A preparation method of doped carbon nitride fluorescent quantum dots
A technology of fluorescent quantum dots and carbon nitride, which is applied in chemical instruments and methods, luminescent materials, nanotechnology, etc., can solve the limitation of mass production and wide application of carbon nitride quantum dots, and the size uniformity of quantum dots is not very ideal , low yield of quantum dots and other issues, to achieve the effect of small particle size, increased fluorescence luminescence intensity and fluorescence quantum yield, and uniform particle size distribution
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Embodiment 1
[0025] Weigh 1.0 g of melamine and 0.2 g of ammonium fluoride according to a mass ratio of 5:1, add the melamine and ammonium fluoride into a mortar, grind and mix well. Put it into a crucible, calcinate it in a tube furnace at 550°C and keep it warm for 2 hours to obtain a fluorine-doped carbon nitride powder material.
[0026] Put the prepared doped carbon nitride powder material into a centrifuge tube, add analytically pure ethylene glycol solution as a solvent, and add 1 g of doped carbon nitride powder per liter of ethylene glycol solution. The centrifuge tube was placed in an ultrasonic cleaner and ultrasonically crushed for 5 hours at a power of 160W, and the supernatant was placed in a high-speed centrifuge and centrifuged at a centrifugal rate of 12000rpm for 10 minutes to obtain a solution doped with highly fluorescent carbon nitride quantum dots. The above solution was dried in an oven at 60° C. to constant weight to obtain fluorine-doped carbon nitride quantum dots...
Embodiment 2
[0028] Weigh melamine 1.0g and B by mass ratio 20:1 2 o 3 0.05g, the melamine and B 2 o 3 Add to mortar and grind to combine. Put it into a crucible, calcinate in a tube furnace at 500°C and keep it warm for 4 hours to obtain a boron-doped carbon nitride powder material.
[0029] The prepared doped carbon nitride powder material is put into a centrifuge tube, and an analytically pure ethylene glycol solution is added as a solvent. Add 10 g of doped carbon nitride powder per liter of ethylene glycol solution. The centrifuge tube was placed in an ultrasonic cleaner and ultrasonically crushed for 2 hours at a power of 170W, and the supernatant was placed in a high-speed centrifuge and centrifuged at a centrifugal rate of 12000rpm for 10 minutes to obtain a solution doped with highly fluorescent carbon nitride quantum dots. Put the above solution in an oven at 60°C and dry to constant weight to obtain boron-doped carbon nitride quantum dots. The particle size is 3-4nm. The...
Embodiment 3
[0031] Weigh 1.0 g of melamine and 0.2 g of thiourea according to a mass ratio of 5:1, and add the melamine and thiourea into a mortar for grinding and mixing. Put it into a crucible, calcinate it in a tube furnace at 550°C and keep it warm for 4 hours to obtain a sulfur-doped carbon nitride powder material.
[0032] The prepared sulfur-doped carbon nitride powder material is put into a centrifuge tube, and an analytically pure glycerol solution is added as a solvent. Add 5 g of doped carbon nitride powder into every liter of pure glycerol solution. The centrifuge tube was placed in an ultrasonic cleaner and ultrasonically crushed for 5 h at a power of 160 W. The supernatant was placed in a high-speed centrifuge and centrifuged at a centrifugal rate of 12000 rpm for 10 minutes to obtain a solution doped with carbon nitride quantum dots with high fluorescence. Put the above solution in an oven at 80°C and dry to constant weight to obtain sulfur-doped carbon nitride quantum do...
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