Triple optical anti-counterfeiting ink with fluorescence, delayed fluorescence and room temperature phosphorescence, as well as anti-counterfeiting method and application thereof
A technology of delayed fluorescence and room temperature phosphorescence, which is applied in inks, applications, household appliances, etc., can solve the problems of restricted applications, and achieve the effects of high encryption level, good dispersion, and high security
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Embodiment 1
[0027] Preparation of carbon dot 1 (NCD1) and carbon dot 1 anti-counterfeiting ink with only fluorescence
[0028] Weigh 1g of folic acid and evenly disperse it in 30mL of toluene, transfer it to a 100mL polytetrafluoroethylene-lined stainless steel reaction kettle, tighten the lid, and conduct a hydrothermal reaction at 290°C for 1h. Allow the reactor to cool down to room temperature naturally, and centrifuge for 5-10 minutes at a rotational speed of 8000 r / min to remove the supernatant. The precipitate was put into a vacuum drying oven, and dried under vacuum at 100° C. for 12 hours to obtain a solid powder of carbon dot 1 . Take 50 mg of carbon dot 1 solid powder and disperse it in 5 mL of deionized water to prepare 10 mg / mL carbon dot 1 anti-counterfeiting ink with only fluorescence.
[0029] Preparation of carbon dot 1 composite powder (NCD1-C)
[0030] Take 15mg of carbon dot 1 solid powder and disperse in 6mL of 1g / mL urea aqueous solution. The mixed solution was tra...
Embodiment 2
[0035] Preparation of carbon dots 2 (NCD2)
[0036] Weigh 1g of folic acid and evenly disperse it in 30mL of N,N-dimethylformamide, transfer it to a 100mL polytetrafluoroethylene-lined stainless steel reaction kettle, tighten the lid of the kettle, and conduct a hydrothermal reaction at 290°C for 1h. Allow the reactor to cool down to room temperature naturally, and centrifuge for 5-10 minutes at a rotational speed of 8000 r / min to remove the supernatant. The precipitate was put into a vacuum drying oven, and dried under vacuum at 100° C. for 12 hours to obtain a solid powder of carbon dot 2 .
[0037] Preparation of carbon dots 2 composite powder (NCD2-C)
[0038] Take 15mg of carbon dot 2 solid powder and disperse in 6mL of 1g / mL urea aqueous solution. The mixed solution was transferred to a three-necked flask, and reacted in an oil bath at 180° C. until solids were precipitated. After natural cooling to room temperature, the carbon dots 2 composite powder containing nitro...
Embodiment 3
[0042] Preparation of carbon dots 3 (NCD3)
[0043] Weigh 1g of folic acid and evenly disperse it in 30mL of acetone, transfer it to a 100mL polytetrafluoroethylene-lined stainless steel reaction kettle, tighten the lid of the kettle, and conduct a hydrothermal reaction at 290°C for 1h. Allow the reactor to cool down to room temperature naturally, and centrifuge for 5-10 minutes at a rotational speed of 8000 r / min to remove the supernatant. The precipitate was put into a vacuum drying oven, and dried under vacuum at 100° C. for 12 hours to obtain a solid powder of carbon dot 3 .
[0044] Preparation of carbon dot 3 composite powder (NCD3-C)
[0045] Take 15mg of carbon dot 3 solid powder and disperse in 6mL of 1g / mL urea aqueous solution. The mixed solution was transferred to a three-necked flask, and reacted in an oil bath at 180° C. until solids were precipitated. After natural cooling to room temperature, the carbon dots 3 composite powder containing nitrogen-doped carbon ...
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