Composite material, preparation method thereof and film
A composite material and condensation reaction technology, which is applied in the field of nanomaterials, can solve the problems of poor film-forming quality and fluorescence quenching of carbon quantum dots, and achieve the effects of improving dispersion, high fluorescence quantum yield, and not being prone to fluorescence quenching
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[0017] On the one hand, the embodiment of the present invention provides a kind of preparation method of composite material, such as figure 1 Shown, this preparation method comprises the steps:
[0018] S01: providing carbon quantum dots with carboxyl groups attached to the surface of the carbon quantum dots;
[0019] S02: dissolving the alkylamine and / or alkanol and the carbon quantum dots in a solvent, performing a condensation reaction, and then separating the solid and liquid to obtain the composite material.
[0020] In the preparation method of the composite material provided by the embodiment of the present invention, alkylamine and / or alkanol are subjected to condensation reaction with carbon quantum dots with carboxyl groups on the surface, thereby introducing alkyl groups on the surface of carbon quantum dots, and the finally obtained composite material includes carbon quantum dots. Quantum dots and alkyl groups bound to the surface of carbon quantum dots; the prepa...
Embodiment 1
[0039] (1) Preparation of carbon quantum dots with surface-modified carboxyl groups:
[0040] Weigh 0.05-0.1mol of citric acid and 0.05-0.1mol of phthalic acid into a hydrothermal reactor, add 5-10ml of deionized water, and stir evenly; Tighten the seal, put it into an oven, control the reaction temperature at 200-250 degrees Celsius, and control the reaction time at 3-5 hours. Immediately after the completion of the reaction, the solution is taken out and poured into a dialysis bag for dialysis treatment. The dialysis time is controlled at 10-48 hours, and the molecular weight cut-off of the dialysis bag is planted at 1000-3000Da. Putting the dialyzed solution into an oven for drying at 60-80 degrees Celsius for 5-10 hours to obtain the desired carbon quantum dots with carboxyl groups on the surface.
[0041] (2) Preparation of composite materials, that is, carbon quantum dots wrapped by long-chain alkyl groups:
[0042] Weigh 1g of the previously prepared carbon quantum do...
Embodiment 2
[0046] (1) Preparation of carbon quantum dots with surface-modified carboxyl groups:
[0047] Weigh 0.05-0.1mol of glucose and 0.05-0.1mol of phthalic acid into a hydrothermal reactor, add 5-10ml of deionized water, and stir evenly; then tighten the reactor with the mixed solution Seal it, put it into an oven, control the reaction temperature at 200-250 degrees Celsius, and control the reaction time at 3-5 hours. Immediately after the completion of the reaction, the solution is taken out and poured into a dialysis bag for dialysis treatment. The dialysis time is controlled at 10-48 hours, and the molecular weight cut-off of the dialysis bag is planted at 1000-3000Da. Putting the dialyzed solution into an oven for drying at 60-80 degrees Celsius for 5-10 hours to obtain the desired carbon quantum dots with carboxyl groups on the surface.
[0048] (2) Preparation of composite materials, that is, carbon quantum dots wrapped by long-chain alkyl groups:
[0049] Weigh 1g of the p...
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