 3 Thin film preparation method, BiFeO 3 / TiO 2 Composite film and application of the composite film. Background technique [0002] Multiferroic materials (multiferroics) are materials that have two or more of the three primary ferromagnetic properties of (anti)ferromagnetism, (anti)ferroelectricity and (anti)ferroelasticity at the same time. When the two order parameters of (anti)ferromagnetism and (anti)ferromagnetism are coupled with each other, a magnetoelectrically coupled multiferroic material is formed. Combining (anti) ferromagnetic materials and (anti) ferroelectric materials in an orderly manner according to a specific structure can realize composite magnetoelectric coupling materials. Due to the mutual repulsion of magnetism and ferroelectricity, natural single-phase magnetoelectric coupling The material is still relatively rare. [0003] BiFeO 3 (BFO) is...

Claims

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Application Information

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IPC IPC(8): C01G49/00B01J23/843H01L31/0725
CPCY02E10/50
Inventor 冯宏剑段碧王明梓
Owner NORTHWEST UNIV
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