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Water-phase synthesis method for water-soluble CdZnTe ternary quantum dots

A ternary quantum dot, water-soluble technology, applied in the synthesis field of nanotechnology, can solve problems such as performance impact, and achieve the effects of mild conditions, simple reaction steps and convenient operation.

Inactive Publication Date: 2008-08-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But a significant disadvantage of this method is that the preparation of the ternary quantum dots needs to be carried out in two stages, that is, the CdZnSe quantum dots need to be further synthesized on the basis of preparing ZnSe quantum dots, and the ZnSe quantum dots obtained in the first stage The performance will have an impact on the performance of the further obtained CdZnSe quantum dots, such as the fluorescence quantum efficiency of ZnSe quantum dots, the full width at half maximum of the fluorescence emission peak, and its possible defects, etc.

Method used

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  • Water-phase synthesis method for water-soluble CdZnTe ternary quantum dots
  • Water-phase synthesis method for water-soluble CdZnTe ternary quantum dots

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (a) Synthetic sodium tellurium hydride NaHTe solution

[0026] Combine 20 mg Te powder and 13 mg sodium borohydride NaBH 4 The powders are mixed, put into a 5 ml sample bottle and 1 ml deionized water is added, and then the reaction bottle is placed at a temperature of 30°C for 2 hours to react to obtain a NaHTe solution.

[0027] (b) Preparation of Cd 2+ , Zn 2+ Precursor solution

[0028] Add 80 ml of deionized water to the three-necked flask, and then add 73 mg of CdCl 2 ·2.5H 2 O, 109 mg ZnCl 2 And 860 mg of glutathione to get (Cd 2+ +Zn 2+ ) / GSH molar ratio is 1:2.5, Cd 2+ / Zn 2+ Molar ratio 2:5, Cd 2+ Cd at a concentration of 4 mmol / L 2+ , Zn 2+ Precursor solution, and adjust the pH of the solution to 9.0, and then bubbling nitrogen into the solution for 30 minutes.

[0029] (c) Preparation of CdZnTe quantum dots by aqueous solution method

[0030] Inject the NaHTe prepared above into the Cd prepared above 2+ / Zn 2+ -GSH precursor solution, get (Cd 2+ +Zn 2+ ) / Te 2- T...

Embodiment 2

[0032] (a) Synthetic sodium tellurium hydride NaHTe solution

[0033] Combine 20 mg Te powder and 13 mg sodium borohydride NaBH 4 The powders are mixed, put into a 5 ml sample bottle and 1 ml deionized water is added, and then the reaction bottle is placed at a temperature of 30°C for 2 hours to react to obtain a NaHTe solution.

[0034] (b) Preparation of Cd 2+ , Zn 2+ Precursor solution

[0035] Add 57 ml of deionized water to the three-necked flask, and then add 52 mg of CdCl 2 ·2.5H2 O, 78 mg ZnCl 2 And 615 mg of glutathione to obtain (Cd 2+ +Zn 2+ ) / GSH molar ratio is 1:2.5, Cd 2+ / Zn 2+ Molar ratio 2:5, Cd 2+ Cd at a concentration of 4 mmol / L 2+ , Zn 2+ Precursor solution, and adjust the pH of the solution

[0036] 9.0, then let nitrogen gas through the solution for 30 minutes.

[0037] (c) Preparation of CdZnTe quantum dots by aqueous solution method

[0038] Inject the NaHTe prepared above into the Cd prepared above 2+ / Zn 2+ -GSH precursor solution, get (Cd 2+ +Zn 2+ ) / Te...

Embodiment 3

[0040] (a) Synthetic sodium tellurium hydride NaHTe solution

[0041] Combine 20 mg Te powder and 13 mg sodium borohydride NaBH 4 The powders are mixed, put into a 5 ml sample bottle and 1 ml deionized water is added, and then the reaction bottle is placed at a temperature of 30°C for 2 hours to react to obtain a NaHTe solution.

[0042] (b) Preparation of Cd 2+ , Zn 2+ Precursor solution

[0043] Add 115 ml of deionized water into the three-necked flask, and then add 104 mg of CdCl 2 ·2.5H 2 O, 46 mg ZnCl 2 And 615 mg of glutathione to obtain (Cd 2+ +Zn 2+ ) / GSH molar ratio is 1:2.5, Cd 2+ / Zn 2+ Molar ratio 4:3, Cd 2+ Cd at a concentration of 4 mmol / L 2+ , Zn 2+ Precursor solution, and adjust the pH of the solution to 9.0, and then bubbling nitrogen into the solution for 30 minutes.

[0044] (c) Preparation of CdZnTe quantum dots by aqueous solution method

[0045] Inject the NaHTe prepared above into the Cd prepared above 2+ / Zn 2+ -GSH precursor solution, get (Cd 2+ +Zn 2+ ) / T...

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Abstract

The invention relates to an aqueous phase synthesis process of water-soluble CdZnTe ternary quantum dots in the nano technology field. The invention chooses oxide of cadmium salt or cadmium as cadmium source, oxide of zinc salt or zinc as zinc source and sodium hydrogen telluride formed by tellurium powder and sodium borohydride, uses sulfhydryl group compound as stabilizer, and prepares the mixing solution of Cd, Zn precursor solution under the protection of nitrogen, and obtains water-soluble CdZnTe ternary quantum dots through reacting after adding sodium hydrogen telluride under the condition of heating reflux. The sulfhydryl peptides substance is used as stabilizer in the invention, thereby obtaining the CdZnTe ternary quantum dots which have excellent stability and high fluorescent property. The invention can obtain water-soluble CdZnTe ternary quantum dots which have excellent dispersibility, uniform grain size and favorable fluorescent property under the mild reaction condition through adopting water solution preparation process and heating with oil bath companying with fully agitation.

Description

Technical field [0001] The invention relates to a synthesis method in the field of nanotechnology, in particular to a water-phase synthesis method of water-soluble CdZnTe ternary quantum dots. Background technique [0002] Due to its unique quantum size effect and surface effect, semiconductor quantum dots have many advantages over traditional fluorescent dye molecules used as markers: broad excitation light spectrum, narrow emission spectrum, and symmetry. The fluorescence emission wavelength can be changed by changing the quantum dot’s The size and composition are adjusted so that quantum dots of different sizes can be excited by a single wavelength of light to emit fluorescence of different colors, which can be used for multi-color labeling of multi-target molecules. In addition, quantum dots have high luminous intensity and good photochemical stability, so they are not only widely used in optoelectronic information fields such as optoelectronic devices, light-emitting diodes,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/54
Inventor 孙康李万万刘洁
Owner SHANGHAI JIAO TONG UNIV
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