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A kind of hgte/znse core-shell quantum dot and its preparation method and application

A core-shell quantum dot, glutathione technology, applied in chemical instruments and methods, measuring devices, pharmaceutical formulations, etc., can solve the problems of environmental and biological side effects, limited practical application of materials, and high toxicity of nanomaterials, etc. To achieve the effects of improved environmental friendliness and biocompatibility, simple and easy preparation method, and stable luminescence performance

Active Publication Date: 2022-07-15
河南省疾病预防控制中心
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Problems solved by technology

However, when the HgTe / CdS quantum dots are heated at 100 °C, the maximum fluorescence emission peak of the quantum dot system moves from 1050 nm to 1500 nm very quickly (3 minutes), and the quantum yield continues to decrease, which seriously limits the further development of this material. practical application
In addition, whether it is HgTe quantum dots or HgTe / CdS core-shell quantum dots, the materials used are highly toxic Hg and Cd heavy metal elements, and the synthetic nanomaterials are highly toxic, which is harmful to the environment in the process of photoelectric materials and animal imaging. cause severe toxic side effects to organisms

Method used

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  • A kind of hgte/znse core-shell quantum dot and its preparation method and application
  • A kind of hgte/znse core-shell quantum dot and its preparation method and application
  • A kind of hgte/znse core-shell quantum dot and its preparation method and application

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Embodiment 1

[0038] A HgTe / ZnSe core-shell quantum dot with stable near-infrared fluorescence and good biocompatibility, the structure of the core-shell quantum dot is as follows:

[0039] .

[0040] The preparation method of the above-mentioned HgTe / ZnSe core-shell quantum dots (its synthesis process flow see Figure 9 ), which includes the following steps:

[0041] 1) Preparation of GSH-Hg precursor solution: add 200 mL of ultrapure water to the three-necked flask at I in the figure, add 1.8 g (5.86 mmol) of GSH solid, stir to dissolve it completely, sodium hydroxide (0.5 M) Adjust the pH value of the solution to 11.2, add 2.0 mL dropwise under magnetic stirring to a concentration of 1 mol L -1 Hg(ClO 4 ) 2 (2.0 mmol) aqueous solution and mixed uniformly to obtain a transparent and clear GSH-Hg precursor solution. 2 Airflow (over 20 min) to deoxygenate the GSH-Hg precursor solution;

[0042] 2) Preparation of H 2 Te gas: add ethanol and water to the single-necked flask at II in...

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Abstract

The invention belongs to the field of synthesis and application of functional nanomaterials, and in particular relates to a preparation method and optical application of a novel near-infrared mercury chalcogenide fluorescent quantum dot. The novel HgTe / ZnSe fluorescent nanocrystal synthesized by the invention has the following general formula: The glutathione-coordinated HgTe / ZnSe core-shell quantum dots of the present invention have stable near-infrared fluorescence emission and good biocompatibility, the fluorescence emission has stable optical properties, adjustable emission wavelength, high quantum yield and low toxicity It is suitable for the preparation of near-infrared optoelectronic devices and the fluorescence imaging of deep tissue in animals.

Description

technical field [0001] The invention belongs to the technical field of synthesis and biological application of novel nano-fluorescent materials, in particular to a HgTe / ZnSe core-shell nano-fluorescent quantum dot with high stable fluorescent emission and good biocompatibility, a preparation method and application thereof. Background technique [0002] Quantum dots, also known as semiconductor fluorescent nanocrystals, are mainly composed of II-VI group elements or III-V group elements with a particle size of less than 20 nanometers. Quantum dots have multiple effects such as size confinement, quantum confinement, macroscopic quantum tunneling, and surface, and exhibit many optical and physical properties that are different from macroscopic substances. Functional materials and other fields have extremely broad application prospects. Due to the quantum confinement of electrons and holes, the continuous energy band structure becomes a discrete energy level structure with mole...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/89C09K11/02G01N21/64B82Y30/00B82Y20/00A61K49/00
CPCC09K11/892C09K11/025C09K11/02B82Y20/00B82Y30/00G01N21/6428A61K49/0019
Inventor 张文豪刘吉起袁鹏樊金星张叶岳思宁
Owner 河南省疾病预防控制中心
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