Water-soluble CdTe nano crystal polymer sulface modifying method
A water-soluble polymer, surface modification technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as limiting water-soluble nanocrystals, and achieve good water solubility, good repeatability, and good stability.
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Embodiment 1
[0019] (1). Preparation of sodium telluride hydride:
[0020] 90.5 mg NaBH 4 Put the solid and 91.2 mg of Te powder into a small flask, add 3 ml of water, and react at 10 degrees Celsius for 10 hours to obtain a NaHTe solution for later use;
[0021] (2) Preparation of CdTe nanocrystal solution
[0022] 22.5 mg CdCl 2 Dissolve in 100 ml of water, add 0.03 ml of mercaptoacetic acid, adjust pH=9.5 with 0.5 mol / L NaOH solution, pass nitrogen gas for 30 minutes, heat up to 100 degrees Celsius, inject 0.2 ml of NaHTe solution, and react for 3 hours to obtain CdTe nanocrystalline crude solution. Add 5ml of isopropanol, centrifuge at 5000 rpm for 10 minutes to obtain a CdTe nanocrystal precipitate, redissolve in 100ml of water to obtain a CdTe nanocrystal solution;
[0023] (3) Polyacrylamine solution preparation
[0024] 300 mg of polyacrylamine (molecular weight = 15000) was dissolved in 100 ml of water to obtain 2 × 10 -4 mol / L polypropylene amine solution;
[0025] (4) Sur...
Embodiment 2
[0028] (1). Preparation of potassium hydride telluride
[0029] 50.8 mg KBH 4 Put the solid and 63.8 mg of Te powder into a small flask, add 2 ml of water, and react at 20 degrees Celsius for 15 hours to obtain a KHTe solution for later use;
[0030] (2) Preparation of CdTe nanocrystal solution
[0031] 25.6 mg CdCl 2 Dissolve in 100 ml of water, add 0.018 ml of mercaptoacetic acid, adjust pH=8.5 with 0.5 mol / L NaOH solution, pass nitrogen gas for 30 minutes, heat up to 90 degrees Celsius, inject 0.3 ml of KHTe solution, and react for 10 hours to obtain CdTe quantum dot solution ; Add 8ml of isopropanol, centrifuge at 3500 rpm for 15 minutes to obtain a CdTe nanocrystal precipitate, redissolve it in 200ml of water to obtain a CdTe nanocrystal solution;
[0032] (3) Polyacrylamine solution preparation
[0033] 15 mg of polyacylamine (molecular weight = 30000) was dissolved in 100 ml of water to obtain 5 × 10 -6 mol / L polypropylene amine solution;
[0034] (4) Surface modi...
Embodiment 3
[0037] (1). Preparation of sodium telluride hydride:
[0038] 98 mg NaBH 4 Put the solid and 115.6 mg of Te powder into a small flask, add 3 ml of water, and react at 15 degrees Celsius for 11 hours to obtain a NaHTe solution for subsequent use;
[0039] (2) Preparation of CdTe nanocrystal solution
[0040] 25.0 mg CdCl 2Dissolve in 100 ml of water, add 0.02 ml of mercaptoacetic acid, adjust pH=10.5 with 0.5 mol / L NaOH solution, pass nitrogen gas for 30 minutes, heat up to 110 degrees Celsius, inject 0.2 ml of NaHTe solution, and react for 3.5 hours to obtain CdTe nanocrystalline crude Solution preparation: add 2ml of isopropanol, centrifuge at 15000 rpm for 30 minutes to obtain CdTe nanocrystal precipitate, redissolve in 50ml of water to obtain CdTe nanocrystal solution;
[0041] (3) Polyacrylamine solution preparation
[0042] 3 mg of polyacrylamine (molecular weight = 300000) was dissolved in 1000 ml of water to obtain 1 × 10 -8 mol / L polypropylene amine solution;
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