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Single or multicomponent organic acid surface finished II-VI group of semiconductor quantum point of sulfhydryl, and method for preparing the same

A multi-component organic acid and surface modification technology, which is applied in the direction of manipulating single atoms, nanostructure manufacturing, nanotechnology, etc., can solve the problem of low quantum yield and achieve the effect of optimizing surface properties, excellent dispersion, and low toxicity

Inactive Publication Date: 2009-08-19
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So, when the electron traps in the semiconductor are deeper, the quantum yield will be lower

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: The specific steps are as follows:

[0018] 1. Put 1.25mmol CdCl 2 ·2.5H 2 O was dissolved in 100ml of water, 3mmol of dimercaptosuccinic acid was added, and the pH value was adjusted to 9 with 1M NaOH under stirring to obtain solution A, which was transferred to a suitable three-necked flask.

[0019] 2. Put 0.25mmol of tellurium powder and 0.75mmol of sodium borohydride into a three-necked flask, add argon for a period of time, and add 0.2ml of water, react at room temperature for 30 minutes, the solution will precipitate a white precipitate and appear pink (the whole process has been slowly protected Gas) to obtain a sodium tellurium hydride solution, called solution B; when the reaction tends to be complete, immerse the three-necked flask in a mixture of ice and water to keep it at a constant temperature.

[0020] 3. In the above solution B, drop sulfuric acid to control the concentration of sulfuric acid and the dropping speed to stabilize the reaction an...

Embodiment 2

[0023] Embodiment 2: The specific steps are as follows:

[0024] 1. Dissolve 1.25mmol of cadmium acetate in 100ml of water and add 3.5mmol of cysteine. Adjust the pH to 9 with 1M NaOH under stirring to obtain solution A, which is transferred to a suitable three-necked flask.

[0025] 2. Put 0.25mmol selenium powder and 0.75mmol sodium borohydride into a three-necked flask, add argon for a period of time, and add 0.2ml of water, react at room temperature for 30 minutes, the solution will precipitate a white precipitate and appear pink (the whole process has been slowly protected Gas) to obtain a sodium selenium hydride solution, called solution B; when the reaction tends to be complete, immerse the three-necked flask in a mixture of ice and water to keep it constant.

[0026] 3. In the above solution B, drop sulfuric acid to control the concentration of sulfuric acid and the dropping speed to stabilize the reaction and generate gas C.

[0027] 4. The above gas C, namely H 2 Se, und...

Embodiment 3

[0029] Embodiment 3: The specific steps are as follows:

[0030] 1. Put 1.25mmolZnCl 2 Dissolve in 100ml of water and add 2mmol of dihydrolipoic acid. Adjust the pH to 13 with 1M NaOH under stirring to obtain solution A, which is transferred to a suitable three-necked flask.

[0031] 2. The sodium sulfide and sulfuric acid are reacted, and the concentration of sulfuric acid and the rate of dropping are controlled to stabilize the reaction and obtain gas C.

[0032] 4. Put the above gas C, which is H 2 S, under the protection of argon gas, pass into solution A with a catheter until the solution turns brown. This solution is the precursor solution, and the precursor solution has not yet fluoresced.

[0033] 5. The above-mentioned precursor solution is rapidly heated to reflux for 48 hours in a protective atmosphere to prepare ZnS quantum dots. The particle size of the quantum dots can be controlled to 2.5-5.0nm, the fluorescence range is 550-650nm, and the quantum efficiency is 40 %...

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Abstract

The invention relates to sulphydryl single-element or multi-element organic acid surface-modified No.2-No.6 semiconductor quantum dots and a preparation method thereof. The method comprises the following steps of preparation of a precursor solution, preparation of quantum dots, and the like. The sulphydryl single-element or multi-element organic acid surface-modified No.2-No.6 semiconductor quantum dots are the quantum dots formed by CdX (X=S, Se, Te) or ZnX (X=S, Se, Te) which is coated by sulphydryl single-element (or multi-element) organic acid, wherein the mol ratio of the sulphydryl single-element (or multi-element) organic acid to the CdX or the ZnX is between 2:1 and 3:1; and particle diameter of the quantum dots is between 2.0 and 6.0 nanometers. The invention takes gas as a tellurium (or sulfur or selenium) source, and reduces impurity compositions of the precursor solution by introducing H2X (X=S, Se, Te); and due to the superior hydrophilicity of the sulphydryl single-element (or multi-element) organic acid, the prepared No.2-No.6 semiconductor CdX (X=S, Se, Te) and ZnX (X=S, Se, Te) quantum dots,, and the like have good dispersity and wide fluorescent range, and have the quantum yield as high as more than 80 percent. Simultaneously, the quantum dots have small toxicity, good biocompatibility and easy operation, and can be used for medicament tracking, diagnostic marking, and the like.

Description

Technical field [0001] The invention relates to a II-VI group semiconductor quantum dot and a preparation method thereof, in particular to a II-VI group semiconductor quantum dot surface-modified by a mercapto group single or multiple organic acid and a preparation method thereof. Background technique [0002] With the rapid development of nanoscience and technology, semiconductor nanocrystals are increasingly showing great academic value and good commercial prospects due to their unique physical and chemical properties, especially in optics and biology. Many high-level international journals such as Science (such as Science 289, 1757-1760 (2000), etc.) and Nature have repeatedly reported on the synthesis methods, physical and chemical characteristics of semiconductor nanocrystals, and their applications in the fields of biomedicine and optoelectronics. Aspects of the application. Companies that develop semiconductor nanocrystal biolabeled fluorescent probes have been established...

Claims

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Application Information

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IPC IPC(8): B82B1/00B82B3/00
Inventor 俞本伟沈悦张建成颜浩
Owner SHANGHAI UNIV
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