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Preparation method of nanogold-platinum composite material in mesoporous silica

A technology of mesoporous silica and composite materials, applied in nanotechnology, metal processing equipment, coatings, etc., can solve the problems of uneven synthesis results, low synthesis efficiency of gold nanorods-platinum composite materials, etc., and achieve stable products , the synthetic method is simple, the effect of strong reliability

Pending Publication Date: 2021-05-28
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0004] In order to solve the technical problems of low synthesis efficiency of gold nanorods-platinum composites and uneven final synthesis results, the present invention provides a method for preparing nano-gold-platinum composites in mesoporous silica, which can efficiently synthesize uniform Gold nanorod-platinum composites in mesoporous silica with simple reaction conditions and low cost

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  • Preparation method of nanogold-platinum composite material in mesoporous silica

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[0032] see figure 1 , shows the preparation method of nano-gold-platinum composite material in mesoporous silica proposed by the present invention, which specifically includes the following steps:

[0033] Step S1, using the seed growth method to prepare gold nanorods.

[0034] Step S2, the etching and silica coating process, that is, take the gold nanorods that have been washed and dispersed in 2mM CTAB, centrifuge them into a certain amount of NaOH solution, and then add the TEOS solution in 6 times at intervals of 30 minutes, Stir for 2 days to obtain gold nanorods coated with mesoporous silica, then add methanol to the gold nanorods coated with mesoporous silica, place them in an oil bath at 60°C, control the amount of hydrochloric acid added, and gold nanorods The rod corrodes.

[0035] Step S3, the regrowth process, that is, taking out the corroded gold nanorods coated with silicon dioxide, adding potassium tetrachloroplatinate solution and ascorbic acid solution, stir...

Embodiment 1

[0049] Mix 10mL CTAB (0.1M) with 0.25mL HAuCl 4 (10mM) is mixed in the bottle, and a certain mass of NaBH 4 Mix to form a 0.01M solution, and add 0.6mL to the bottle and stir vigorously. The solution turns from golden yellow to brown, which is the seed solution. 2.5 mL of CTAB (0.1 M) and 0.037 g of NaOL were dissolved in 21.25 mL of water at 50°C. After dissolution, the solution was cooled to 30 °C, and then 0.9 mL AgNO was added 3 (4mM) solution. and kept at 30°C for 15 minutes, then added 0.25mL HAuCl 4 (10mM). After 60-90 minutes of stirring (400 rpm), the solution changed from golden yellow to colorless. This is the growth solution. The pH was adjusted by adding 0.3 mL of HCl (37 wt.%) to the growth solution. After that, 75 μL of AA (64 mM), 40 μL of seed solution were added sequentially and stirred vigorously. The final solution was left to stand for 12 hours in a 30°C water bath. The solution after growth was centrifuged (7000rpm, 30 minutes), and CTAB (1-2mM)...

Embodiment 2

[0051] Mix 10mL CTAB (0.1M) with 0.25mL HAuCl 4 (10mM) is mixed in the bottle, and a certain mass of NaBH 4 Mix to form a 0.01M solution, and add 0.6mL to the bottle and stir vigorously. The solution turns from golden yellow to brown, which is the seed solution. 2.5 mL of CTAB (0.1 M) and 0.037 g of NaOL were dissolved in 21.25 mL of water at 50°C. After dissolution, the solution was cooled to 30 °C, and then 0.9 mL AgNO was added 3 (4mM) solution. and kept at 30°C for 15 minutes, then added 0.25mL HAuCl 4 (10mM). After 60-90 minutes of stirring (400 rpm), the solution changed from golden yellow to colorless. This is the growth solution. The pH was adjusted by adding 0.3 mL of HCl (37 wt.%) to the growth solution. After that, 75 μL of AA (64 mM), 40 μL of seed solution were added sequentially and stirred vigorously. The final solution was left to stand for 12 hours in a 30°C water bath. The solution after growth was centrifuged (7000rpm, 30 minutes), and CTAB (1-2mM)...

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Abstract

The invention discloses a preparation method of a nanogold-platinum composite material in mesoporous silica. The preparation method comprises the following steps of firstly, preparing a gold nanorod raw material, re-dispersing and adding the gold nanorod raw material to a tetraethoxysilane (TEOS) solution according to a certain mode, growing mesoporous silica on the surface of a gold nanorod, then heating the mesoporous silica coated gold nanorod in an oil bath at 60 DEG C, starting a corrosion process by adding a corresponding amount of hydrochloric acid, then adding a large amount of cold methanol to finish corrosion, centrifuging a product, dispersing obtained precipitate in an aqueous solution, and finally, adding a corresponding amount of potassium tetrachloroplatinate solution, adding a corresponding amount of ascorbic acid solution, stirring for 1 minute, uniformly mixing, and standing for 2 hours to obtain a final product. The nanogold-platinum composite material in the mesoporous silica prepared by the preparation method grows uniformly; the preparation method has the advantages of simple reaction conditions, high reaction rate and low cost.

Description

technical field [0001] The invention relates to the field of synthesis of metal nanomaterials, in particular to a method for preparing nanometer gold-platinum composite materials in mesoporous silica. Background technique [0002] In recent years, the research on noble metal nanoparticles has developed rapidly, among which the research on gold nanorods is the most prominent. Due to the rich chemical and physical properties of gold nanorods, first of all it can be used in life sciences, including in vitro diagnosis, in vivo imaging and in vivo therapy. Secondly, gold nanorods are also widely used in sensors. Because gold nanorods have extremely strong surface Raman scattering enhancement and surface plasmon resonance characteristics, they can be used for trace molecule and ion detection. At the same time, gold nanorods can also be made into optical components, such as near-infrared filters, solar cells, polarizers, etc. In recent years, the excellent properties of bimetalli...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B82Y40/00
CPCB22F9/24B82Y40/00B22F1/07B22F1/17B22F1/16
Inventor 邓天松张棋卫鸣璋顾伊杰程知群
Owner HANGZHOU DIANZI UNIV
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