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Method for water-phase rapid synthesis of CdTe nano crystal at warm condition

A technology of nanocrystals and conditions, which is applied in the field of synthesizing water-soluble CdTe nanocrystal precursors under conditions and conditions, can solve the problems of slow growth of nanocrystals, harsh reaction conditions, and low quantum yields, and achieves relatively low synthesis temperatures. , low synthesis temperature and high quantum yield

Inactive Publication Date: 2009-10-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, CdTe nanocrystals prepared by organic reaction methods require high temperature and harsh reaction conditions; while aqueous phase synthesis of CdTe nanocrystals has low quantum yield and wide emission peaks, the stabilizers used in the background technology, nano Crystal growth is slow, and it takes a long time to obtain nanocrystals with larger emission wavelengths, etc.
In order to overcome the shortcomings of preparing nanocrystals in the background technology, it is an important subject in this technical field to study a kind of water-phase CdTe nanocrystals that can be rapidly synthesized with high quantum yield under mild conditions at lower temperatures

Method used

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  • Method for water-phase rapid synthesis of CdTe nano crystal at warm condition
  • Method for water-phase rapid synthesis of CdTe nano crystal at warm condition
  • Method for water-phase rapid synthesis of CdTe nano crystal at warm condition

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Experimental program
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Effect test

Embodiment 1

[0027] 1. Take Te powder and KBH 4 Reaction, synthetic KHTe aqueous solution:

[0028] 0.48mmol Te powder and 290mg KBH 4 Put it into a reaction bottle filled with 1ml of water, keep stirring, stop the bottle with a rubber stopper, and use a hollow needle to discharge the hydrogen gas generated by the system through the pinhole, and react for 1 hour. During this process, Te powder continuously Dissolved, the solution first turns purple, the color continues to fade, and finally becomes colorless and transparent, that is, the KHTe aqueous solution is synthesized. spare.

[0029] 2. With CdCl 2 , KHTe and stabilizer GSH, synthesize nanocrystal precursor aqueous solution:

[0030] Add 400ml of deionized water to a three-neck reaction flask, add 0.96mmol of CdCl 2 and 2.4mmol of GSH stabilizer to dissolve. where CdCl 2 , KHTe, GSH molar ratio is 1:0.5:2.5. Then pass high-purity nitrogen gas for 20 minutes to remove the oxygen in the system, adjust the pH value to 11.0 with ...

Embodiment 2

[0036] 1. Using Te powder and NaBH 4 Reaction, synthesis of NaHTe aqueous solution:

[0037] 0.48mmol Te powder and 250mg NaBH 4 Put it into a reaction bottle filled with 2ml of deionized water, stir constantly, and stopper the bottle mouth with a rubber stopper. At the same time, use a hollow needle to discharge the hydrogen gas generated in the system through the pinhole, and react for 1.5 hours. During this process, the Te powder was continuously dissolved, and the solution first turned purple, then gradually became lighter in color, and finally became colorless. That is, a colorless and transparent NaHTe aqueous solution is synthesized. spare.

[0038] 2. With CdCl 2 , NaHTe and stabilizer GSH, synthesize nanocrystal precursor aqueous solution:

[0039] Add 600ml of deionized water to a three-necked flask, add 2.4mmol of CdCl 2 and 4.8 mmol of GSH stabilizer to dissolve. where CdCl 2 , NaHTe, and GSH in a molar ratio of 1:0.2:2. Then pass high-purity helium for 20...

Embodiment 3

[0045] 1. Take Te powder and KBH 4 Reaction, synthetic KHTe aqueous solution:

[0046] 0.96mmol Te powder and 500mg KBH 4 Put it into a reaction bottle filled with 5ml of deionized water, stir constantly, stopper the bottle mouth with a rubber stopper, and at the same time, use a hollow needle to discharge the hydrogen gas generated in the system through a pinhole, and react for 2 hours. During this process, the Te powder was continuously dissolved, and the solution first turned purple, then gradually became lighter in color, and finally became colorless. That is to synthesize colorless and transparent KHTe aqueous solution. spare.

[0047] 2. With CdCl 2 ·5 / 2H 2 O, KHTe and stabilizer GSH, synthesis of nanocrystal precursor aqueous solution:

[0048] Add 1000ml of deionized water to a three-necked flask, add 1.92mmol of CdCl 2 ·5 / 2H 2 O and 6 mmol of GSH stabilizer to dissolve. where CdCl 2 , NaHTe, and GSH in a molar ratio of 1:0.5:3. Then pass high-purity nitroge...

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Abstract

The invention relates to a method for synthesizing water-soluble CdTe nanocrystals under mild conditions. Inorganic tellurium powder and cadmium salt or their hydrates are used as reactants, glutathione is used as a stabilizer, the synthesis temperature is 60-120°C in water phase, under mild conditions, the pH of the solution is 7.0-12.0, and the reaction time is In an open system, CdTe nanocrystals can be synthesized safely and rapidly within 5 minutes to 2 hours. The fluorescent color changes from green through various intermediate colors such as yellow and orange, and finally becomes red. The CdTe nanocrystals prepared by the method have good size controllability, good monodispersity, narrow and symmetrical fluorescence emission peaks; good biocompatibility; good repeatability of the method; quantum yield can reach 40%; stability it is good. The CdTe nanocrystal synthesized by the invention can be widely used in the research field of biological fluorescence labeling.

Description

technical field [0001] The invention relates to a method for preparing semiconductor cadmium telluride (CdTe) nanocrystals with high photoluminescence efficiency by using hydrothermal technology, in particular to a water-soluble CdTe nanocrystal precursor synthesized by using glutathione (GSH) as a stabilizer Aqueous solution, the CdTe nanocrystal precursor grows rapidly under mild conditions at a lower temperature, thereby synthesizing a method for CdTe nanocrystals with uniform scale and high luminous efficiency. Background technique [0002] CdTe nanocrystal is a semiconductor material with high luminescence quantum yield. , especially water-soluble semiconductor nanocrystals with high luminous intensity have been widely used in photonic devices, lasers, biotechnology, especially in bioluminescence labeling. Compared with traditional organic fluorescent dyes, luminescent nanocrystals have unique physical and chemical properties. First, due to the quantum size effect of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/48
Inventor 金钦汉牟颖杨蕊闫玉禧冀伟
Owner JILIN UNIV
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