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Method for preparing CdSe quantum

A technology of quantum dots and content, applied in the field of synthesis of CdSe quantum dots, can solve the problems of expensive toxicity, high comprehensive cost, unfavorable large-scale production, etc., and achieve the effect of easy operation

Inactive Publication Date: 2006-06-21
WUHAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this synthetic route can obtain high-quality CdSe quantum dots with good monodispersity, the various solvents used in this method are flammable, explosive, expensive and highly toxic, and the overall cost is high, which is not conducive to large-scale production.

Method used

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  • Method for preparing CdSe quantum
  • Method for preparing CdSe quantum
  • Method for preparing CdSe quantum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] Embodiment: CdSe quantum dot preparation:

[0022] The process can be seen figure 1 .

[0023] A: Take 70mg of Se, 5g of TOP, and 15g of DOA, mix them and heat them properly in an Ar atmosphere, and dissolve them completely to become a Se stock solution.

[0024] B: Take 23mg of CdO and 0.7g of stearic acid, co-heat to 160°C in an Ar atmosphere, and cool to obtain a white solid. 2.05 g of TPP was added and co-heated to 250°C under Ar atmosphere to obtain a clear solution.

[0025] C: Take 1.2ml of Se stock solution, inject it into the Cd solution at 250°C, react for 120 seconds, cool down, add methanol to precipitate, and centrifuge to collect the precipitate.

[0026] Inspection of CdSe quantum dots:

[0027] A: Dissolve the precipitate with hexane (or organic solvents such as toluene and chloroform), and use centrifugation to remove the precipitate to obtain a clear and transparent solution, such as figure 2 shown. Place the solution under a UV lamp, and you sh...

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Abstract

The invention discloses the method for preparation of CdSe quantum point. The method uses selenium powder and Cd compound, such as cadmium oxide and cadmium acetate, as raw material, to prepare CdSe quantum point of different grain diameter at the temperate condition. The method avoids using the inflammable, explosive, expensive and poisonous compounds, such as TOPO, HAD and TBP. The method has the advantages of handling safety, simplicity, low cost and good repeatability. The products are equal and the monodispersity of the product is good, and the grain diameter can be controlled. The products have the advantages of good fluorescence and stability, long fluorescence life time, high quantum productivity, and good light stability and light resistance. The CdSe quantum point can be used in fluorescence labeling substance, light emission device, laser ray and other fields, and also used in biology and medical detecting and analysis after surface finish.

Description

technical field [0001] The invention relates to a synthesis method of CdSe quantum dots, belonging to the fields of nanoscience and surface chemistry. Background technique [0002] Quantum dots (Quantum Dots, QDs) usually refer to semiconductor nanocrystals whose radii are smaller than or close to the exciton Bohr radius. They have unique fluorescent nanoeffects, such as wide and continuous excitation spectrum, narrow and symmetrical emission spectrum, and luminescence. The wavelength can be adjusted by changing the particle size and composition, with strong fluorescence intensity, slow bleaching rate, and high sensitivity, so it has broad application prospects in luminescent materials, photocatalysis, photosensitive sensors, and fluorescent probe labeling. In particular, quantum dots composed of group IIB and group VIA elements, referred to as type II-VI quantum dots (such as CdSe), have special and excellent fluorescence emission properties in the visible and near-infrared...

Claims

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Application Information

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IPC IPC(8): C09K11/54
Inventor 庞代文徐昊彭俊张志凌田智全朱小波毛蒙
Owner WUHAN UNIV
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