Fluoroborate phase transfer method for water dispersion of oil-soluble quantum dots

A fluoroborate, quantum dot technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem of unsatisfactory modification effect of water-dispersible quantum dots, The point hydration particle size is large, and it cannot be stored for a long time. It can achieve good colloidal stability and photochemical stability, achieve water dispersibility, and maintain the effect of morphology and size.

Pending Publication Date: 2021-04-30
NANKAI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a fluoroborate phase transfer method for water dispersion of oil-soluble quantum dots, aiming at the instability of water-dispersible quantum dot colloids in the ligand exchange process and the inability to preserve them for a long time, the hydration of water-dispersible quantum dots Larger particle size and unsatisfactory modification effect of water-dispersible quantum dots to overcome the defects of the prior art

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  • Fluoroborate phase transfer method for water dispersion of oil-soluble quantum dots
  • Fluoroborate phase transfer method for water dispersion of oil-soluble quantum dots
  • Fluoroborate phase transfer method for water dispersion of oil-soluble quantum dots

Examples

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Embodiment 1

[0066] Embodiment 1: Preparation method of water-dispersible CdSe quantum dots.

[0067] A certain amount of selenium powder is dissolved in a certain volume of tri-n-octylphosphine (TOP) to obtain a selenium precursor (concentration 1mol / L);

[0068] Under the condition of inert gas argon, weigh 0.448g of cadmium oxide in 10mL of oleic acid, stir and heat to 160°C to dissolve, then add 96mL of 1-octadecene, heat up to 180°C, then slowly add 24mL of oil The amine was heated again to 280°C, and at this time, 5mL of selenium precursor was immediately injected, the heat source was quickly removed, and the temperature was cooled to room temperature to obtain oil-soluble CdSe quantum dots;

[0069] (1) Dissolve the oil-soluble CdSe quantum dots in a non-polar organic solvent to prepare a solution, then dissolve nitrous tetrafluoroborate in a non-polar organic solvent to prepare a solution B, and then follow the volume of 2:1 Proportioning, add B solution to A solution and stir for...

Embodiment 2

[0070] Embodiment 2: Preparation method of water-dispersible CdZnSeS quantum dots.

[0071] (1) 0.32g of sulfur powder was dissolved in 10mL of TOP to obtain a sulfur precursor;

[0072] (2) The selenium powder of 1.38g is dissolved in the tri-n-octylphosphine (TOP) of 10mL, makes selenium precursor;

[0073] (3) Under the condition of inert gas argon, take 90mL of 1-octadecene and stir it up to 150°C, then add 0.1284g of cadmium oxide and 1.835g of anhydrous zinc acetate, then add 20mL of oleic acid to keep the reaction The temperature is 150°C to completely dissolve cadmium oxide and anhydrous zinc acetate. Under vacuum conditions, remove oxygen, water and other impurities until the reaction solution turns light yellow and no bubbles are generated, and then maintain vacuum conditions for 5 minutes. Then, the vacuum condition was released, and the temperature was rapidly raised to 320 °C under the protection of inert gas argon, and at this time, 1 mL of selenium precursor a...

Embodiment 3

[0075] Example 3: Water-dispersible Ag 2 Preparation method of Te quantum dots.

[0076] (1) Dissolving 77.6mg of tellurium powder in 9mL of TOP to prepare a tellurium precursor;

[0077] (2) Under the condition of inert gas argon, take 10mL of 1-octadecene, add 520uL of octyl mercaptan, stir and heat to 70°C, after 30 minutes, add 33.4mg of silver acetate, heat up to 170°C, at this time Quickly inject 600uL of tellurium precursor, immediately cool down to 120°C, keep it warm for 30 minutes, cool down to room temperature, and then get Ag 2 Te quantum dots;

[0078] (3) The oil-soluble Ag will be prepared by the above method 2 Dissolve Te quantum dots in a non-polar organic solvent to prepare a solution A, then dissolve nitrous tetrafluoroborate in a non-polar organic solvent to prepare a solution B, and then prepare the solution B according to the volume ratio of 2:1 Add it into solution A and stir for a certain period of time, centrifuge after the end of the reaction, dis...

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Abstract

The invention provides a fluoroborate phase transfer method for water dispersion of oil-soluble quantum dots. The fluoroborate phase transfer method comprises the following steps: step 1, dissolving oil-soluble quantum dots in a non-polar organic solvent to prepare a solution A; step 2, dissolving fluoborate in a non-polar organic solvent to prepare a solution B; step 3, adding the solution B into a solution A, stirring for a certain time, centrifuging, and discarding a supernatant; and 4, re-dispersing the precipitate obtained in the step 3 in the polar solvent, and centrifuging again to collect the supernatant, thereby obtaining the water-dispersible quantum dot. The water-dispersible quantum dot is high in chemical stability and good in water phase stability, secondary phase transfer can be achieved, the quantum dot dispersed in the polar solvent can keep good colloid stability and optical stability, and the original morphology and size of the quantum dot are kept.

Description

technical field [0001] The invention belongs to the fields of analytical chemistry, nanometer materials and surface colloid chemistry, and in particular relates to the preparation of water-dispersible quantum dots by a phase transfer method. Background technique [0002] Quantum dots are a class of semiconductor fluorescent nanocrystals with radii smaller than or close to their exciton Bohr radii. The emission spectrum of quantum dots can be controlled by changing the size and composition of quantum dots. Quantum dots with different emission wavelengths from the visible region to the near-infrared region can be obtained by changing the size and chemical composition of the quantum dots. Compared with traditional organic fluorescent dyes and fluorescent proteins, quantum dots have excellent optical properties, such as wide excitation spectrum and narrow emission spectrum; emission wavelength can be adjusted with the size and composition of quantum dots; high quantum yield and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/66C09K11/02B82Y20/00B82Y30/00
CPCC09K11/883C09K11/881C09K11/661C09K11/02B82Y20/00B82Y30/00
Inventor 庞代文石学慧郑磊谭蔚泓
Owner NANKAI UNIV
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