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Hydrothermal preparation method for water-soluble CdTe quantum points

A water-soluble, quantum dot technology, applied in the field of nanotechnology preparation, can solve the problems of low fluorescence quantum efficiency and long reaction time, and achieve the effect of simple equipment and convenient operation

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

A significant disadvantage of this method is that the reaction time is too long, and it generally takes several days to obtain red fluorescent CdTe quantum dots; at the same time, the fluorescence quantum efficiency (QY) of the product is relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. Synthetic sodium tellurium hydride solution: combine 40 mg of Te powder and 25 mg of sodium borohydride NaBH 4 Mix the powders, put them in a 10 ml sample bottle, add 1 ml of deionized water, and then place the reaction bottle at a temperature of 10°C for 8 hours to react to obtain a sodium telluride hydride solution;

[0022] b. Synthesize a mercaptoethylamine stable cadmium chloride solution: add 40 ml of deionized water to a three-necked flask, and then add 18 mg of cadmium chloride and 22 mg of mercaptoethylamine hydrochloride to obtain a Cd / MA molar ratio of 1 / 2.4 Cd-MA precursor solution, where [Cd] = 2 mmol / L;

[0023] c. Synthesis of CdTe precursor solution: Blow nitrogen into the above Cd-MA precursor solution for 30 minutes, add 125 microliters of the prepared sodium tellurium hydride solution, and stir for 10 minutes to obtain a CdTe precursor solution, where Cd / Te moles The ratio is 1 / 0.5, and the pH of the solution is adjusted to 5;

[0024] d. Preparation ...

Embodiment 2

[0026] a. Synthetic sodium tellurium hydride solution: combine 40 mg of Te powder and 25 mg of sodium borohydride NaBH 4 Mix the powders, put them in a 10 ml sample bottle, add 1 ml of deionized water, and then place the reaction bottle at a temperature of 10°C for 8 hours to react to obtain a sodium telluride hydride solution;

[0027] b. Synthesis of mercaptoethylamine stabilized cadmium chloride solution: add 40 ml of deionized water to a three-necked flask, add 91 mg of cadmium chloride and 137 mg of mercaptoethylamine hydrochloride successively to obtain a Cd / MA molar ratio of 1 / 3 Cd-MA precursor solution, where [Cd] = 10 mmol / L;

[0028] c. Synthesis of CdTe precursor solution: Blow nitrogen into the above Cd-MA precursor solution for 30 minutes, add 250 microliters of the prepared sodium tellurium hydride solution, and stir for 10 minutes to obtain a CdTe precursor solution, where Cd / Te mol The ratio is 1 / 0.2, and the pH of the solution is adjusted to 5;

[0029] d. Prepar...

Embodiment 3

[0031] a. Synthetic sodium tellurium hydride solution: combine 40 mg of Te powder and 25 mg of sodium borohydride NaBH 4 Mix the powders, put them in a 10 ml sample bottle, add 1 ml of deionized water, and then place the reaction bottle at a temperature of 10°C for 8 hours to react to obtain a sodium telluride hydride solution;

[0032] b. Synthesis of mercaptoethylamine stabilized cadmium chloride solution: add 40 ml of deionized water to a three-necked flask, and then add 110 mg of cadmium chloride and 164 mg of mercaptoethylamine hydrochloride to obtain a Cd / MA molar ratio of 1 / 3 Cd-MA precursor solution, where [Cd] = 12 mmol / L;

[0033] c. Synthesis of CdTe precursor solution: Blow nitrogen into the above Cd-MA precursor solution for 30 minutes, add 750 microliters of the prepared sodium tellurium hydride solution, and stir for 10 minutes to obtain a CdTe precursor solution, where Cd / Te mol The ratio is 1 / 0.5, and the pH of the solution is adjusted to 5.5;

[0034] d. Prepara...

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Abstract

The invention discloses a water heat preparing method of water-soluble CdTe quantum point in nanometer technical domain, which comprises the following steps: choosing cadmium chloride or cadmium oxide compound as cadmium source; choosing sodium hydride telluride formed by tellurium powder and sodium borohydride as tellurium source; choosing mercapto group amine compound as stabilizer; producing CdTe fore-body solution under the protection of nitrogen; reacting under water-heating environment; getting the product. This invention possesses warm reacting condition, convenience function, simple device, good dispersibility, even particle size and high fluorescence quantum efficiency, which can be fit for industrial production.

Description

Technical field [0001] The invention relates to a preparation method in the field of nanotechnology, in particular to a hydrothermal preparation method of water-soluble CdTe quantum dots. Background technique [0002] Due to its unique quantum size effect and surface effect, semiconductor quantum dots have many advantages over traditional fluorescent dye molecules used as markers: broad excitation light spectrum, narrow emission spectrum, and symmetry. The fluorescence emission wavelength can be changed by changing the quantum dot’s The size and composition are adjusted so that quantum dots of different sizes can be excited by a single wavelength of light to emit different colors of fluorescence, which can be used for multi-color labeling of multi-target molecules. In addition, quantum dots have high luminous intensity and good photochemical stability, so they are not only widely used in optoelectronic information fields such as optoelectronic devices, light-emitting diodes, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88
Inventor 孙康李万万窦红静杨卫海
Owner SHANGHAI JIAO TONG UNIV
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