Water soluble quantum dot and preparation method thereof

A quantum dot and water-soluble technology, applied in chemical instruments and methods, nanotechnology, nano-optics, etc., can solve the problems of no reversible effect, poor photochemical stability of quantum dots, etc., and achieve good photochemical stability

Inactive Publication Date: 2017-04-26
TCL CORPORATION
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] In view of the above deficiencies in the prior art, the object of the present invention is to provide a water-soluble quantum dot and its preparation method, aiming to solve the problem that the quantum dot obtained by the existing method has poor photochemical stability after phase transfer and has no reversible effect. question

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  • Water soluble quantum dot and preparation method thereof

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Embodiment 1

[0030] 1. The preparation of oil-soluble red CdSe / ZnS quantum dots is as follows:

[0031] 1), cadmium oleate {Cd(OA) 2} with zinc oleate {Zn(OA) 2} Preparation of precursors:

[0032] Add cadmium oxide (CdO) 1mmol, zinc acetate {Zn (Ac) 2} 8mmol, 8ml of oleic acid (OA) and 15ml of octadecene (ODE), vacuumize at room temperature for 30mins, then heat to 180°C and exhaust argon for 60mins, then maintain 180°C for 30mins, cool to room temperature for later use.

[0033] 2), the preparation of selenium (Se) precursor:

[0034] Add 10mmol of Se powder to 10ml of trioctylphosphine (TOP), heat to 170°C for 30min, then cool down to 140°C.

[0035] 3) Preparation of sulfur (S-TOP) precursor:

[0036]Add 20mmol of S powder to 10ml of trioctylphosphine (TOP), heat to 170°C for 30min, then cool down to 140°C.

[0037] 4), the cadmium oleate {Cd(OA) in 1) 2} with zinc oleate {Zn(OA) 2}Heat the precursor to 300°C, extract 2ml of the selenium (Se) precursor in 2) and add it to the t...

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Abstract

The invention discloses a water soluble quantum dot and a preparation method thereof. The preparation method comprises the following steps: dropwise adding a stock solution of nucleic acid into an oil soluble quantum dot solution, after addition, stirring the solution for 20 to 40 minutes at a room temperature; then adding deionized water into the solution, stirring the solution for 5 to 20 minutes; and when layering of the solution appears, subjecting the solution to centrifugal separation to obtain the water soluble quantum dots. Cheap and commercialized nucleic acid and corresponding nucleosides are taken as the raw materials to carry out ligand exchange of quantum dots, the obtained water soluble quantum dot has a good chemical stability and also has a reversible effect, and namely, after the phase transition is realized through nucleic acid ligand exchange, the original ligand can be changed back relatively easily. The water soluble quantum dot can tolerate some extreme conditions such as pH range (3-13), sodium salts (NaCl) concentration (5 mmol/mL), and the like.

Description

technical field [0001] The invention relates to the field of quantum dot synthesis, in particular to a water-soluble quantum dot and a preparation method thereof. Background technique [0002] Quantum dots have attracted people's attention because of their adjustable band gap and high luminous efficiency. Applications related to quantum dots, such as biomarkers, light-emitting diodes, and solar cells, have also been greatly developed. However, water-soluble quantum dots are required in many applications in these areas. [0003] The methods for preparing water-soluble quantum dots mainly include ligand exchange, silica encapsulation, amphiphilic polymer encapsulation and other methods. However, the water-soluble quantum dots obtained by these methods will have the following problems: 1. The phase transfer will destroy the physical and chemical properties of the quantum dots, such as the stability and optical properties of the quantum dots, and the quantum dots do not have a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/06C09K11/02B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/025C09K11/06C09K11/883C09K2211/1044C09K2211/1088C09K2211/188
Inventor 程陆玲杨一行
Owner TCL CORPORATION
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