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Preparation method of monodisperse large-size ultrathin two-dimensional strontium niobate nanosheet

A technology of strontium niobate and nanosheets, applied in chemical instruments and methods, niobium compounds, inorganic chemistry, etc., can solve the problems of not meeting the large aspect ratio, non-uniformity, small size of SNO nano-powder, etc., and achieve low cost , the effect of high surface energy and large aspect ratio

Inactive Publication Date: 2022-01-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the SNO nanopowders that have been successfully synthesized are small and uneven in size, and do not meet the requirements of large aspect ratio.

Method used

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  • Preparation method of monodisperse large-size ultrathin two-dimensional strontium niobate nanosheet
  • Preparation method of monodisperse large-size ultrathin two-dimensional strontium niobate nanosheet
  • Preparation method of monodisperse large-size ultrathin two-dimensional strontium niobate nanosheet

Examples

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preparation example Construction

[0027] The preparation method of above-mentioned nanometer material, comprises the following steps:

[0028] 1) Prepare a hydrothermal kettle with a capacity of 30-40% and a concentration of 3.8-4.2mol L -1 The potassium hydroxide solution, adding niobium pentoxide powder, the number of moles is 0.15-0.18 times of the moles of potassium hydroxide. Under the condition of 0-10°C cold water bath, pulse ultrasonic for 4-6h, the ultrasonic frequency is 20-25kHz, and the power is 150-200W. Heat treatment at 170-200°C for 12-24h;

[0029] 2) The clarified solution obtained in the first step is centrifuged to remove trace impurities at a high speed of 10000 r / min for 10 min. Use a syringe pump, slowly add strontium nitrate solution dropwise at 30-50ml / h, and continuously stir vigorously for 8-10h. Reaction 66-78h.

[0030] 3) Soak the obtained SNO powder in hydrochloric acid for 3-5 hours, then centrifuge and wash with absolute ethanol and deionized water for 3-5 times, and finall...

Embodiment 1

[0033] This embodiment is used to prepare soluble niobium salt solution, and the preparation method comprises the following steps:

[0034] 1) Prepare 35ml with a concentration of 4mol L -1 Potassium hydroxide solution was added to a 100ml polytetrafluoroethylene hydrothermal kettle lining.

[0035] 2) Add 0.5 g of niobium pentoxide powder into the potassium hydroxide solution above, and pulse ultrasonic for 5 hours under the condition of a cold water bath at 5° C., the ultrasonic frequency is 25 kHz, and the power is 200 W.

[0036] 3) Then heat-treat the above ultrasonically dispersed suspension at 180°C for 20 hours to obtain a clear soluble niobium salt solution. The soluble niobium salt is K 8 Nb 6 o 19 10H 2 O.

Embodiment 2

[0038] This embodiment is used for monodisperse large-size ultra-thin two-dimensional Sr 2 Nb 2 o 7 Preparation and characterization of (SNO) nanosheets, the preparation method includes:

[0039] 1) The clarified solution obtained in Example 1 was centrifuged at a high speed for 10min at a speed of 10000r / min, and transferred to a 100ml PPL-made hydrothermal kettle lining after removing trace impurities.

[0040] 2) Slowly add 35ml of 0.2mol / L strontium nitrate solution dropwise to the above solution, use a syringe pump during the dropping process, and the injection rate is 40ml / h, white milky matter will be formed during this process, so it needs to be continuously added during the dropping process Stir vigorously and keep stirring for 10 h, at this time the filling volume of the hydrothermal kettle is about 70%.

[0041]3) Seal the above white emulsion in a hydrothermal kettle, heat treatment for 72 hours, the heating process is 3°C / min from room temperature to 200°C, and...

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Abstract

The invention relates to a preparation method of a monodisperse large-size ultrathin two-dimensional strontium niobate nanosheet, which comprises the following steps: adding niobium pentoxide into a potassium hydroxide solution, obtaining a suspension of niobium pentoxide in an ice-water bath environment, controlling the filling volume of a reaction kettle to be 30-40%, conducting reacting for 12-24 hours at the temperature of more than 170 DEG C and less than 200 DEG C to obtain a clear niobium-containing solution; and centrifuging the solution at a high speed to remove trace impurities, slowly dropwise adding a strontium nitrate solution with the same volume as the niobium-containing solution by using an injection pump, continuously and strongly conducting stirring for 8-10 hours, and conducting reacting at 230-250 DEG C for 66-78 hours to obtain the strontium niobate nano material with an ultrathin two-dimensional structure. The thickness of the large-size ultrathin two-dimensional structure strontium niobate nano-material prepared by the method is less than 5 nanometers, the length and width sizes reach 1-4 microns, the preparation process is simple, the cost is low, and meanwhile, the wide application prospect of the large-size ultrathin two-dimensional structure strontium niobate nano-material in the fields of piezoelectric catalysis, organic-inorganic composite energy storage and microwave resonance is provided.

Description

technical field [0001] The invention relates to a high-purity strontium niobate nanomaterial, in particular to a monodisperse large-size ultra-thin two-dimensional Sr 2 Nb 2 o 7 (SNO) nanosheet preparation method. Background technique [0002] SNO with a layered perovskite structure has an ultra-high Curie temperature (greater than 1300 ° C), and its resistivity is 2-3 orders of magnitude higher than that of traditional perovskite and bismuth layered ferroelectric materials, so its It has very good application prospects in the fields of aerospace, nuclear power plants, structural control and health monitoring sensors in the automotive industry. The band gap of SNO is 3.5eV, and the density of states at the conduction band mainly comes from the d orbital of Nb, which determines its photocatalytic activity, and the rotation of niobium-oxygen octahedron makes it have the property of spontaneous polarization. When subjected to mechanical strain, the polarization-induced depo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00
CPCC01G33/00C01P2002/72C01P2004/03C01P2004/04C01P2004/20C01P2006/80
Inventor 沈波白海瑞翟继卫
Owner TONGJI UNIV
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