Preparation method for growing silver composite material on surface of mesoporous silica coated gold nanorod
A technology of mesoporous silica and gold nanorods, applied in nanotechnology, nanotechnology, metal processing equipment, etc., can solve the problems of uneven synthesis results and low synthesis efficiency, and achieve product stability, strong reliability, enhanced The effect of catalytic performance
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[0031] see figure 1 , showing the synthesis method of the gold-silver material proposed by the present invention, which specifically includes the following steps:
[0032] Step S1, using the seed growth method to prepare gold nanorods.
[0033] Step S2, the corrosion process, that is, take the gold nanorods that have been cleaned and dispersed in low-concentration cetyltrimethylammonium bromide (CTAB), centrifuge them into a certain amount of NaOH solution, and then add them at intervals of 30 minutes. Add TEOS solution in 6 times and stir for two 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, and control the addition The amount of hydrochloric acid will corrode the gold nanorods.
[0034] Step S3, the re-growth process, that is, take out the corroded gold nanorods coated with silica, then add silver nitrate solution, ascorbic acid solution, and stir for 2 mi...
Embodiment 1
[0048] Mix 10mL CTAB (0.1M) with 0.25mL HAuCl 4 (10mM) mixed in the bottle, mixed with a certain mass of NaBH4 weighed with ice-water mixture to make a 0.01M solution, and added 0.6mL to the bottle and stirred 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 (7000...
Embodiment 2
[0050] 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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