Nitrogen and chlorine co-doped graphene quantum dot with ultra-small size and dual-emission of blue light and green light, and preparation method of graphene quantum dot
A technology of graphene quantum dots and blue-green light, which is applied in the direction of graphene, chemical instruments and methods, and luminescent materials, can solve the problems of single fluorescence emission, large size, and single doping element, and achieve stable luminescence performance and experimental The effect of low equipment requirements and uniform size distribution
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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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