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Bismuth oxybromide ultra-thin nano sheet photochromic material rich in oxygen vacancies as well as preparation method and application thereof

A photochromic material, bismuth oxybromide technology, applied in the direction of color-changing fluorescent materials, nanotechnology, chemical instruments and methods, can solve the problems of poor dispersion of bismuth oxybromide, increased cost, unfavorable environmental protection, etc., to achieve photochromic effect good, long cycle life, and low synthesis cost

Active Publication Date: 2021-09-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bismuth oxybromide prepared by this method has problems such as poor dispersion and large size.
At the same time, ethylene glycol solution is used in the synthesis process, which increases the cost and is not conducive to environmental protection.

Method used

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  • Bismuth oxybromide ultra-thin nano sheet photochromic material rich in oxygen vacancies as well as preparation method and application thereof
  • Bismuth oxybromide ultra-thin nano sheet photochromic material rich in oxygen vacancies as well as preparation method and application thereof
  • Bismuth oxybromide ultra-thin nano sheet photochromic material rich in oxygen vacancies as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for preparing an oxygen-vacancy-rich bismuth oxybromide ultra-thin nanosheet photochromic material, comprising the following steps:

[0041] (1) Dissolve 0.6g polyvinylpyrrolidone (average molecular weight 30000) and 0.6g mannitol in 30mL water, stir until the solution is transparent, add 0.485g bismuth nitrate pentahydrate, continue stirring until bismuth nitrate pentahydrate is completely dissolved, then add 5mL Aqueous sodium bromide solution with a concentration of 0.2 mol / L was stirred for 30 minutes to obtain a mixed solution.

[0042] (2) The mixed solution in step (1) was transferred to a polytetrafluoroethylene reactor with a volume of 60 mL, reacted at 150° C. for 12 hours, and cooled naturally to room temperature after the reaction was completed.

[0043] (3) Filter the reaction solution obtained in step (2), centrifuge and wash the obtained precipitate three times with a mixed solvent of water and acetone (the volume ratio of water and acetone is 1:...

Embodiment 2

[0052] A method for preparing an oxygen-vacancy-rich bismuth oxybromide ultra-thin nanosheet photochromic material, comprising the following steps:

[0053] (1) Dissolve 0.6g polyvinylpyrrolidone (average molecular weight 130000) and 0.6g mannitol in 30mL water, stir until the solution is transparent, add 0.485g bismuth nitrate pentahydrate, continue stirring until bismuth nitrate pentahydrate is completely dissolved, then add 5mL Aqueous cetyltrimethylammonium bromide solution with a concentration of 0.2 mol / L was stirred for 30 minutes to obtain a mixed solution.

[0054] (2) The mixed solution in step (1) was transferred to a polytetrafluoroethylene reactor with a volume of 60 mL, reacted at 150° C. for 3.5 hours, and cooled naturally to room temperature after the reaction was completed.

[0055] The reaction solution obtained in step (2) was filtered, and the obtained precipitate was centrifuged and washed 3 times with a mixed solvent of water and acetone (the volume ratio...

Embodiment 3

[0057] A method for preparing an oxygen-vacancy-rich bismuth oxybromide ultra-thin nanosheet photochromic material, comprising the following steps:

[0058] (1) Dissolve 1.0g polyvinylpyrrolidone (average molecular weight 30000) and 1.0g mannitol in 30mL water, stir until the solution is transparent, add 0.353g bismuth sulfate, continue stirring until bismuth sulfate is completely dissolved, then add 5mL of 0.2mol / L sodium bromide aqueous solution, after stirring for 30 minutes, a mixed solution was obtained.

[0059] (2) The mixed solution in step (1) was transferred to a polytetrafluoroethylene reactor with a volume of 60 mL, reacted at 150° C. for 12 hours, and cooled naturally to room temperature after the reaction was completed.

[0060] (3) Filter the reaction solution obtained in step (2), centrifuge and wash the obtained precipitate three times with a mixed solvent of water and acetone (the volume ratio of water and acetone is 1:5), and dry at 80°C for 9 hours to obta...

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Abstract

The invention provides a bismuth oxybromide ultra-thin nano sheet photochromic material rich in oxygen vacancies as well as a preparation method and application thereof. The structural formula of the bismuth oxybromide ultra-thin nano sheet photochromic material is BiOBr, the surface of the bismuth oxybromide ultra-thin nano sheet photochromic material is modified with polyvinyl pyrrolidone and mannitol, and the preparation method of the bismuth oxybromide ultra-thin nano sheet photochromic material comprises the following steps: adding a bismuth source, polyvinyl pyrrolidone and mannitol into water, uniformly stirring and mixing, adding an aqueous solution containing a bromine source, carrying out a hydrothermal reaction on the obtained mixed solution, and then washing and drying to obtain the product. The oxygen vacancy-rich bismuth oxybromide ultra-thin nano sheet photochromic material prepared by the invention has the characteristics of small particle size, small thickness, difficulty in agglomeration, good stability, high purity and the like, has the advantages of high mechanical strength, low synthesis cost, no byproduct, no pollution, high thermal stability and chemical stability, suitability for mass production and the like, can be widely applied to the fields of erasable rewriting media, photochromic coatings, silk-screen printing and the like, and has a very high practical value.

Description

technical field [0001] The invention relates to a bismuth oxybromide ultra-thin nanosheet photochromic material rich in oxygen vacancies, a preparation method and application thereof, and belongs to the technical field of intelligent materials. Background technique [0002] Reversible color-switching materials (PCSMs) have gradually attracted attention due to their applications in erasable rewritable paper, smart windows, and anti-counterfeiting, especially the development of photochromic materials with light-reversible color-switching properties has received great attention. focus on. However, organic photochromic materials have problems such as complex synthesis, many by-products, and photodegradation under ultraviolet (UV) irradiation, which are serious obstacles to their practical application. Inorganic photochromic materials are superior to organic photochromic materials in terms of thermal stability, chemical stability and cost, and have been developed in recent years...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00B82Y40/00C09K9/00C09D105/12C09D7/61
CPCC01G29/00B82Y40/00C09K9/00C09D105/12C09D7/61C09D7/70C01P2004/24C01P2004/64C01P2006/60C08K2201/011C08K7/00
Inventor 张晓王文寿王旭张云赵敬梅
Owner SHANDONG UNIV
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