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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 condu

Method used

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  • Preparation method for chiral CdSe quantum dot
  • Preparation method for chiral CdSe quantum dot
  • Preparation method for chiral CdSe quantum dot

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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 ...

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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

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Application Information

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IPC IPC(8): C09K11/88B82Y20/00
CPCC09K11/883B82Y20/00
Inventor 赵丹马诗瑶郝健
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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