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Method for synthesizing Zn doped with CdTe quantum dots in one step

A technology of quantum dots and quantum dot solutions, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of unsuitability for large-scale production, easy oxidation of Te precursors, and long time required for quantum dots, so as to reduce the content of quantum dots. , Excellent optical properties, the effect of shortening the reaction time

Active Publication Date: 2013-04-24
WUHAN UNIV
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Problems solved by technology

However, this method is more complicated to operate, and Te powder needs to be reduced separately, and the Te precursor is easily oxidized during the reduction process. Therefore, in recent years, researchers have tried to find a stable Te source to synthesize quantum dots.
CdTe quantum dots (Suli Wu, et. J. Mater. Chem., 2012, 22, 14573-14578) and core-shell structure CdTe / CdS quantum dots (Li-Na Chen, et.Chem.Comm., 2012, 48, 4971-4973), but the reflux method takes too long to synthesize quantum dots, the operation is cumbersome, and it is not suitable for large-scale production; on the basis of previous work, we use tellurium One-step synthesis of Zn-doped CdTe quantum dots by hydrothermal method using sodium nitrate and tellurium dioxide as Te source

Method used

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  • Method for synthesizing Zn doped with CdTe quantum dots in one step
  • Method for synthesizing Zn doped with CdTe quantum dots in one step
  • Method for synthesizing Zn doped with CdTe quantum dots in one step

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for synthesizing Zn-doped CdTe quantum dots in one step, the steps are as follows:

[0031] 1. Add 57mg CdCl 2 , 34mg ZnCl 2 and 83mg of thioglycolic acid were added to a three-necked flask, then 40mL of ultrapure water was added, and the pH was adjusted to 8.5 with 1mol / L NaOH solution, and then 6mg of NaOH was added 2 TeO 3 and 2 mg NaBH 4 , stirred and mixed, transferred to a hydrothermal reaction kettle, and then put the hydrothermal reaction kettle into an oven with a temperature set at 200 ° C for 45 minutes to obtain a Zn-doped CdTe quantum dot solution;

[0032] 2. Add isopropanol 3 times its volume to the quantum dot solution obtained in step 1 for precipitation, and centrifuge to separate the supernatant to obtain a solid precipitate;

[0033] After dissolving the obtained solid precipitate with distilled water, add 3 times its volume of isopropanol to the obtained quantum dot solution for precipitation, and the obtained solid precipitate is treat...

Embodiment 2

[0035] A method for synthesizing Zn-doped CdTe quantum dots in one step, the steps are as follows:

[0036] 1. Add 57mgCdCl 2 , 34mg ZnCl 2 and 147mg of N-acetyl-L-cysteine ​​were added to a three-necked flask, then 40mL of ultrapure water was added, the pH was adjusted to 8.0 with 1mol / L NaOH solution, and then 11mg of NaOH was added 2 TeO 3 and 5mg NaBH 4 , stirred and mixed, transferred to a hydrothermal reaction kettle, and then put the hydrothermal reaction kettle into an oven with a temperature set at 200 ° C for 31 minutes to obtain a Zn-doped CdTe quantum dot solution a;

[0037] The rest of the conditions are the same, only the reaction time is changed to 36min, then the quantum dot solution b is obtained;

[0038] The rest of the conditions are the same, only the reaction time is changed to 41min, then the quantum dot solution c is obtained;

[0039] The rest of the conditions are the same, only the reaction time is changed to 45min, then the quantum dot solution ...

Embodiment 3

[0044] A method for synthesizing Zn-doped CdTe quantum dots in one step, the steps are as follows:

[0045] 1. Add 57mg CdCl 2 , 68mg ZnCl 2 and 147mg of N-acetyl-L-cysteine ​​were added to a three-necked flask, then 40mL of ultrapure water was added, the pH was adjusted to 9.0 with 1mol / L NaOH solution, and then 17mg of K 2 TeO 3 and 7mg KBH 4 , stirred and mixed, transferred to a hydrothermal reaction kettle, and then put the hydrothermal reaction kettle into an oven with a temperature set at 200 ° C for 45 minutes to obtain a Zn-doped CdTe quantum dot solution;

[0046] 2. The subsequent processing method of the quantum dot solution obtained in step 1 is the same as that in Example 1. Finally, dry solid Zn-doped CdTe quantum dots are obtained, stored at 4° C., and reconfigured into an aqueous solution of the required concentration when used.

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Abstract

The invention discloses a method for synthesizing Zn doped with CdTe quantum dots in one step. The preparation method is simple, and time consumption is short. The method comprises the following steps: firstly mixing zinc salt with cadmium salt with aqueous-phase sulfhydryl compound in water liquor; adjusting the pH; adding tellurium source tellurite or tellurium dioxide liquor and reductant hydroboron; conveying the liquor into a hydrothermal reaction kettle; and heating for a segment of time to obtain the Zn doped with CdTe fluorescent quantum dots. The method adopts the tellurite or the tellurium dioxide liquor as the Te source, so that the operation steps are greatly simplified and the synthesis reaction time is reduced; as the synthesis is carried out in water phase, the method is easy to produce on large scales and is green and environmental-friendly; the quantum dots have high quantum yield and good optical properties, and the doped molar percentage of Zn in the quantum dots achieves 30%, and the actual input rate achieves 80%, so that the content of heavy metal Cd in the quantum dots is greatly reduced; and the method can be widely applied to biological detection, targeted tracer, photovoltaic conversion and lighting display material.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation technology and synthesis method, in particular to a method for synthesizing water-soluble Zn-doped CdTe quantum dots in one step by using tellurite or tellurium dioxide as a tellurium source. Background technique [0002] Quantum dots are quasi-zero-dimensional nanomaterials composed of II-VI or III-V elements with a diameter of 1-10nm. They have special quantum size effects, surface effects, confinement effects and special luminescence. nature. Quantum dots have a wide excitation spectrum and a narrow emission spectrum. The emission wavelength can be adjusted by controlling its particle size and composition, and it is easy to realize one-way excitation and multiple emission. In addition, quantum dots have high luminous intensity and good photochemical stability, so they are widely used in the fields of optoelectronic information and photonic devices. Attractive application pros...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 何治柯严季吉邢虎
Owner WUHAN UNIV
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