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Method for coating surface of black phosphor nano particles with mesoporous silica

A technology of mesoporous silica and nanoparticles, which is applied in the field of biomedicine and nanomaterials, can solve the problems of affecting performance, easy aggregation and instability of black phosphorus, etc., achieve low cost, alleviate easy agglomeration characteristics, and enhance photoacoustic signal intensity Effect

Inactive Publication Date: 2017-08-15
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that black phosphorus is easily agglomerated and unstable, which affects its own performance, the present invention provides a method for wrapping mesoporous silicon dioxide on the surface of black phosphorus, which effectively prevents the agglomeration of black phosphorus

Method used

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  • Method for coating surface of black phosphor nano particles with mesoporous silica
  • Method for coating surface of black phosphor nano particles with mesoporous silica
  • Method for coating surface of black phosphor nano particles with mesoporous silica

Examples

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Embodiment 1

[0031] A preparation method for coating mesoporous silica on the surface of black phosphorus nanoparticles, comprising the following steps:

[0032] Weigh 0.2g of black phosphorus powder with a precision electronic scale, suspend it in 25mL of ultrapure water, and shake well. The dispersion was subjected to ice-bath probe ultrasonication for 60 minutes in a probe ultrasonic machine with a power of 300w. In order to prevent excessive heat generation, the mode of the ultrasonic machine was adjusted to ultrasonic for 5 seconds, and then stopped for 2 seconds, and so on for 60 minutes. Change the ice cubes every half hour. After the probe sonication, the dispersion was ultrasonicated in an ice-water bath for 9 hours. The power of the water-bath ultrasonic machine was 300w. In order to prevent excessive heat generation, the ice was changed every 0.5 hours. After the ultrasonication in the water bath, centrifuge with a centrifuge for 2 hours at a speed of 7000 rpm, and set the temp...

Embodiment 2

[0036]The product obtained in Example 1 was subjected to fluorescence lifetime imaging, and the instrument model used was FV1200 / PicoquantFLIM / FCS. A 637nm laser source was used to excite the black phosphorus nanoparticles centrifuged under the condition of centrifuge parameters of 5000rpm*40min, and the measured average fluorescence lifetime was 0.788ns. Using a 637nm laser source to excite black phosphorus nanoparticles coated with mesoporous silica and centrifuge them at 5000rpm*40min, the measured average fluorescence lifetime is 0.289ns, that is to say, they are wrapped with mesoporous silica. The average fluorescence lifetime of silicon oxide black phosphorus nanoparticles is 3.67 times longer than that of uncoated black phosphorus nanoparticles. The black phosphorus nanoparticles used in the fluorescence lifetime imaging in Example 2 and the black phosphorus nanoparticles wrapped with mesoporous silica were all prepared and left for one month before imaging. It can be s...

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Abstract

The invention relates to a method for coating surface of black phosphor nano particles with mesoporous silica, which belongs to the fields of biomedicine and a nano material. preparing the black phosphor nano particles; placing the prepared black phosphor nano particles in a shaking table, oscillating the shaking table while adding a proper amount of TEOS (ethyl orthosilicate), repeating the above step after half hour; after a reaction is completed, performing centrifugation cleaning, discharging a supernatant, and re-dispersing the black phosphor nano particles coated with silica in ultra pure water, the black phosphor nano particles coated with silica can effectively alleviate the easy agglomeration characteristic of black phosphor, and the silica for coating the black phosphor nano particles is used for acoustic imaging, drug loading, and biological imaging.

Description

technical field [0001] The invention relates to the fields of biomedicine and nanometer materials, in particular to a method for wrapping the surface of black phosphorus nanoparticles with mesoporous silicon dioxide. Background technique [0002] Black phosphorus is a new type of two-dimensional material, which has attracted much attention because its shape and properties are very close to that of graphene, and even some properties are better than graphene. In black phosphorus crystals, phonons, photons and electrons all exhibit high anisotropy, which makes black phosphorus have great application potential in the field of thin film electronics and optoelectronics industry. The application of black phosphorus is not limited to the field of optoelectronics. Because phosphorus is one of the necessary elements to form the human body, it plays an important role in the construction of DNA and RNA. There is about 0.7kg of phosphorus in the body of an adult with a normal weight, so ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/00A61K41/00A61K49/22A61K47/04B82Y30/00
CPCA61K41/0052A61K47/02A61K49/225C01B25/003C01P2004/04C01P2004/62C01P2004/64C01P2004/80
Inventor 王秀红孟小童
Owner BEIJING UNIV OF TECH
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