Preparation method of gold-platinum-silver material with asymmetric structure

An asymmetric structure and seed technology, applied in the field of preparation of gold-platinum-silver materials, can solve the problems of low synthesis efficiency and uneven synthesis results of gold-platinum-silver materials, and achieve simple synthesis methods, strong reliability, The effect of enhancing the catalytic activity

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

[0004] In order to solve the problem of low synthesis efficiency of gold-platinum-silver materials and uneven final synthesis results, the present invention provides a gold-platinum-silver material with an asymmetric structure and its preparation method, which can efficiently synthesize uniform and asymmetric The gold-platinum-silver material, and the reaction conditions are simple and the cost is low

Method used

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  • Preparation method of gold-platinum-silver material with asymmetric structure
  • Preparation method of gold-platinum-silver material with asymmetric structure
  • Preparation method of gold-platinum-silver material with asymmetric structure

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preparation example Construction

[0036] see figure 1, shows a method for synthesizing a gold-platinum-silver material with an asymmetric structure proposed by the present invention, which specifically includes the following steps:

[0037] Step S1, using the seed growth method to prepare gold nanorods (see figure 2 ).

[0038] Step S2, take the gold nanorods that have been cleaned and dispersed in low-concentration CTAB as new seeds, add a corresponding amount of CTAB, silver nitrate solution, and potassium tetrachloroplatinate solution on the seeds, and control the reaction temperature Synthetic gold-platinum bimetallic structure;

[0039] Step S3, take out the gold-platinum that has been cleaned and dispersed in low-concentration CTAB as new seeds, then add CTAC, and heat at 60°C for 20 minutes; then control the rate of adding silver nitrate and ascorbic acid, and heat for two hours to synthesize gold - Platinum-silver material.

[0040] Wherein, the step S1 further includes the following steps:

[00...

Embodiment 1

[0053] 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

[0055] 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 gold-platinum-silver material with an asymmetric structure. The preparation method mainly comprises the following steps of firstly, growing a gold nanorod by using a seed growth method, then cleaning the successfully grown gold nanorod to obtain a gold nanorod with higher purity, then taking the gold nanorod as a seed, adding a corresponding amount of surfactant and potassium tetrachloroplatinate, uniformly mixing, and controlling the reaction temperature, so that platinum successfully grows on the two ends of the gold nanorod, then cleaning a gold-platinum structure to obtain gold-platinum with higher purity, taking the gold-platinum as a new seed, adding a corresponding amount of the surfactant, silver nitrate and ascorbic acid solution, controlling the reaction temperature to finally obtain the asymmetric growth gold-platinum-silver material, and observing the growth condition through a transmission electron microscope. The gold-platinum-silver material with the asymmetric structure synthesized by the preparation method is uniform in growth; the preparation method has simple reaction conditions, high reaction rate and low cost.

Description

technical field [0001] The invention relates to the synthesis field of metal nanometer materials, in particular to a preparation method of gold-platinum-silver material with an asymmetric structure. 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 enhanced surface Raman scattering and surface plasmon resonance properties, they can be used for detection of trace molecules and ions. 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 bimetallic structures have grad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00B82Y30/00
CPCB22F9/24B82Y40/00B82Y30/00B22F1/054
Inventor 邓天松张棋卫鸣璋顾伊杰程知群
Owner HANGZHOU DIANZI UNIV
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