a kind of nayf 4 Nanocomposite material with carbon dots and its preparation method and application
A technology of nanocomposite materials and carbon dots, which is applied in the field of nanomaterials to achieve the effects of low production cost, uniform distribution, and uniform particle size
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Embodiment 1
[0045] Example 1: NaYF 4 Preparation of nanoparticles
[0046] A, join 1.538mmol sodium chloride in the 50mL beaker that contains 30mL ethylene glycol; Stir well, add 0.6mL PEI (polyethyleneimine) in the mixed solution, stir for 30 minutes, then add 1mmol rare earth ion solution (rare earth The ionic solution contains the following ions in molar percentages: Y 3+ 79%, Yb 3+ 20%, Tm 3+ 1%); stir until clear, add 4 mmol ammonium fluoride, and stir for another 10 minutes.
[0047] B. Transfer the solution obtained in the above step A to a 50mL autoclave, place it in an oven at 200°C and heat it for 12 hours. After the reaction, it is naturally cooled to room temperature. The sample is centrifuged, washed with water and ethanol several times, and then freeze-dried to obtain NaYF 4 nanoparticles.
[0048] figure 1 Figure A in the NaYF that embodiment 1 obtains 4 SEM images of nanoparticles, doped with Tm 3+ The ratio of the amount of the contained substances can range from...
Embodiment 2
[0050] NaYF 4 Preparation of nanocomposites with carbon dots
[0051] C, the NaYF prepared by embodiment 1 4 Nanoparticles dispersed in 200mg PVP-k30 in 5mL H 2 O solution, and then sonicate for 30 minutes; after mixing the resulting solution with 20mL of ethanol, add 0.8mL of ammonia solution and sonicate for 20 minutes; then, add 0.2mL of tetraethyl orthosilicate solution and stir the solution overnight at room temperature; The resulting product was washed 3 times with ethanol to obtain NaYF 4 @SiO 2 Nanoparticles; add 1 mL of carbon dot solution with a concentration of 0.01 g / mL; the resulting product is washed 3 times with ethanol.
[0052] D. Dry the precipitate in an oven at 80°C for 12 hours to obtain powdered NaYF 4 with carbon dot nanocomposites.
[0053] figure 1 Figure B in the NaYF that embodiment 2 obtains 4 SEM images of nanocomposites with carbon dots, figure 2 NaYF obtained for Example 2 4 / Transmission electron micrograph of carbon dot nanocomposit...
Embodiment 3
[0058] NaYF 4 Application of carbon dot nanocomposites in the preparation of anti-counterfeiting LCF film:
[0059] E. Disperse 0.25 g of polyethylene (PVA) in 5 mL of deionized water, and stir in a water bath at 80° C. for 30 minutes. Join NaYF 4 and carbon dot nanocomposite material 0.1g, stirred at room temperature for 2 hours.
[0060] F. Take a petri dish with a diameter of 7.5 cm, slowly pour the reactants into the petri dish, remove air bubbles, dry under vacuum at 60°C, and plastic film for 4 hours.
[0061] G. After the plastic film is formed, it is naturally cooled until the film is naturally detached from the culture dish, and the film is taken out.
[0062] Figure 6 For the NaYF obtained in Example 1 4 The picture of the LCF film prepared with the carbon dot nanocomposite material. It can be seen from the picture that the prepared film is transparent. The film appears blue-green under the irradiation of ultraviolet light, and emits bright blue-purple light un...
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