Up-conversion nanoparticles and graphene quantum dot composite materials and preparation methods for near-infrared photodynamic therapy and fluorescence imaging
A technology of graphene quantum dots and nanoparticles, applied in the field of composite materials
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[0056] Step 1. Preparation of upconversion nanoparticles β-NaYF 4 :Yb 3+ ,Er 3+
[0057] 0.8mmol YCl 3 ·6H 2 O, 0.18 mmol YbCl 3 ·6H 2 O, 0.02 mmol ErCl 3 ·6H 2 O, 6mL oleic acid and 15mL oleylamine were stirred and mixed uniformly in a 50mL three-necked flask under the protection of argon. Use a temperature-controlled electric heating mantle to heat to 160°C to form a uniform solution, and keep it for one hour, and you can see the dissolution of the rare earth salt. After the solution was cooled to room temperature, add 10mL of 2.5mmol NaOH and 4mmol NH 4 F in methanol and stirred for 30 min. Subsequently, the temperature was raised to 100°C and vacuum was applied to remove methanol, oxygen and moisture in the solution. Argon was then bubbled through the solution and the temperature was raised to 300°C for 1 hour. After the solution was cooled to room temperature, the obtained nanocrystals were precipitated with absolute ethanol, and washed alternately with cycloh...
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