Method for compounding S-N co-doped fluorescent carbon dots through microwave heating
A technology of fluorescent carbon dots and microwave heating, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as limited carbon dots, and achieve the effects of convenient operation, fast and efficient reaction, and high fluorescence quantum yield.
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Embodiment 1
[0012] The synthesis equation of ethylenediamine and sulfuric acid to synthesize sulfur and nitrogen co-doped fluorescent carbon points involved in the present invention is:
[0013]
[0014] First, add 0.45mL (0.824g) of concentrated sulfuric acid passivator with a mass concentration of 98% to 10mL of distilled water, and add 0.25mL (0.225g) of ethylenediamine while stirring to obtain a colorless and transparent solution; then the obtained colorless and transparent Heat the solution in an 800W household microwave oven for 130s to obtain a bright black foamy solid; dissolve the bright black foamy solid with 10mL of distilled water and then ultrasonicate the resulting solution for 5 minutes; finally filter the ultrasonicated solution with a 0.1μm filter membrane , Dilute the resulting filtrate (sulfur and nitrogen co-doped fluorescent carbon dot solution) to a 1000mL volumetric flask. Take 3.0 mL of the solution and place it in an LS-55 fluorescence spectrophotometer (Perkin...
Embodiment 2
[0017] First, add 0.45 mL of concentrated sulfuric acid with a mass concentration of 98% to 10 mL of distilled water, and add 0.25 mL (0.225 g) of ethylenediamine while stirring to obtain a colorless and transparent solution. Eight groups of the above solutions are arranged in parallel; Heating in an 800W household microwave oven for 90s, 100s, 110s, 120s, 130s, 140s, 150s, 160s to obtain solids in different states; dissolve the solids with 10mL distilled water and then ultrasonicate the resulting solution for 5 minutes; Suction filtration with a filter membrane of μm, and dilute the resulting filtrate (sulfur and nitrogen co-doped fluorescent carbon dot solution) to a 1000mL volumetric flask. Take 3.0 mL of the solution and place it in an LS-55 fluorescence spectrophotometer (PerkinElmer, USA) to measure its fluorescence value (Table 1).
[0018] Table 1 Effect of reaction time on fluorescence intensity of obtained sulfur and nitrogen co-doped fluorescent carbon dot solution ...
Embodiment 3
[0022] First, add 0.20mL, 0.25mL, 0.30mL, 0.35mL, 0.40mL, 0.45mL, 0.50mL, 0.55mL of concentrated sulfuric acid with a mass concentration of 98% into 10mL of distilled water, and add 0.25mL (0.225g ) ethylenediamine to obtain a solution; then place the obtained solution in an 800W household microwave oven and heat for 130s to obtain solids in different states; dissolve the solid with 10mL distilled water and then ultrasonicate the obtained solution for 5 minutes; Suction filtration with a filter membrane, and the obtained filtrate (sulfur and nitrogen co-doped fluorescent carbon dot solution) was adjusted to a 1000mL volumetric flask. Take 3.0 mL of the solution and place it in an LS-55 fluorescence spectrophotometer (PerkinElmer, USA) to measure its fluorescence value (Table 2).
[0023] Table 2 The influence of the amount of sulfuric acid on the fluorescence intensity of the obtained sulfur and nitrogen co-doped fluorescent carbon dot solution
[0024] Sulfuric acid...
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