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Au@SiO2 mesoporous composite nanomaterial and preparation method thereof

A composite nanomaterial and mesoporous technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of easy aggregation of nanoparticles, and achieve the effect of uniform distribution and narrow size distribution

Active Publication Date: 2015-12-23
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the former tends to form larger-sized nanoparticles and agglomerate easily during the synthesis of metal nanoparticles.

Method used

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  • Au@SiO2 mesoporous composite nanomaterial and preparation method thereof
  • Au@SiO2 mesoporous composite nanomaterial and preparation method thereof
  • Au@SiO2 mesoporous composite nanomaterial and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] a. Use an electronic balance to weigh 1.38g of cetyltrimethylammonium bromide (CTAB), add it into 70mL of deionized water and ultrasonically dissolve it; measure 15mL of ethyl acetate (EA) and 5mL of ethanol into the above solution , after stirring evenly, add 0.8mL ammonia water (25~28wt%), then add 2.5mL tetraethyl orthosilicate (TEOS), and continue stirring for 30min;

[0024] b. Pour the above mixed solution into a 150mL autoclave lined with polytetrafluoroethylene, and react at 100°C for 24 hours; after the reaction is completed, centrifuge the reactant and wash it repeatedly with ethanol and deionized water Finally, dry at 60°C;

[0025] c. Dissolve the product after centrifugation and drying in 1μg / mL acetone, react at 60°C for 6h, repeat two to three times, and then dissolve 100mg of the product obtained after conventional centrifugation, washing, drying and other steps into 100mL Add 100 μL of 3-aminopropyltriethoxysilane (APTES) to isopropanol, sonicate for 0...

Embodiment 2

[0029] The preparation process and steps of this embodiment are basically the same as in Example 1, except that the d step:

[0030] No 3-aminopropyltriethoxysilane (APTES) was added.

[0031] The results obtained are not significantly different from those of Example 1 in morphology and pore structure, but only a small amount of Au nanoparticles are loaded on the surface and the agglomeration is serious, and the particle size of individual Au nanoparticles reaches more than 20nm.

Embodiment 3

[0033] The preparation process and steps of this embodiment are basically the same as in Example 1, except that the b step:

[0034] Measure 15mL of ethyl acetate (EA) and 10mL of ethanol into the above solution.

[0035]The results obtained are quite different from those in Example 1, Au@SiO 2 The particle size becomes larger obviously, about 250nm, and the whole is emissive channel structure.

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Abstract

The invention relates to an Au@SiO2 mesoporous composite nanomaterial and a preparation method thereof. Tetraethoxysilane is adopted as a silicon source, cetyl trimethyl ammonium bromide (CTAB) is adopted as a structure-directing agent, ethyl acetate (EA) is adopted as a co-template, water and ethyl alcohol are adopted as a cosolvent, CTAB and other residual organic matter are removed through acetone, 3-aminopropyl triethoxy silane (APTES) is modified to obtain SiO2, then a water solution of SiO2 of HAuCl4 is reduced through sodium borohydride (NaBH4), and then the nanomaterial with Au@SiO2 mesoporous composite nanoparticles is obtained, wherein the nanomaterial is uniform in appearance, and parallel open-framework structures and radial open-framework structures coexist. It can be seen from a TEM picture that the prepared Au@SiO2 mesoporous composite nanomaterial is provided with the parallel open-framework structures and the radial open-framework structures, the grain size of the SiO2 nanoparticles is about 150 nm, and Au nanoparticles are uniform in size and even in distribution. The Au@SiO2 mesoporous composite nanomaterial prepared through the method has potential application prospects in the fields of catalyzing, biomedicine and the like.

Description

technical field [0001] The present invention relates to a kind of Au@SiO 2 Mesoporous composite nanomaterial and its preparation method. Background technique [0002] With the development of nanotechnology, mesoporous nanomaterials have been widely used in catalysis, adsorption, separation and drug delivery. Compared with traditional materials, mesoporous materials have outstanding advantages such as high specific surface area, adjustable pore size, variable channel shape and rich composition. Among them, mesoporous silica nanomaterials are favored because of their precise controllability of hydrolysis and polycondensation process, stable amorphous network structure and easy modification of inner and outer surfaces. [0003] At present, the methods for synthesizing ordered mesoporous silica mainly include sol-gel method, template method, microemulsion method and hydrothermal synthesis method, etc., but the pores of mesoporous silica nanoparticles synthesized by these metho...

Claims

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Application Information

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IPC IPC(8): C01B33/12B82Y30/00B22F9/24
Inventor 张海娇伍路朱学栋王艺佳耿翔
Owner SHANGHAI UNIV
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