Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method for chiral CdSe quantum dot

A technology of quantum dots and quantum dot solution, which is applied in the field of synthesizing chiral CdSe quantum dots wrapped with various ligands, which can solve the problems of few types of chiral quantum dots and unfavorable chirality theory research.

Inactive Publication Date: 2018-07-06
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that there are few types of chiral quantum dots at present, which is not conducive to the theoretical research of chirality and its application in the fields of biochemical detection, asymmetric synthesis and medical diagnosis.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for chiral CdSe quantum dot
  • Preparation method for chiral CdSe quantum dot
  • Preparation method for chiral CdSe quantum dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation method of the chiral CdSe quantum dot of the present embodiment, its specific steps are as follows:

[0040] (1) First, 30 mg of selenium powder and 60 mg of sodium borohydride were dissolved in 3 mL of ultrapure water to prepare a sodium selenium hydride solution, and the freshly prepared sodium selenium hydride solution was preserved at 4° C. for subsequent use;

[0041] (2) Cadmium chloride, cysteine ​​and penicillamine were dissolved in ultrapure water and vigorously stirred for 5 min to obtain a precursor solution. Then adjust the pH value of the precursor solution to 10 with 1mol / L sodium hydroxide. Under the protection of nitrogen, the precursor solution was placed in ice water and stirred vigorously for 5 minutes;

[0042] (3) Inject the sodium selenium hydride solution prepared in (1) into the precursor solution in (2) and stir vigorously for 5 min. Finally, the mixed solution was transferred to a hydrothermal reaction kettle, placed in an ele...

Embodiment 2

[0047] The preparation method of the chiral CdSe quantum dot of the present embodiment, its specific steps are as follows:

[0048] (1) First, 30 mg of selenium powder and 60 mg of sodium borohydride were dissolved in 3 mL of ultrapure water to prepare a sodium selenium hydride solution, and the freshly prepared sodium selenium hydride solution was preserved at 4° C. for subsequent use;

[0049] (2) Dissolve cadmium chloride, cysteine ​​and penicillamine in ultrapure water and stir vigorously for 5 min, then adjust the pH of the precursor solution to 10 with 1mol / L sodium hydroxide. Under the protection of argon, the precursor solution was placed in ice water and stirred vigorously for 5min, the molar ratio of Cd:Se:total ligand was 1:0.5:1.8, and the molar ratio of cysteine ​​and penicillamine was 1: 1 to 3, the molar concentration of cadmium chloride is 5mmol / L.

[0050] (3) Inject the sodium selenium hydride solution prepared in (1) into the precursor solution in (2) and s...

Embodiment 3

[0053] The preparation method of the chiral CdSe quantum dot of the present embodiment, its specific steps are as follows:

[0054] (1) First, 30 mg of selenium powder and 10 mg of sodium borohydride were dissolved in 3 mL of ultrapure water to prepare a sodium selenium hydride solution, and the freshly prepared sodium selenium hydride solution was preserved at 4° C. for subsequent use;

[0055] (2) Dissolve cadmium chloride, N-acetyl-cysteine ​​and N-isobutyryl-cysteine ​​in ultrapure water and stir vigorously for 120min, then adjust the pH value of the precursor solution with 1mol / L ammonia water for 12. Under the protection of nitrogen, the precursor solution was placed in ice water and stirred vigorously for 120min, the molar ratio of Cd:Se:N-acetyl-cysteine:N-isobutyryl-cysteine ​​was 1:0.3:0.25 :0.25, the molar concentration of cadmium chloride is 1mmol / L.

[0056] (3) A certain amount of sodium selenium hydride solution prepared in (1) was injected into the precursor ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a preparation method for a chiral CdSe quantum dot. The preparation method comprises the following steps: (1) preparing a sodium hydrogen selenide aqueous solution, and carrying out preservation at 4 DEG C or below; (2) dissolving cadmium chloride and a ligand in water, adjusting a pH value of an obtained mixture to 7 to 12 so as to obtain a precursor solution, and subjecting the precursor solution to stirring in an ice bath under the protection of inert gas, wherein the ligand is a combination of two or more selected from the group consisting of penicillamine, cysteine, N-acetyl-cysteine, glutathione or N-isobutyryl-cysteine; and (3) injecting the sodium hydrogen selenide aqueous solution prepared in the step (1) into the precursor solution obtained in the step (2), carrying out heating to 70 to 220 DEG C for 10 to 120 min, and carrying out cooling to a room temperature so as to obtain a chiral CdSe quantum dot solution. The quantum dot provided by the invention can be extensively applied to the fields of enantiomer recognition and separation, nanometer equipment, chiral sensors, asymmetric catalysis, etc.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of nanometer materials, and specifically discloses a simple method for synthesizing chiral CdSe quantum dots wrapped by various ligands, which exhibit strong circular dichroism in the range of 200-475nm. The optical isomerism of quantum dots can be effectively tuned by mixing chiral ligands with different structures or different stereochemistry. Background technique [0002] Chirality has been involved in many practical and fundamental studies in chemical, biological and medical sciences, and researchers have found that it is an important factor affecting structure-activity relationships. The Schaaff research group discovered for the first time that inorganic nanocrystals have chirality, and then researchers successively discovered that gold and silver nanoclusters and quantum dots wrapped by chiral molecules also have chirality. These achievements are of great importance to the develo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09K11/88B82Y20/00
CPCC09K11/883B82Y20/00
Inventor 赵丹马诗瑶郝健
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com