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Preparation method of water-soluble Zn-doped CdTe quantum dot CdxZn1-xTe

A cdxzn1-xte, water-soluble technology, applied in the field of preparation of water-soluble Zn-doped CdTe quantum dots CdxZn1-xTe, can solve the problems of difficult to scale up, limited preparation amount of reflux method, etc., to achieve reduced content and toxicity, excellent photostability performance and operational safety

Inactive Publication Date: 2012-12-12
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CdTe / ZnTe quantum dots (Wing-Cheung Law, et. Small, 2009, 5, No.11, 1302-1310) and doped quantum dots (Wanwan Li, et. J.Mater.Chem., 2010,20,2133-2138), but the amount of preparation of reflux method is limited, it is difficult to enlarge; there is no hydrothermal method so far to prepare water-soluble Zn-doped CdTe quantum dots Cd x Zn 1-x Te's report

Method used

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  • Preparation method of water-soluble Zn-doped CdTe quantum dot CdxZn1-xTe
  • Preparation method of water-soluble Zn-doped CdTe quantum dot CdxZn1-xTe
  • Preparation method of water-soluble Zn-doped CdTe quantum dot CdxZn1-xTe

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Embodiment 1

[0026] A water-soluble Zn-doped CdTe quantum dot Cd x Zn 1-x The preparation method of Te, its step is as follows:

[0027] 1. Preparation of sodium telluride hydride:

[0028] 0.5mmol NaBH 4 Put the solid and 0.2mmol Te powder into a 5mL single-necked flask, add 1mL ultrapure water, and stir and react at 10°C for 5h to obtain a NaHTe solution for later use;

[0029] 2. Cd x Zn 1-x Preparation of Te quantum dots

[0030] 0.25mmol CdCl 2 , 0.25 mmol ZnCl 2 and 0.6mmol mercaptopropionic acid in a three-necked flask, add 40mL of ultrapure water, adjust pH=7.5 with 1mol / L NaOH solution, pass argon for 20min, inject NaHTe solution containing 0.08mmol NaHTe, mix well and transfer to Heat up the temperature in the hydrothermal reactor to 200°C and react for 50min to obtain Cd x Zn 1-x Te quantum dot solution.

[0031] 3. Add 3 times the volume of isopropanol for precipitation, centrifuge to separate the supernatant, then wash with isopropanol and centrifuge 3 times to obta...

Embodiment 2

[0033] A water-soluble Zn-doped CdTe quantum dot Cd x Zn 1-x The preparation method of Te, its step is as follows:

[0034] 1. Preparation of sodium telluride hydride:

[0035] 1.2mmol NaBH4 Put the solid and 0.6mmol Te powder into a 10mL single-necked flask, add 3mL ultrapure water, and stir and react at 50°C for 6h to obtain a NaHTe solution for later use;

[0036] 2. Cd x Zn 1-x Preparation of Te quantum dots

[0037] 1mmol CdCl 2 , 2 mmol ZnCl 2 and 3.6mmol mercaptoacetic acid in a three-necked flask, add 160mL ultrapure water, adjust pH=9 with 1mol / L NaOH solution, pass argon for 30min, inject NaHTe solution containing 0.3mmol NaHTe, mix well and transfer to water Heat up the temperature in the reaction kettle to 180°C and react for 50min to obtain Cd x Zn 1-x Te quantum dot solution a;

[0038] The rest of the conditions are the same, only the reaction time is changed to 58min, then the quantum dot solution b is obtained;

[0039] The rest of the conditions ar...

Embodiment 3

[0044] A water-soluble Zn-doped CdTe quantum dot Cd x Zn 1-x The preparation method of Te, its step is as follows:

[0045] 1. Preparation of potassium hydride telluride:

[0046] 3mmol KBH 4 Put the solid and 1mmol Te powder into a 5mL single-necked flask, add 2mL ultrapure water, and stir and react at 0°C for 20h to obtain a KHTe solution for later use;

[0047] 2. Cd x Zn 1-x Preparation of Te quantum dots

[0048] 0.4mmol CdCl 2 , 1.2 mmol ZnCl 2 Put 4mmol N-acetyl-L-cysteine ​​in a three-neck flask, add 400mL ultrapure water, adjust pH=10 with 1mol / L NaOH solution, pass argon gas for 40min, inject KHTe solution containing 0.13mmol KHTe , mixed evenly, transferred to a hydrothermal reaction kettle and heated to 170°C, and reacted for 120min to obtain Cd x Zn 1-x Te quantum dot solution;

[0049] 3. Add 3 times the volume of isopropanol for precipitation, centrifuge to separate the supernatant, then wash with isopropanol and centrifuge 3 times to obtain a solid p...

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Abstract

The invention discloses a preparation method of a water-soluble Zn-doped CdTe quantum dot CdxZn1-xTe. The preparation method comprises the following steps of: mixing a cadmium salt and a zinc salt or oxides of cadmium and zinc with a water-soluble mercapto-compound in a water phase; injecting prepared tellurium hydride to obtain a CdxZn1-xTe precursor solution; putting the solution into a hydro-thermal reaction kettle; and reacting to obtain a CdxZn1-xTe fluorescent quantum dot. The method is implemented in a water phase, is safe, easy and convenient for operation, is easy for mass productionand is environmentally friendly; the obtained product has high performance; even Zn doping molar percentage (i.e., the molar percentage of Zn to Cd in CdxZn1-xTe) surpasses 70 percent, the obtained quantum dot has high fluorescent quantum yield and high light stability and can be widely applied to photoelectric conversion, luminous and display materials, biological detection and targeting tracing; and the content and the toxicity of Cd are greatly lowered.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation technology and biological analysis and detection technology, in particular to a water-soluble Zn-doped CdTe quantum dot Cd x Zn 1-x Te preparation method. Background technique [0002] Quantum dots are quasi-zero-dimensional nanomaterials composed of II-VI or III-V elements with a diameter of 1-10 nm. Since the quantum dot radius is smaller than or close to the exciton Bohr radius, it has a special quantum size effect and surface effect. Compared with organic fluorescent dyes or lanthanide complexes, quantum dots have very good photochemical properties: the excitation of quantum dots The spectrum is wide and continuously distributed, and the half-maximum width of the emission spectrum is narrow and symmetrically distributed. The emission wavelength can be adjusted by controlling its particle size and composition, and it is easy to realize one-element excitation and multi-element emission....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/88
Inventor 何治柯方旸
Owner WUHAN UNIV
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