Silver composite chiral quantum dot nanomaterial and preparation method thereof

A technology of nanomaterials and quantum dots, applied in the field of nanomaterials, to achieve the effect of wide application range, large development space and strong optical activity

Active Publication Date: 2014-07-16
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current research is limited to the enhancement of the UV-vis absorption and fluorescence signals of quantum dots.

Method used

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  • Silver composite chiral quantum dot nanomaterial and preparation method thereof
  • Silver composite chiral quantum dot nanomaterial and preparation method thereof
  • Silver composite chiral quantum dot nanomaterial and preparation method thereof

Examples

Experimental program
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Effect test

preparation example 1

[0057] The preparation method of chiral quantum dot I comprises the steps:

[0058] (1) Dissolve 0.35g cadmium perchlorate (cadmium ion complexing agent) and 0.1gD-glutathione (chiral biomolecule) in 60mL water, adjust the pH value to 9.0 to obtain a solution; The molar ratio of agent and chiral biomolecule is 1:2;

[0059] (2) Place the solution obtained in step (1) under an inert atmosphere, let it stand for 30 minutes, and then heat it up to 90°C for 20 hours to grow cadmium sulfide, and then obtain D-glutathione-stabilized chiral cadmium sulfide quantum Points, chiral quantum dots I (D-cadmium sulfide chiral quantum dots).

preparation example 2

[0061] The preparation method of chiral quantum dot II comprises the steps:

[0062] The only difference from Preparation Example 1 is that by replacing D-glutathione with L-glutathione in equal amounts, L-glutathione-stabilized chiral cadmium sulfide quantum dots, that is, chiral quantum dots can be obtained. II (L-cadmium sulfide chiral quantum dots).

[0063] Characterize the optical activity of the chiral quantum dot I obtained in Preparation Example 1 and the chiral quantum dot II obtained in Preparation Example 2 by circular dichroism spectroscopy;

[0064] in, figure 1 Circular dichroism spectra of D-cadmium sulfide chiral quantum dots and L-cadmium sulfide chiral quantum dots; figure 1 It can be seen that the circular dichroism spectra of D-cadmium sulfide chiral quantum dots and L-cadmium sulfide chiral quantum dots are mirror-image symmetrical, and have obvious optical activity;

[0065] figure 2 It is the transmission electron micrograph of L-cadmium sulfide ch...

preparation example 3

[0067] The preparation method of chiral quantum dot I comprises the steps:

[0068] (1) Dissolve 1 mmol cadmium chloride (cadmium ion complexing agent) and 2 mmol D-penicillin amine (chiral biomolecule) in 66.67 mL dimethyl sulfoxide, adjust the pH value to 8.0, and obtain a solution;

[0069] (2) Place the solution obtained in step (1) under an inert atmosphere, let it stand for 10 minutes, then heat it up to 150°C for 0.25 hours to grow cadmium sulfide, and then obtain D-penicillinamine-stabilized chiral cadmium sulfide quantum dots , that is, chiral quantum dots III.

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Abstract

The invention relates to a silver composite chiral quantum dot nanomaterial. The silver composite chiral quantum dot nanomaterial is a silver nanoparticle coated with chiral quantum dots. The invention also discloses a preparation method. The method comprises the following steps: (1) preparing the chiral quantum dot nanoparticle with negative charges; (2) preparing a silver nanoparticle with positive charges; (3) self-assembling the chiral quantum dot nanoparticle with the negative charges obtained in the step (1) and the silver nanoparticle with the positive charges obtained in the step (2), so as to obtain the silver composite chiral quantum dot nanomaterial. The silver composite chiral quantum dot nanomaterial provided by the invention has strong optical activity, and the prepared silver composite chiral quantum dot nanomaterial is simple in preparation method, low in cost, diverse in component and property, wide in application range, and large in development space.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a silver-composite chiral quantum dot nanomaterial and a preparation method thereof. The silver-compound chiral quantum dot nanomaterial has optical activity. Background technique [0002] Quantum dots are semiconductor nanoparticles whose size is smaller than their Bohr radius. Generally speaking, when the size of quantum dots is less than 5nm, the quantum confinement effect can be reflected. This special physical property makes quantum dots widely used in the fields of optics, biomedicine, electronics and energy. [0003] Currently, some research groups have proposed that chiral molecules can be used to induce the optical activity of quantum dots (Zhou Yunlong, Zhu Zhening, Huang Wenxiao, Liu Wenjing, Wu Shaojue, Liu Xuefeng, Gao Yan, Zhang Wei, Tang Zhiyong. Optical Coupling Between Chiral Biomolecules and Semiconductor Nanoparticles: Size-Dependent Circular Dic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/58C09K11/56C09K11/02B82Y30/00B82Y40/00
Inventor 朱哲凝刘文靓唐智勇
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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