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Method of synthesizing near-infrared CdHgTe and CdHgTe/CdS fluorescence quantum points

A technology of fluorescent quantum dots and synthesis methods, applied in the field of biological analysis and detection, can solve the problems of narrow fluorescence emission, inability to obtain, wide peak shape, etc., and achieve the effect of high quantum yield, simple steps and mild conditions

Inactive Publication Date: 2007-08-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the emission peak of quantum dots prepared by this method is in the near-infrared region, the peak shape is too broad to obtain narrow and symmetrical fluorescence emission.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Preparation of sodium telluride hydride

[0021] Put 80 mg of tellurium powder, 80 mg of sodium borohydride and 2 ml of water in a 10 ml small flask, and immediately seal the mouth of the small reaction flask with a rubber stopper, and insert a long needle on the rubber stopper to release the reaction. of hydrogen. After reacting at room temperature for 8 hours, the black tellurium powder gradually disappeared, and white sodium borate precipitates appeared at the bottom of the flask. Carefully transfer the supernatant in the flask to a 100 ml flask filled with degassed ultrapure water to prepare a 6.25 mmol / L sodium telluride hydride solution.

[0022] 2. Aqueous phase synthesis of near-infrared CdHgTe quantum dots

[0023] Dissolve 0.125 mmol cadmium chloride and 0.025 mmol mercuric chloride in 90 ml ultrapure water, add 0.625 mmol mercaptopropionic acid and adjust the pH value to 9.0, inject 10 ml of 6.25 mmol / L NaHTe solution, this When the CdHgTe precursor sol...

Embodiment 2

[0027] 1. Preparation of sodium telluride hydride

[0028] Put 0.4g of tellurium powder, 0.3g of sodium borohydride and 10ml of water in a 25ml small flask, and immediately seal the mouth of the small flask with a rubber stopper, and at the same time insert a long needle on the rubber stopper to release the reaction. of hydrogen. After reacting at room temperature for 12 hours, the black tellurium powder disappeared gradually, and white sodium borate precipitate appeared at the bottom of the flask. Carefully transfer the supernatant in the flask to a 100 ml flask filled with degassed ultrapure water to prepare a 0.0313 mol / L potassium hydride telluride solution.

[0029] 2. Aqueous phase synthesis of near-infrared CdHgTe quantum dots

[0030] Dissolve 6.25 mmol of cadmium perchlorate, 3.13 mmol of mercury perchlorate and 28 mmol of mercaptoacetic acid in 90 ml of ultrapure water, adjust the pH of the solution to 11.0, and inject the prepared 0.0313 mol / L Potassium hydride t...

Embodiment 3

[0034] 1. Preparation of sodium telluride hydride

[0035] Put 0.64g of tellurium powder, 0.64g of sodium borohydride and 20ml of water in a 25ml small flask, and seal the opening of the reaction small flask with a rubber stopper immediately, and insert a long needle on the rubber stopper to release the reaction. of hydrogen. After reacting at room temperature for 12 hours, the black tellurium powder disappeared gradually, and white sodium borate precipitate appeared at the bottom of the flask. Carefully transfer the supernatant in the flask to a 100 ml flask filled with degassed ultrapure water to prepare a 0.05 mol / L sodium telluride hydride solution.

[0036] 2. Aqueous phase synthesis of near-infrared CdHgTe quantum dots

[0037] Dissolve 2.5 mmoles of cadmium acetate, 2.5 mmoles of mercury acetate and 10 mmoles of mercaptopropionic acid in 90 ml of ultrapure water, adjust the pH value of the solution to about 7.0, and inject the prepared 0.05 mol / L hydrogen telluride S...

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Abstract

The invention discloses a synthetic method of near-infrared CdHgTe and CdHgTe / CdS fluorescence quantum point, which comprises the following steps: choosing water as dissolvent; choosing cadmium salt, mercuric salt and sodium hydride telluride as reacting forerunner body; choosing sulfhydryl group compound as stabilizer; synthesizing CdHgTe quantum point through heating directly with luminous position at 600-900 nanometer, quantum yield at 10-30% and half-peak width of sending peak at 40-70 nanometer; injecting into cadmium salt, sulfide and sulfhydryl group compound; heating; getting CdHgTe / CdS core-shell quantum point with fluorescence spectrum red shift at 10-20 nanometer. This invention possesses simple steps, warm condition and high quantum yield, which can be used to cell image formation and tissue image formation widely.

Description

technical field [0001] The invention relates to a method for synthesizing near-infrared CdHgTe and CdHgTe / CdS fluorescent quantum dots, and belongs to the technical fields of nanometer material preparation technology and biological analysis and detection technology. Background technique [0002] Because organisms have small absorption and autofluorescence in the near-infrared region (700-900 nanometers), near-infrared light has better penetration and higher sensitivity in biological tissues. It is used in cell imaging and tissue imaging. It has broad application prospects. However, the synthesis of traditional near-infrared fluorescent dyes is expensive and prone to photobleaching, which brings many inconveniences to practical applications. At present, fluorescent quantum dots have attracted extensive attention due to their advantages such as broad excitation, narrow emission, high quantum yield, and good photostability. People began to use near-infrared fluorescent quantu...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 任吉存钱惠锋
Owner SHANGHAI JIAO TONG UNIV
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