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Large-sized potassium niobate film and preparation method thereof

A potassium niobate, large-scale technology, applied in chemical instruments and methods, niobium compounds, inorganic chemistry, etc., can solve the problems of difficult control, complicated chemical preparation methods, unstable potassium and sodium niobate precursor liquid, etc., and achieves simple operation. , easy to control, mild reaction conditions

Active Publication Date: 2017-06-20
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the precursor solution is a combination of metal ethoxide, the prepared potassium sodium niobate precursor solution is very unstable and easy to hydrolyze, so it is impossible to obtain

Method used

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  • Large-sized potassium niobate film and preparation method thereof
  • Large-sized potassium niobate film and preparation method thereof
  • Large-sized potassium niobate film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Preparation of Potassium Niobate

[0037] Potassium niobate (K 4 Nb 6 o 17 ): potassium carbonate (K 2 CO 3 ) and niobium pentoxide (Nb 2 o 5 ) in a molar ratio of 2.7:3.0, and then reacted at 1150° C. for 10 h, and the product was taken out and sealed for further peeling.

[0038] Such as figure 1 with figure 2 As shown, the high-temperature solid-state reaction of potassium carbonate and niobium pentoxide results in potassium niobate with a large-scale multilayer structure.

[0039] 2. Stripping of potassium niobate

[0040] Get 0.3g potassium niobate (K 4 Nb 6 o 17 ), add 60 mL of deionized water, let stand for 1 h, add 3 mL of propylamine, transfer to 80 mL of polytetrafluoroethylene-lined stainless steel reactor, and heat to 120 ° C for 3 days. After the reaction was completed, it was left to stand for 1 day to prepare for further preparation of the filtrate.

[0041] 3. Preparation of filtrate

[0042]Remove part of the supernatant from the stri...

Embodiment 2

[0047] With reference to the method of Example 1, change the volume of the suction filtrate, get 2mL of potassium niobate suction filtrate (15mg / mL) and other conditions remain unchanged, carry out suction filtration under reduced pressure.

Embodiment 3

[0049] With reference to the method of Example 1, change the volume of the suction filtrate, get 6mL potassium niobate suction filtrate (15mg / mL) and other conditions remain unchanged, carry out suction filtration under reduced pressure.

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Abstract

The invention discloses a large-sized potassium niobate film and a preparation method thereof, belonging to the technical field of two-dimensional nanomaterials. The preparation method comprises the following steps: (1) mixing potassium carbonate with niobium pentoxide in a molar ratio of (0.87-0.95) to 1, carrying out high-temperature solid phase sintering so as to obtain potassium niobate blocks, and reacting with a propylamine water solution, so as to obtain viscous potassium niobate dispersion liquid; and (2) carrying out suction filtration on the viscous potassium niobate dispersion liquid, so as to obtain the large-sized potassium niobate film. According to the preparation method, a peeling reaction is carried out in the propylamine water solution according to a special molecular structure of potassium niobate, a large-sized stratified structure of potassium niobate is maintained, and potassium niobate slices in the dispersion liquid are sequentially deposited by virtue of a reduced pressure suction filtration method, so as to form the continuous and uniform large-sized potassium niobate film. The preparation method of the large-sized potassium niobate film has the beneficial effects that the operation is simple, and the reaction conditions are mild and easy to control.

Description

technical field [0001] The invention relates to the technical field of two-dimensional nanomaterials, in particular to a large-scale potassium niobate thin film and a preparation method thereof. Background technique [0002] Inorganic layered nanomaterials have broad application prospects. They are a new type of nano-functional materials with special structures and properties. They are also the frontiers and hotspots in the field of chemistry and materials research. The transformation of inorganic layered materials into two-dimensional nanosheets has attracted great interest of researchers and has been widely used in lithium electronic batteries, supercapacitors, photocatalysis, optoelectronic devices and other fields. [0003] Potassium niobate (K 4 Nb 6 o 17 ) are regarded as important perovskite materials due to their optoelectronic properties, nonlinear optical properties, piezoelectricity, and photocatalytic properties. At present, potassium niobate is mainly prepar...

Claims

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Application Information

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IPC IPC(8): C01G33/00
CPCC01G33/00C01P2002/72C01P2004/03
Inventor 刘海清李蕾王香卫翟云云
Owner JIAXING UNIV