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Method for synthesizing zinc sulfide quantum dots by using oil amine

A quantum dot and zinc sulfide technology, which is applied in the field of zinc sulfide quantum dot synthesis with oleylamine, can solve problems such as easy agglomeration, difficulty in preparing uniform quantum dots with small size, and harsh reaction conditions.

Inactive Publication Date: 2011-04-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many methods for preparing ZnS quantum dots, including solid-phase method, liquid-phase method and gas-phase method. Among them, the liquid-phase method has various preparation forms, simple operation, and controllable particle size, so it has attracted much attention, but its disadvantage is that it is prone to agglomeration Phenomenon
These currently known methods either need to use some toxic precursors, or the reaction conditions are harsh, or it is difficult to prepare uniform quantum dots with small size

Method used

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  • Method for synthesizing zinc sulfide quantum dots by using oil amine
  • Method for synthesizing zinc sulfide quantum dots by using oil amine
  • Method for synthesizing zinc sulfide quantum dots by using oil amine

Examples

Experimental program
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Effect test

Embodiment 1

[0020] 1) First, mix 0.5 mmol of zinc nitrate dihydrate and 5 ml of oleylamine, then heat the mixed solution to 60° C. for 100 minutes, and pass in argon gas while vigorously stirring to obtain a mixed solution A;

[0021] 2) Next, add 0.5 mmol of sulfur powder to the mixed solution A and heat it to 60°C. During the whole process, argon gas is passed into it while vigorously stirring, and the solution B is obtained after reacting for 120 minutes;

[0022] 3) Then, add 10 ml of ethanol to solution B and centrifuge at a speed of 4000 rpm for 10 minutes, remove the supernatant to obtain a precipitate;

[0023] 4) Add 5 milliliters of chloroform and 10 milliliters of ethanol to the precipitate and ultrasonically dissolve the precipitate, mix the solution evenly, centrifuge at a speed of 4000 rpm for 10 minutes, remove the supernatant to obtain a precipitate, then add 5 milliliters of chloroform and 10 ml of ethanol and sonication to dissolve the precipitate completely, mix the sol...

Embodiment 2

[0026] 1) First, mix 1 mmol of zinc nitrate dihydrate and 7 ml of oleylamine, then heat the mixed solution to 80° C. for 120 minutes, and pass in argon gas while vigorously stirring to obtain mixed solution A;

[0027] 2) Next, add 1 mmol of sulfur powder to the mixed solution A and heat it to 90°C. During the whole process, argon gas is introduced, and at the same time, it is vigorously stirred, and the solution B is obtained after reacting for 100 minutes;

[0028] 3) Then, add 12 milliliters of ethanol to solution B and centrifuge at a speed of 5000 rpm for 8 minutes, remove the supernatant to obtain a precipitate;

[0029] 4) Add 6 milliliters of n-hexane and 12 milliliters of ethanol to the precipitate and ultrasonically dissolve the precipitate, mix the solution evenly, centrifuge at a speed of 5000 rpm for 8 minutes, remove the supernatant to obtain a precipitate, then add 6 milliliters of n-hexane to the precipitate Alkanes and 12 milliliters of ethanol and ultrasound ...

Embodiment 3

[0032] 1) First, mix 1.5 millimoles of zinc nitrate dihydrate and 9 ml of oleylamine, then heat the mixed solution to 90° C. for 80 minutes, and pass in argon gas while vigorously stirring to obtain mixed solution A;

[0033] 2) Next, add 1.5 millimoles of sulfur powder to the mixed solution A and heat it to 120°C. During the whole process, argon gas is introduced, while stirring vigorously, and reacted for 80 minutes to obtain solution B;

[0034] 3) Then, add 14 milliliters of ethanol to solution B and centrifuge at a speed of 6000 rpm for 6 minutes, remove the supernatant to obtain a precipitate;

[0035] 4) Add 7 milliliters of tetrachlorethylene and 14 milliliters of ethanol to the precipitate and ultrasonically dissolve the precipitate, mix the solution evenly, centrifuge at a speed of 6000 rpm for 6 minutes, remove the supernatant to obtain a precipitate, and then add 7 milliliters to the precipitate Tetrachlorethylene and 14 milliliters of ethanol are ultrasonically di...

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Abstract

The invention discloses a method for synthesizing zinc sulfide quantum dots by using oil amine, which comprises the following steps of: adding zinc nitrate dihydrate into an oil amine solvent with stirring, adding sulfur powder after the zinc salt is fully dissolved, reacting at the temperature of between 120 and 240 DEG C, performing cleaning and separation by using ethanol after the reaction is finished, and finally dispersing the reaction product in the organic solvent. The method totally does not use alkyl phosphonium or other gas harmful to the environment, and obtains the zinc sulfide quantum dots with regular shape, uniform size and granular size of 2 to 4 nanometers. The synthesizing method has simple operation, strong controllability, mild condition, low cost and high synthesizing speed; and the synthesized quantum dots have the characteristics of good stability and high fluorescent quantum yield.

Description

technical field [0001] The invention relates to a synthesis method of a class of II-VI compound semiconductor quantum dots, in particular to a method for synthesizing zinc sulfide quantum dots with oleylamine. Background technique [0002] ZnS is a wide bandgap II-VI semiconductor material, which has the characteristics of infrared vision, fluorescence, and phosphorescence. The bandgap widths of zinc blende and wurtzite structure zinc sulfide are 3.68eV and 3.91eV, respectively. ZnS is one of the best hosts for electroluminescent materials so far, and it is used in many fields, such as: plasma and electroluminescence, flat panel display (such as field emission display), cathode ray tube (for radar, TV and oscilloscope) materials . In addition, it is also used in sensors, X-ray fluorescence detection, and can also be used to make photoelectric (solar) sensitive components, nanomaterial laser production and photoelectric identification marks for special wavelength control. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/08
Inventor 阙文修申凤宇
Owner XI AN JIAOTONG UNIV
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