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Preparation method of thiourea modified Cd doping ZnO water-soluble quantum dots

A quantum dot, water-soluble technology, applied in the nanometer field, can solve problems such as poor repeatability, flammable and explosive reagents, and complex experimental operations of quantum dots

Inactive Publication Date: 2010-10-20
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the preparation of CdTe and CdTe / CdS quantum dot nanoparticles, but the quantum dots prepared by this method are complicated in experimental operations, the reagents used are flammable and explosive, high cost and poor repeatability.
Therefore, it is limited to a certain extent in the field of biomedical research

Method used

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  • Preparation method of thiourea modified Cd doping ZnO water-soluble quantum dots
  • Preparation method of thiourea modified Cd doping ZnO water-soluble quantum dots
  • Preparation method of thiourea modified Cd doping ZnO water-soluble quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] ①Take 1.0975gZn(CH 3 COO) 2 2H 2 O and 1.3326gCd(CH 3 COO) 2 2H 2 O was placed in 20ml of absolute ethanol, refluxed at 80°C for 3h, the solution after reflux was a colorless transparent liquid.

[0031] ②Take 5ml of Zn(CH 3 COO) 2 2H 2 O and Cd(CH 3 COO) 2 2H 2 O reflux liquid, add PVP K-30, make the mass concentration of PVPK-30 be 4mg / ml, stir to dissolve.

[0032] ③Weigh 0.12g of thiourea and dissolve it in 10ml of absolute ethanol, then add the absolute ethanol solution of thiourea into ②, and stir evenly so that the mass concentration of the thiourea absolute ethanol solution is 8mg / ml.

[0033] ④Weigh another 0.1180gLiOH·H 2 O was added in 10ml absolute ethanol, 0.2300g Eu(NO3 ) 3 Add to 5ml of absolute ethanol, stir to accelerate dissolution. LiOH·H 2 O, Eu(NO 3 ) 3 The solution was successively added dropwise to a vigorously stirred water bath at 50° C. for 1 hour to prepare a colloidal solution of quantum dot phosphors.

[0034] ⑤ Take an equ...

Embodiment 2

[0036] ①Take 1.0975gZn(CH 3 COO) 2 2H 2 O and 1.3326gCd(CH 3 COO) 2 2H 2 O was placed in 20ml of absolute ethanol, refluxed at 80°C for 3h, the solution after reflux was a colorless transparent liquid.

[0037] ②Take 5ml of Zn(CH 3 COO) 2 2H 2 O and Cd(CH 3 COO) 2 2H 2 O reflux liquid, add PVP K-30, make the mass concentration of PVPK-30 be 4mg / ml, stir to dissolve.

[0038] ③Weigh 0.24g of thiourea and dissolve it in 10ml of absolute ethanol, then add the absolute ethanol solution of thiourea into ②, and stir evenly so that the mass concentration of the thiourea in absolute ethanol is 16mg / ml.

[0039] ④Weigh another 0.1180gLiOH·H 2 O was added in 10ml absolute ethanol, 0.2300g Eu(NO 3 ) 3 Add to 5ml of absolute ethanol, stir to accelerate dissolution. LiOH·H 2 O, Eu(NO 3 ) 3 The solution was successively added dropwise to a vigorously stirred water bath at 50° C. for 1 hour to prepare a colloidal solution of quantum dot phosphors.

[0040] ⑤ Take an equal ...

Embodiment 3

[0042] ①Take 1.0975gZn(CH 3 COO) 2 2H 2 O and 1.3326gCd(CH 3 COO) 2 2H 2 O was placed in 20ml of absolute ethanol, refluxed at 80°C for 3h, the solution after reflux was a colorless transparent liquid.

[0043] ②Take 5ml of Zn(CH 3 COO) 2 2H 2 O and Cd(CH 3 COO) 2 2H 2 O reflux liquid, add PVP K-30, make the mass concentration of PVPK-30 be 4mg / ml, stir to dissolve.

[0044] ③Weigh 0.48g of thiourea and dissolve it in 10ml of absolute ethanol, then add the absolute ethanol solution of thiourea into ②, and stir evenly so that the mass concentration of the thiourea in absolute ethanol is 32mg / ml.

[0045] ④Weigh another 0.1180gLiOH·H 2 O was added in 10ml absolute ethanol, 0.2300g Eu(NO 3 ) 3 Add to 5ml of absolute ethanol, stir to accelerate dissolution. LiOH·H 2 O, Eu(NO 3 ) 3 The solution was successively added dropwise to a vigorously stirred water bath at 50° C. for 1 hour to prepare a colloidal solution of quantum dot phosphors.

[0046] ⑤ Take an equal ...

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Abstract

The invention relates to a preparation method of thiourea modified Cd doping ZnO water-soluble quantum dots, which comprises the following steps: firstly, using Zn(CH3COO)2.2H2O as zinc sources, Cd(CH3COO)2.2H2O as cadmium sources and absolute ethyl alcohol as solvents for carrying back flowing for 3h in water bath under the condition of 80 DEG C; adding the PVP K-30 as stabilizing agents for preparing precursor solution; then, adding absolute ethyl alcohol solution of thiourea, LiOH.H2O and Eu(NO3)3 for carrying out water bath reaction for 1h at 50 DEG C to obtain the thiourea modified Cd doping ZnO water-soluble quantum dots. The method of the invention has the advantages of simplicity, easy implementation, mild reaction condition and simple equipment. The prepared quantum dots have high stability, good dispersivity, uniform grain diameter distribution and high fluorescence quantum dot efficiency.

Description

technical field [0001] The invention relates to the field of nanotechnology, in particular to a preparation method of thiourea-modified Cd-doped ZnO water-soluble quantum dots. Background technique [0002] Quantum dots, also known as semiconductor nanocrystals, are nanoparticles composed of II-VI or III-V elements, with a diameter of about 1-100 nm. Under the induction of excitation light, quantum dots will produce fluorescence. At present, the most researched is mainly CdX (X=S, Se, Te), and some nanoparticles with composite structure and multilayer structure. Since the late 1970s, quantum dots have attracted the attention of physicists, chemists, and electronic engineers due to their unique optical and electrical properties. In recent years, ZnO has been particularly prominent. ZnO has excellent optical and electrical properties. It is a wide-bandgap semiconductor material with a direct bandgap. The bandgap at room temperature is 3.2eV, and the exciton binding energy is...

Claims

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Application Information

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IPC IPC(8): C09K11/54B82B3/00
Inventor 赵肃清赵斌张焜刘端苏娟黎文聪叶建斌
Owner GUANGDONG UNIV OF TECH
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