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Simplified method for preparing composite materials containing CdTe nano crystal / polymer

A composite material and nanocrystal technology is applied in the simple field of preparing CdTe-containing nanocrystal/polymer composite materials, and can solve the problems of changing shape and difficult to prepare coating-type composites.

Inactive Publication Date: 2004-11-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is simple and cheap, the resulting composite material usually exists in the form of a large and hard block, and it is difficult to prepare a paint-type composite and change its shape

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1: with CdCl 2 , NaHTe, and thioglycolic acid as raw materials to synthesize CdTe nanocrystals

[0015] NaHTe aqueous solution through Te powder and NaBH 4 Reaction preparation: first mix 80mg NaBH 4 Fully dissolve in 1ml of deionized water, then add 127.5mg of Te powder, leaving only one pinhole to discharge the hydrogen generated in the system, and react in an ice-water bath for 8 hours to obtain a 1M NaHTe aqueous solution.

[0016] Add 1.25×10 to 1000ml reaction system -3 M CdCl 2 and 3×10 -3 M thioglycolic acid, adjust the pH to 9.0 with NaOH, and pass through N 2 Gas protection; add 0.25ml 1M NaHTe aqueous solution under stirring condition; CdCl 2 , NaHTe, the molar ratio of thioglycolic acid is 1:0.2:2.4. The newly prepared CdTe aqueous sol was refluxed at 100°C, and the discharge time and performance parameters of CdTe nanocrystals with various luminescent colors are shown in Table 1. (Quantum efficiency refers to the ratio of the number of photons emitt...

Embodiment 2

[0027] 1: with CdCl 2 , NaHTe, and mercaptopropionic acid as raw materials to synthesize CdTe nanocrystals

[0028] NaHTe aqueous solution through Te powder and NaBH 4 Reaction preparation: first mix 80mg NaBH 4 Fully dissolve in 1ml of deionized water, then add 127.5mg of Te powder, leaving only one pinhole to discharge the hydrogen generated in the system, and react in an ice-water bath for 8 hours to obtain a 1M NaHTe aqueous solution.

[0029] Add 1.25×10 to 1000ml reaction system -3 M CdCl 2 and 3×10 -3 M's mercaptopropionic acid, adjust the pH to 9.0 with NaOH, and pass N 2 Gas protection; add 0.625ml 1M NaHTe aqueous solution under stirring condition; CdCl 2 , NaHTe, the molar ratio of mercaptopropionic acid is 1:0.5:2.4. The newly prepared CdTe aqueous sol was refluxed at 100°C, and the discharge time and performance parameters of CdTe nanocrystals with various luminescent colors are shown in Table 2.

[0030] glow color

Reflux time (hours)

Emiss...

Embodiment 3

[0037] 1: with CdCl 2 , NaHTe, and mercaptolactic acid as raw materials to synthesize CdTe nanocrystals

[0038] NaHTe aqueous solution through Te powder and NaBH 4 Reaction preparation: first mix 80mg NaBH 4 Fully dissolve in 1ml of deionized water, then add 127.5mg of Te powder, leaving only one pinhole to discharge the hydrogen generated in the system, and react in an ice-water bath for 8 hours to obtain a 1M NaHTe aqueous solution.

[0039] Add 1.25×10 to 1000ml reaction system -3 M CdCl 2 and 3×10 -3 M mercaptolactic acid, adjust the pH to 9.0 with NaOH, and pass N 2 Gas protection; add 0.25ml 1M NaHTe aqueous solution under stirring condition; CdCl 2 , NaHTe, the molar ratio of mercaptolactic acid is 1:0.2:2.4. The newly prepared CdTe aqueous sol was refluxed at 100°C, and the discharge time and performance parameters of CdTe nanocrystals with various luminous colors are shown in Table 3.

[0040] glow color

Reflux time (hours)

Emission peak posi...

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PUM

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Abstract

The invention relates to a simplified process for preparing CdTe-containing nanocrystalline / polymeric composite material which comprise, conducting surface finish to water-soluble CdTe semiconductor nanocrystalline by the amphipathic copolymer containing quaternary ammonium salt, transferring into organic phase so as to obtain compound of nanocrystalline and polymer, thus the semiconductor nanocrystalline / polymer composite material containing high luminous efficiency CdTe is prepared. The preparation process comprises five steps of preparing water-soluble CdTe semiconductor nanocrystalline, synthesis of polymeric surfactant, copolymerization of polymeric surfactant with phenylethene, phase transition of nanocrystalline, and forming of the composite material.

Description

technical field [0001] The invention relates to a method for preparing inorganic nanocrystal / polymer composite material, in particular to a method for modifying the surface of water-soluble CdTe semiconductor nanocrystal with an amphiphilic copolymer containing quaternary ammonium salt, and transferring it to an organic phase The compound of nano crystal and polymer is obtained, so as to prepare the method of CdTe semiconductor nano crystal / polymer composite material with high luminous efficiency. Background technique [0002] Nanocrystalline / polymer composites with photoluminescent properties can be potentially applied in optical displays, nonlinear optical devices, bioluminescent markers, especially anti-counterfeiting signs and other fields. Therefore, it has attracted extensive attention of researchers. The key to the composite of nanocrystals and polymers is to maintain the monodispersity of nanocrystals and their light-emitting properties. The early method to achieve ...

Claims

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Application Information

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IPC IPC(8): C08K3/10C08L25/08
Inventor 杨柏张皓王春雷李敏杰张俊虎
Owner JILIN UNIV
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