A carbon dot with intrinsic antibacterial activity and photodynamically enhanced bactericidal effect, its preparation method and application
A technology of antibacterial activity and bactericidal effect, applied in the field of fluorescence and antibacterial carbon nanomaterials, can solve the problems of rarely red fluorescence emission, unstable biocompatibility, poor biofilm permeability, etc., and achieve good biocompatibility , good bactericidal performance, improve the effect of antibacterial efficiency
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Embodiment 1
[0040] Step 1, 2,4-dihydroxybenzoic acid and 6-bromo-2-naphthol are dissolved in methanol to prepare a solution with a mass fraction of 0.5%.
[0041] Step 2, take 10 mL of the above solution and place it in a 50 mL high temperature and high pressure reaction kettle, place the reaction kettle in an oven, and react at 180°C for 30 min, 4 h, 8 h, 12 h, and 24 h, and then cool the reaction kettle to room temperature and take out.
[0042] In step 3, the reaction solution is centrifuged and filtered to obtain a clear dark red solution, and finally a dark red solid powder is obtained, which is the target product, which is dried in a vacuum drying box and sealed for preservation.
[0043] Step 4: Characterize the carbon dots in this example. The high-resolution transmission electron microscope image of the carbon dots prepared in this example is shown in Figure 1. The figure shows that the average particle size of the carbon dots is 3.32nm±0.96nm. The absolute fluorescence quantum y...
Embodiment 2
[0046] Step 1, 2,4-dihydroxybenzoic acid and 6-bromo-2-naphthol are dissolved in methanol to prepare a solution with a mass fraction of 2%.
[0047] Step 2, take 10 mL of the above solution and place it in a 50 mL high temperature and high pressure reaction kettle, place the reaction kettle in an oven, and react at 160° C. for 4h, 8h, 12h, and 24h respectively, then cool the reaction kettle to room temperature and take it out.
[0048] Step 3, centrifuge and filter to obtain a clear solution, judged by the color of the solution, the color of the solution at 4h and 8h is light yellow, and the maximum fluorescence emission peak is at 540nm, the color of the solution at 12h and 24h is yellow, and the position of the maximum emission peak is at 600nm. The fluorescence quantum yields were 1.2% and 2.2%, respectively.
Embodiment 3
[0050] Step 1, 2,4-dihydroxybenzoic acid and 6-bromo-2-naphthol are dissolved in methanol to prepare a solution with a mass fraction of 5%.
[0051] Step 2, take 10 mL of the above solution and put it in a 50 mL high temperature and high pressure reaction kettle, put the reaction kettle in an oven, react at 220°C for 4h, 8h and 10h respectively, then cool the reaction kettle to room temperature and take it out.
[0052] Step 3, centrifuge, filter to obtain a clear dark red solution, and finally obtain a dark red solid powder, which is the target product, which is dried in a vacuum drying box and sealed for preservation.
[0053] In step 4, the absolute fluorescence quantum yields were measured to be 1.7%, 2.4% and 1.3%, respectively.
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