Silver nanocrystalline preparation method with surface raman enhancing effect
A surface Raman-enhanced, silver nanocrystal technology, applied in the field of materials chemistry, can solve the problems of unstable substrate, poor repeatability, limited SERS commercial application, etc., to achieve simple operation, low cost, and stable structure and morphology control. Effect
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[0018] Example 1:
[0019] Synthesis method of silver nanosol
[0020] First, dissolve 1.0g of PVP in 20ml of deionized water; add 10ml, 0.1mol / L NaOH solution and 10ml, 0.2mol / L glucose solution to the above solution in turn, stir with a glass rod; add 20ml, 0.05mol / L of silver nitrate solution, it will be observed that the solution turns black gray immediately; add the above reaction solution into a 100ml reaction kettle, and react at 140°C for 6h. The product was added to deionized water and centrifuged at 10,000 r for 10 min, the supernatant was removed, and pure deionized water was added to continue centrifugation. The powder samples were evenly loaded on a glass slide, and a certain concentration of PVP and pyridine solutions were added dropwise to test the Raman enhancement effect.
[0021] figure 1 Shows the synthesized silver nanosol with a size of 50 nm; figure 2 It shows that the synthesized silver nanocrystals have a good Raman enhancement effect on PVP, wher...
Example Embodiment
[0022] Example 2:
[0023] First, dissolve 0.5g of PVP in 20ml of deionized water; add 5ml, 0.1mol / L NaOH solution and 5ml, 0.2mol / L glucose solution to the above solution in turn, stir evenly with a glass rod; add 20ml, 0.05mol / L of silver nitrate solution, it will be observed that the solution turns black gray immediately; add the above reaction solution into a 100ml reaction kettle, and react at 150°C for 6h. The product was added to deionized water and centrifuged at 10,000 r for 10 min, the supernatant was removed, and pure deionized water was added to continue centrifugation. The powder samples were evenly loaded on a glass slide, and a certain concentration of PVP and pyridine solutions were added dropwise to test the Raman enhancement effect. The size of the prepared nanoparticles is about 40 nanometers, which has a certain enhancement effect on PVP and pyridine.
Example Embodiment
[0024] Example 3:
[0025] First, dissolve 1.5g of PVP in 20ml of deionized water; add 15ml, 0.1mol / L of NaOH solution and 15ml, 0.2mol / L of glucose solution to the above solution in turn, stir with a glass rod; add 20ml, 0.05mol / L of silver nitrate solution, it will be observed that the solution turns black gray immediately; add the above reaction solution into a 100ml reaction kettle, and react at 130°C for 6h. The product was added to deionized water and centrifuged at 10,000 r for 10 min, the supernatant was removed, and pure deionized water was added to continue centrifugation. The powder samples were evenly loaded on a glass slide, and a certain concentration of PVP and pyridine solutions were added dropwise to test the Raman enhancement effect. The size of the prepared nanoparticles is about 60 nanometers, which has a certain enhancement effect on PVP and pyridine.
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