Preparation method of PEI-CDs (polyetherimide-carbon dots) capable of emitting orange fluorescence
A fluorescence emission, orange technology, applied in the field of preparation of orange fluorescence emission carbon dots, can solve the problems of time-consuming, complicated operation, low yield, etc., and achieve the effect of low drying cost, high cell safety, and high yield
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[0030] The preparation method of orange fluorescent emission PEI-CDs, the steps are as follows:
[0031] (1) Weigh TMB and PEI into a centrifuge tube, add ultrapure water, sonicate until completely dissolved, transfer to an autoclave, and react at 100-140°C for 1-4 hours to obtain a dark brown stock solution;
[0032] The concentration of TMB in the reaction system is 0.015-0.150 mol / L;
[0033] The concentration ratio of TMB to PEI is 1:1~10:1.
[0034] (2) Cool the raw solution to room temperature, transfer it to a dialysis bag with a molecular weight cut-off of 1000, and dialyze it for 6 h, then use a rotary evaporator to rotary evaporate the obtained dialysate to 2 mL at 60 °C. Then, to purify the dialysate, first add an appropriate amount of absolute ethanol, then add petroleum ether dropwise, precipitate, centrifuge, discard the supernatant to obtain PEI-CDs precipitate, and wash the precipitate 3 times with petroleum ether. Finally, the precipitate was vacuum-dried at...
Embodiment 5-9
[0039] As can be seen from Examples 5-9 (the impact of TMB concentration), when the concentration of TMB is
[0040] When the concentration was 0.070 mol / L, the synthesis yield of PEI-CDs was the highest, the emission wavelength was the longest, and the PLQY was the largest.
[0041] Examples 10-14 illustrate that the concentration ratio of reactants is an important factor affecting the reaction of TMB and PEI. With the gradual increase of the concentration ratio of TMB and PEI, the synthesis yield and emission wavelength of PEI-CDs gradually decreased. However, the change of PLQY was in the form of a peak curve, and reached the maximum at the concentration ratio of TMB and PEI of 2:1, because with the increase of TMB dosage, the carbon source increased, and more CDs were absorbed by -NH 2 Modified to generate PEI-CD, the fluorescence performance of CDs is improved, so the PLQY gradually increases; however, when the concentration ratio of TMB and PEI is too large, the amount ...
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