Preparation method of quantum dot solution with core-shell structure
A quantum dot solution, core-shell structure technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of inability to directly use the biological field, difficult to obtain size quantum dots, low quantum yield, etc., to achieve a wide range of sizes, Reproducible and easy-to-use results
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Embodiment 1
[0022] A preparation method of a core-shell structure quantum dot solution, the steps are as follows:
[0023] (1) Synthesis of CdTe quantum dot solution by aqueous phase method
[0024] Referring to the published literature Yang YH (Advanced Material, 2005, 17) or Gaponik, N (Journal of Physical Chemistry B, 2002, 106), the specific steps are:
[0025] Take 36.4mg NaBH 4 and 26.7mg of Te powder, add 1.5ml of double distilled water, and seal the reaction until the tellurium powder disappears completely, and the solution is light purple, which is the prepared NaHTe solution. Take 160mL of 0.026mol / L CdCl 2 solution, add 140 μL thioglycerol, 27.5 μL thioglycolic acid (TGA), and adjust the pH value of the solution to 11.2 with 1mol / L NaOH solution, heat the solution for 30 min in an oxygen-free environment, and quickly add freshly prepared NaHTe solution, and reacted at 97° C. for 1 h to obtain a CdTe quantum dot solution.
[0026] (2) The first step is to add NaOH to synthes...
Embodiment 2
[0032] A preparation method of a core-shell structure quantum dot solution, the steps are as follows:
[0033] (1) Synthesis of CdTe quantum dot solution by aqueous phase method
[0034] This step is the same as in Example 1.
[0035] (2) The first step is to add NaOH lye to synthesize quantum dots with core-shell structure
[0036] Take 1 mL of the newly synthesized CdTe quantum dot solution, add 1 mL of 0.2 mol / L NaOH solution, and react in a water bath at 96 °C for 4.5 h. At this time, the fluorescence emission wavelength of the quantum dot is 570nm, the size is about 3.7nm, and the quantum yield is 60%. The calculation of the quantum yield refers to the Brouwer method in 2011, using Rhodamine B as a reference, and the highest measured quantum dot The yield is 2-3 times that of the original quantum dot solution.
[0037] (3) Adding NaOH lye in two steps to synthesize quantum dots with core-shell structure
[0038] Take 1mL of 0.8mol / L NaOH solution and add it to the qua...
Embodiment 3
[0040] Jiang Guohui (Materials and Structure, 2012, 19) prepared CdSe quantum dot solution and other methods. Press CdCl 2 The molar ratio of thioglycolic acid and the stabilizer is 1:2.5, and the pH is adjusted to 10. KBH 4Add Se to deionized water at a molar ratio of 4:1, nitrogen protection, magnetic stirring, and reflux at 50°C for 20 min to obtain a clear sodium selenium hydride (KHSe) solution. To the prepared CdCl 2 Nitrogen was passed through the solution for 5-10 minutes, and then the KHSe solution was quickly injected into CdCl 2 In the solution, reflux reaction at 90° C. to obtain a quantum dot solution. The other steps of the lye method synthesis are the same as in Example 1 twice.
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