N-CQDs (nitrogen-doped carbon quantum dots) with high fluorescence quantum yield as well as preparation method and application of N-CQDs
A technology of fluorescence quantum yield and carbon quantum dots, which is applied in the direction of fluorescence/phosphorescence, chemical instruments and methods, luminescent materials, etc., can solve the problems of complicated preparation process and low fluorescence quantum yield, and achieve low cytotoxicity and biophase Good capacitance and small molecular weight
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Embodiment 1
[0040] A method for preparing nitrogen-doped carbon quantum dots of the present invention, comprising the steps of:
[0041] Step 1. Weigh 2.673g of alanine (Ala) into a 50mL clean beaker, add 30.0mL of ultrapure water, put it into an ultrasonic instrument for 2 minutes, and slowly add 500μL of ethylenediamine (EDA), Ala and EDA while stirring The molar ratio is 4:1;
[0042] Step 2. Transfer the above mixed solution to the lining of a 50mL polytetrafluoroethylene reactor and install a sealed steel sleeve, place it in a blast heating box, gradually heat it to 200°C and keep the temperature constant for 6 hours;
[0043] Step 3, after the reaction finishes, cool down to room temperature naturally to obtain a tan transparent solution;
[0044] Step 4, the solution is dialyzed in ultrapure water for 24 hours with a dialysis bag with a molecular weight cut-off MWCO=1000Da to remove unreacted precursors;
[0045] Step 5. The dialyzed carbon quantum dot solution is rotatably evapo...
Embodiment 2
[0048] A method for preparing nitrogen-doped carbon quantum dots, the only difference between Example 2 and Example 1 is that the amount of EDA in step 1 is 2.0mL, and the molar ratio of Ala to EDA is 4:4, and the prepared N-CQDs The fluorescence quantum yield is 33.3%.
Embodiment 3
[0050] A method for preparing nitrogen-doped carbon quantum dots, the only difference between embodiment 3 and embodiment 2 is that the hydrothermal temperature in step 2 is 150°C, and the fluorescence quantum yield of the prepared N-CQDs is 8.64%.
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