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Raw materials components for preparation sulfide of cadmium nano crystal and process for preparing same

A technology of chalcogenides and nanocrystals, applied in the field of nanomaterials and nanometers, can solve the problem of high price of non-ligand solvents, and achieve uniform and controllable particle size distribution

Inactive Publication Date: 2007-09-12
天津市北洋方菱工业结晶科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The non-ligand solvent price that these background technologies adopt is higher

Method used

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  • Raw materials components for preparation sulfide of cadmium nano crystal and process for preparing same
  • Raw materials components for preparation sulfide of cadmium nano crystal and process for preparing same
  • Raw materials components for preparation sulfide of cadmium nano crystal and process for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Take 0.8mmol of cadmium oxide, 12.6mmol of oleic acid, and 40mL of dibutyl phthalate about 0.15mol, put them in a three-necked flask, pass high-purity Ar gas, stir evenly, and heat to dissolve cadmium oxide to form a uniform solution.

[0038] (2) Dissolve 0.8 mmol of selenium in 4 mL of about 9 mmol of TOP to prepare a clear solution.

[0039] (3) Continue heating the solution obtained in (1) to 180-270°C. At this temperature, inject the solution obtained in (2) into the above solution, keep the growth temperature at 160-250°C for 5 minutes, and cool down to room temperature. CdSe nanocrystals of about 6 nm were obtained. The ultraviolet-visible spectrum of CdSe nanocrystals obtained under this condition is shown in Fig. 1 . Changing the amount of oleic acid to 6.4mmol and keeping other conditions constant, CdSe nanocrystals with a diameter of about 4.5nm can be obtained. The fluorescence emission spectrum of the CdSe nanocrystals obtained under this condition i...

Embodiment 2

[0041] (1) Take 0.8 mmol of cadmium oxide, 12.6 mmol of oleic acid, and about 0.17 mol of 40 mL of dibutyl maleate, put them in a three-necked flask, pass high-purity Ar gas, stir evenly, and heat to dissolve cadmium oxide to form homogeneous solution.

[0042] (2) Dissolve 0.4 mmol of selenium in 4 mL of about 9 mmol of TOP to prepare a clear solution.

[0043] (3) Continue heating the solution obtained in (1) to 180-270°C. At this temperature, inject the solution obtained in (2) into the above solution, keep the growth temperature at 160-250°C for 60 minutes, and cool down to room temperature. CdSe nanocrystals of about 8 nm were obtained. By changing the amounts of cadmium oxide and selenium to 0.25mmol and 1.25mmol respectively, and keeping other conditions unchanged, CdSe nanocrystals with a diameter of about 5nm can be obtained. The powder diffraction spectrum and transmission electron microscope photos of the CdSe nanocrystals obtained under this condition are shown i...

Embodiment 3

[0045] (1) Take 0.2mmol of cadmium oxide, 3.2mmol of oleic acid, and about 86mmol of 40mL dioctyl p-sebacate, put them in a three-necked flask, pass high-purity N 2 gas, stir evenly, and heat to dissolve cadmium oxide to form a uniform solution

[0046](2) Dissolve 0.4 mmol of selenium in 1.5 mL of about 3.4 mmol of TOP to prepare a clear solution.

[0047] (3) Continue heating the solution obtained in (1) to 180-270°C. At this temperature, inject the solution obtained in (2) into the above solution, keep the growth temperature at 160-250°C for 1-5 minutes, and cool down to room temperature , respectively, 2.5-4nm CdSe nanocrystals can be obtained. The energy dispersive spectrum of the obtained CdSe nanocrystals is shown in FIG. 5 .

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Abstract

The invention discloses a cadmium raw material composition and preparing method of sulfur group compound nanometer crystal, which is characterized by the following: the molar rate of sulfur group of cadmium is 1:2-20:60-700 for cadmium oxide: oleinic acid: ester solvent and 1:1-20 for E: ligand solvent and 1:0.5-20 for Cd: E, wherein E is S, Se or Te; the method can provide high-quality CdE nanometer crystal with even size distribution controllably.

Description

technical field [0001] The invention belongs to the field of nanomaterials and nanotechnology, and specifically refers to raw material components and a preparation method for preparing cadmium chalcogen compound nanocrystals. Background technique [0002] Cadmium chalcogenide CdE, E=S, Se or Te, hereinafter referred to as CdE, specifically refers to: cadmium sulfide (Cadmium Sulfide), cadmium selenide (Cadmium Selenide), cadmium telluride (Cadmium Telluride). [0003] II-VI elements can form semiconductors with excellent properties, and the most studied are cadmium chalcogenides such as CdS, CdSe, and CdTe. In recent years, the research on the properties of CdE nanocrystals, also known as quantum dots, has shown its great application prospects. [0004] Taking advantage of the strong size-dependent color light emission properties of CdE nanocrystals, nanocrystals composited with organic polymers and CdE are used to fabricate tunable light-emittin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G11/00C01G11/02
Inventor 王静康谢闯陈巍
Owner 天津市北洋方菱工业结晶科技有限公司
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