Nitrogen and chlorine co-doped graphene quantum dots with ultra-small blue-green double emission and preparation method thereof
A graphene quantum dot, blue-green light technology, applied in graphene, chemical instruments and methods, luminescent materials, etc., can solve the problems of single doping element, single fluorescent emission, large size, etc.
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Embodiment 1
[0024] 1) Preparation of nitrogen and chlorine co-doped graphene quantum dots-GQDs (48h) with ultra-small blue-green double fluorescence emission: Weigh 2mmol of citric acid and 2mmol of 1,2,4-triaminobenzene dihydrochloride respectively and 10 mL of deionized water, and stirred thoroughly for 30 minutes at a constant temperature of 25°C. The mixed solution was transferred into a polytetrafluoroethylene-lined reaction kettle, and after being kept at 200° C. for 48 hours, it was naturally cooled to room temperature to obtain a crude product of nitrogen and chlorine co-doped graphene quantum dots.
[0025] 2) Purification of nitrogen and chlorine co-doped graphene quantum dots: the crude product of the graphene quantum dots obtained in step 1) is put into a dialysis bag with a molecular weight cut-off of 3500Da, dialyzed for 24 hours, and then put into a molecular weight cut-off of 3000Da The dialysis bag, dialysis for 12 hours. Use a rotary evaporator to remove the residual so...
Embodiment 2
[0028] The difference between nitrogen and chlorine co-doped graphene quantum dots-GQDs (24h) with ultra-small size blue-green double fluorescence emission and that of Example 1 is that the hydrothermal reaction was kept at 200° C. for 24 hours.
Embodiment 3
[0030] 1) Preparation of nitrogen and chlorine co-doped graphene quantum dots-GQDs (1:2) with ultra-small blue-green double fluorescence emission: Weigh 2mmol of citric acid and 4mmol of 1,2,4-triaminobenzene di-salt respectively salt and 10 mL of deionized water, and stirred thoroughly at a constant temperature of 25°C for 30 minutes. The mixed solution was transferred into a polytetrafluoroethylene-lined reaction kettle, and after being kept at 200° C. for 24 hours, it was naturally cooled to room temperature to obtain a crude product of nitrogen and chlorine co-doped graphene quantum dots.
[0031] 2) Purification of nitrogen and chlorine co-doped graphene quantum dots: the crude product of the graphene quantum dots obtained in step 1) is put into a dialysis bag with a molecular weight cut-off of 3500Da, dialyzed for 24 hours, and then put into a molecular weight cut-off of 3000Da The dialysis bag, dialysis for 12 hours. Use a rotary evaporator to remove the residual solve...
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