A kind of preparation method of water-soluble fluorescent carbon nanometer powder
A technology of carbon nano-powder and fluorescent powder, which is applied in the field of nano-materials, can solve problems such as inability to emit light, and achieve the effect of simple preparation method and high yield
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Embodiment example 1
[0021] Weigh 1 g of polyvinyl alcohol and dissolve it in 20 mL of water; weigh 0.1 g of sodium hydroxide and add it to the above polyvinyl alcohol solution, and stir evenly with a magnetic stirring bar. The above solution was transferred to a 40 ml polytetrafluoroethylene-lined stainless steel hydrothermal reaction kettle, and reacted at 250° C. for 24 hours. The reaction kettle was naturally cooled to room temperature to obtain a brown aqueous solution of carbon dots.
[0022] Use a high-speed centrifuge at 10,000 rpm for 10 minutes to remove larger particles; use a 3000Da dialysis bag for 3 days to remove unreacted substances and impurity ions. Pour the purified solution into a porcelain dish and put it in a vacuum oven for drying. The dried solid was then ground to obtain about 0.57 g of fine phosphor material, with a yield of nearly 60%.
[0023] Both the aqueous solution and the solid powder of the prepared material can emit yellow-green fluorescence. The carbon quantu...
Embodiment example 2
[0025] Weigh 2 g of polyvinyl alcohol and dissolve it in 20 mL of water; weigh 0.2 g of sodium hydroxide and add it to the above polyvinyl alcohol solution, and stir evenly with a magnetic stirring bar. The above solution was transferred to a 40 ml polytetrafluoroethylene-lined stainless steel hydrothermal reaction kettle, and reacted at 250° C. for 3 hours. The reaction kettle was naturally cooled to room temperature to obtain a brown aqueous solution of carbon dots.
[0026] Use a high-speed centrifuge at 15,000 rpm for 5 minutes to remove larger particles; use a 3,000 Da dialysis bag for dialysis for 3 days to remove unreacted substances and impurity ions. Pour the purified solution into a porcelain basin and put it into a vacuum drying oven for drying. The dried solid is then ground to obtain a fine fluorescent solid powder.
[0027] Both the aqueous solution and the solid powder of the prepared material can emit orange-yellow fluorescence. The carbon quantum dot soluti...
Embodiment example 3
[0029] Weigh 1.5 g of polyvinyl alcohol and dissolve it in 20 mL of water; weigh 0.15 g of sodium hydroxide and add it to the above polyvinyl alcohol solution, and stir evenly with a magnetic stirring bar. The above solution was transferred to a 40 ml polytetrafluoroethylene-lined stainless steel hydrothermal reaction kettle, and reacted at 250° C. for 12 hours. The reaction kettle was naturally cooled to room temperature to obtain a brown aqueous solution of carbon dots.
[0030] Use a high-speed centrifuge at 10,000 rpm for 15 minutes to remove larger particles; use a 3000Da dialysis bag for 4 days to remove unreacted substances and impurity ions. Add 1 g of potassium permanganate powder to the alcoholized solution, react at 50° C. for 12 hours, and repeat the above purification steps to obtain a brown solution. Both the aqueous solution and the solid powder of the prepared material can emit green fluorescence and have fluorescence excitation dependence.
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