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Method for conversion of oil soluble quantum dots into water soluble quantum dots

A quantum dot and oil-soluble technology, which is applied in the field of converting oil-soluble quantum dots into water-soluble quantum dots, can solve the problems of small volume and poor stability of quantum dots, achieve good reproducibility, simple method, and easy connection Effect

Active Publication Date: 2014-07-09
SHENZHEN INST OF ADVANCED TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above methods have their own advantages and disadvantages: the quantum dots obtained by the first method are directly modified by the ligands on the surface of the quantum dots, which are greatly affected by environmental factors and have poor stability, but the modified quantum dots have relatively smaller volume; although the quantum dots modified by the second method have basically no effect on the surface properties of the quantum dots, have strong stability, and are less affected by environmental factors, but the modified quantum dots have a larger volume

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  • Method for conversion of oil soluble quantum dots into water soluble quantum dots
  • Method for conversion of oil soluble quantum dots into water soluble quantum dots
  • Method for conversion of oil soluble quantum dots into water soluble quantum dots

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Embodiment 1

[0031] Step 1. Preparation of coordination polymer A: Weigh 1 g of polymaleic anhydride, 1 g of adenine or histamine, and 0.01 g of 4-dimethylaminopyridine, dissolve them in 20 ml of dimethyl sulfoxide, react for 8 hours, and set aside ;

[0032] Step 2. Preparation of chloroform solution B of oil-soluble quantum dots (CdSe / ZnS): This literature can be used (Li, J.J.; Wang, Y.A.; Guo, W.; Keay, J.C.; Mishima, T.D.; Johnson, M.B.; Peng , X.J.Am.Chem.Soc.2003,125,12567) to prepare oil-soluble quantum dots CdSe / ZnS, by controlling the reaction time to obtain quantum dots with an emission wavelength of 525nm, and then dissolve the quantum dots with an emission wavelength of 525nm in chloroform In, the prepared concentration is the chloroform solution of the oil-soluble quantum dot of 0.1mg / ml;

[0033]Step 3. Convert oil-soluble quantum dots into water-soluble quantum dots: slowly add 1ml of solution A to 1ml of solution B to form a transparent solution, then add 0.5ml of 1M sodi...

Embodiment 2

[0035] Step 1, with the step 1 of embodiment 1;

[0036] Step 2. Preparation of chloroform solution B of oil-soluble quantum dots (CdSe / ZnS): This literature can be used (Li, J.J.; Wang, Y.A.; Guo, W.; Keay, J.C.; Mishima, T.D.; Johnson, M.B.; Peng , X.J.Am.Chem.Soc.2003,125,12567) to prepare oil-soluble quantum dots CdSe / ZnS, by controlling the reaction time to obtain quantum dots with an emission wavelength of 545nm, and then dissolve the quantum dots with an emission wavelength of 545nm in chloroform In, the prepared concentration is the chloroform solution of the oil-soluble quantum dot of 0.1mg / ml;

[0037] Step 3, oil-soluble quantum dots are converted into water-soluble quantum dots: slowly add 1ml of solution A to 1ml of solution B to form a transparent solution, then add 0.5ml of 1M aqueous sodium hydroxide solution, centrifuge at 10000rpm for 10min and take the upper aqueous solution, and use A 50KDa ultrafiltration tube removes excess polymer, which is dissolved in...

Embodiment 3

[0039] Step 1, with the step 1 of embodiment 1;

[0040] Step 2. Preparation of chloroform solution B of oil-soluble quantum dots (CdSe / ZnS): This literature can be used (Li, J.J.; Wang, Y.A.; Guo, W.; Keay, J.C.; Mishima, T.D.; Johnson, M.B.; Peng , X.J.Am.Chem.Soc.2003,125,12567) to prepare oil-soluble quantum dots, by controlling the reaction time, to obtain quantum dots with an emission wavelength of 565nm, and then dissolve the quantum dots with an emission wavelength of 565nm in chloroform to prepare A chloroform solution of oil-soluble quantum dots with a concentration of 0.1 mg / ml was obtained;

[0041] Step 3, oil-soluble quantum dots are converted into water-soluble quantum dots: slowly add 1ml of solution A to 1ml of solution B to form a transparent solution, then add 0.5ml of 1M aqueous sodium hydroxide solution, centrifuge at 10000rpm for 10min and take the upper aqueous solution, and use A 50KDa ultrafiltration tube removes excess polymer, which is dissolved in ...

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Abstract

The invention provides a method for conversion of oil soluble quantum dots into water soluble quantum dots. The method comprises the steps of: 1. dissolving polymaleic anhydride, adenine or histamine, and 4-dimethylaminopyridine in dimethyl sulfoxide to let the materials react, thus obtaining a coordination polymer solution; 2. dissolving the oil soluble quantum dots in chloroform to obtain a chloroform solution of the oil soluble quantum dots; and 3. adding the coordination polymer solution obtained in step 1 into the chloroform solution of the oil soluble quantum dots obtained in step 2 slowly to form a transparent solution, then adding a sodium hydroxide aqueous solution, conducting centrifugation, then taking the upper water solution, removing the excess polymer by an ultrafiltration pipe to obtain filter residue, and dissolving the filter residue in water so as to obtain the water soluble quantum dot solution. The method is simple and practicable, has good reproducibility and universality.

Description

technical field [0001] The invention relates to a method for converting oil-soluble quantum dots into water-soluble quantum dots, in particular to a method for efficiently converting oil-soluble quantum dots into water-soluble quantum dots using a coordination polymer as a modification reagent. Background technique [0002] Quantum dots are quantum dots (Quantum dots, QDs), which are composed of hundreds of atoms and have a particle size of 1-100nm semiconductor nanocrystals, which can receive excitation light to generate fluorescence, and the wavelength of emitted light can be controlled Compared with traditional organic fluorescent dyes, quantum dots have a wide and continuous absorption spectrum and a narrow and symmetrical emission spectrum. The emission spectrum can be adjusted by the size, composition and structure of the material itself, covering the range from visible light to near-infrared. And it has excellent anti-photobleaching performance. It is because of these...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/88
Inventor 蔡林涛张鹏飞高笃阳盛宗海胡德红龚萍
Owner SHENZHEN INST OF ADVANCED TECH
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