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Method for synthesizing cadmium selenide/zinc selenide/zinc blende double-shell structural quantum nodes

A synthesis method and technology of cadmium selenide, applied in chemical instruments and methods, luminescent materials and other directions, can solve the problems of inconvenient experimental operation, cumbersome operation, slowness and other problems, and achieve a simplified experimental operation, simple equipment, and reduced difficulty and danger. Effect

Active Publication Date: 2009-08-26
TAIZHOU ZECEN BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Adopted metal salts simultaneously use hexadecylamine (n-Hexadecylamine, be called for short HDA) as solvent, and it is solid below 50 degrees centigrade, needs continuous heating to keep solution not to solidify when slowly injecting into reaction vessel, bring to experiment operation Inconvenience
[0008] However, in the reaction system using the non-coordinating substance octadecene (ODE) as the main solvent, the current method requires as many as ten injections of the reaction solution to gradually complete the growth of the quantum dot multi-shell layer, and the operation is more complicated. cumbersome

Method used

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  • Method for synthesizing cadmium selenide/zinc selenide/zinc blende double-shell structural quantum nodes
  • Method for synthesizing cadmium selenide/zinc selenide/zinc blende double-shell structural quantum nodes
  • Method for synthesizing cadmium selenide/zinc selenide/zinc blende double-shell structural quantum nodes

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Embodiment 1: the synthesis method of cadmium selenide / zinc selenide / zinc sulfide double-shell structure quantum dots in a coordinating solvent, the method comprises the following steps:

[0060] a, under an argon environment, by heating to 150 degrees Celsius or ultrasonically dissolving selenium (Se) in tri-n-octylphosphine (TOP) at room temperature, it is made into a TOP-Se solution with a selenium concentration of 0.5 mol / liter; Zinc stearate (ZnSt 2 ) was dissolved in tri-n-octylphosphine to form a TOP-Zn solution with a zinc concentration of 0.2 mol / liter; hexamethyldisilathane ((TMS) 2 S) directly dissolving in tri-n-octylphosphine to form a TOP-S solution with a sulfur concentration of 0.2 mol / liter;

[0061] b. Put 3.5 grams of tri-n-octylphosphine oxide (TOPO) and hexadecylamine (HDA) of the same quality, and 0.1 mmoles of cadmium acetate dihydrate (Cd(Ac) 2 2H 2 0) pack into flask together, seal, be heated to 120 degrees centigrade, evacuate to emerge with...

Embodiment 2

[0084] Embodiment two: the synthetic method of cadmium selenide / zinc selenide / zinc sulfide double-shell structure quantum dots in non-coordinating solvent, the method comprises the following steps:

[0085] a, under an argon environment, by heating to 150 degrees Celsius or ultrasonically dissolving selenium (Se) in tri-n-octylphosphine (TOP) at room temperature, it is made into a solution TOP-Se with a selenium concentration of 0.5 mol / liter; Dilute zinc oxide (ZnO) and six times the number of moles of oleic acid (Oleic acid, abbreviated as OA) with octadecene (ODE) to a zinc concentration of 0.1 mol / liter, heat the zinc oxide to react, and obtain a solution ODE-Zn ; Sulfur (S) was ultrasonically dissolved in octadecene (ODE) at 60 degrees Celsius to form a solution ODE-S with a sulfur concentration of 0.1 mol / liter;

[0086] b. Put 0.1 mmol of cadmium oxide (CdO) and oleic acid (OA) which is 4 times its molar number into a three-necked flask, heat to 150 to 180 degrees Celsi...

Embodiment 3

[0109] Embodiment three: the synthesis method of cadmium selenide / zinc selenide / zinc sulfide double-shell structure quantum dots in non-coordinating solvent, the method comprises the following steps:

[0110] a. Dissolve selenium in tri-n-octylphosphine under argon atmosphere by heating to 150 degrees Celsius or ultrasonically at room temperature to form a solution TOP-Se with a selenium concentration of 0.5 mol / liter; zinc oxide and six times the molar A few oleic acids are diluted from octadecene to a zinc concentration of 0.1 mol / liter, and the zinc oxide is reacted by heating to obtain a solution ODE-Zn; sulfur is ultrasonically dissolved in octadecene at 60 degrees Celsius to form a zinc concentration 0.1 mol / L solution ODE-S;

[0111] b. Put 5 millimoles of cadmium oxide and 3 times the number of moles of oleic acid into a three-necked flask, and heat to 150 to 180 degrees Celsius until a transparent liquid is obtained. After cooling, add 70 milliliters of octadecene an...

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Abstract

The invention discloses a synthetic method of cadmium selenide / zinc selenide / zinc sulfide (CdSe / ZnSe / ZnS) double shell quantum dot. The fluorescence of cadmium selenide / zinc selenide / zinc sulfide quantum dot has comparatively strong luminous intensity and stability, thereby preventing cd element from divulging and leading the materials to be more environmental-friendly and safer. The double shell quantum dot is synthesized in the two systems and the specific steps are that: cadmium selenide crystalline core is formed after fast injection of reaction solution in organic solvent and cadmium selenide crystalline core grows to obtain cadmium selenide quantum dot; after two steps of choosing solution and adding solution, shells of zinc selenide and zinc sulfide grow epitaxially outside the cadmium selenide appearance and the double shell quantum dot is obtained. For adopting chemical solvents that are comparatively very safe and easy to be obtained, the invention has the advantages of safety, easy operation, comparatively low cost and being beneficial for controlling cost and scale production. The obtained materials can be applied to fields such as light-emitting devices, biomolecule fluorescence marker, etc.

Description

technical field [0001] The invention relates to a method for synthesizing quantum dots with a double-shell structure. Cadmium selenide is used as a luminescent core, and two materials, zinc selenide and zinc sulfide, are coated on the outside. Background technique [0002] Quantum dots are also called semiconductor nanocrystals. Quantum dots used as fluorescent markers in the biomedical field are usually synthesized by colloidal chemical methods, and dispersed in a certain solvent can form a stable colloid. Quantum dots are a hot spot in the research of nanomaterials in recent years, and they have extremely high potential application value in medical diagnosis, positioning therapy, molecular biology and cell biology. [0003] The luminescent properties of quantum dots are usually closely related to the defects of their constituent crystals. The defects on the surface and inside of quantum dots will swallow photo-excited electrons, greatly reducing the intensity of emitted f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/88C09K11/54
Inventor 刘祖黎夏星杜桂焕李岳彬陈海生周弦
Owner TAIZHOU ZECEN BIOTECH CO LTD
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