Hydrothermal production method for water-soluble ZnCdSe quantum dot

A water-soluble, hydrothermal technology, applied in the field of preparation in the field of nanotechnology, can solve the problems of short emission wavelength range, difficulty in meeting the requirements, etc., and achieve the effects of convenient operation and simple equipment.

Inactive Publication Date: 2008-07-16
SHANGHAI JIAO TONG UNIV
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AI Technical Summary

Problems solved by technology

At present, quantum dots with high fluorescence quantum yields such as CdSe and CdTe are affected by their own band gaps and can only emit green, yellow and red fluorescence, which is difficult to meet the needs of shorter emission wavelength ranges; ZnSe has a larger band gap, Blue-violet Quantum Dots Suitable for Synthesis of Short Wavelength

Method used

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  • Hydrothermal production method for water-soluble ZnCdSe quantum dot

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a, the precursor solution of synthetic zinc: 27.3 milligrams of zinc chloride and 73.8 milligrams of glutathione were dissolved in 100 milliliters of deionized water, and the pH value of the solution was adjusted to 7 with 1 mol / liter of sodium hydroxide to obtain zinc The precursor solution, where [Zn 2+ ]=2 mmol / liter;

[0029] b. Synthesis of sodium selenium hydride solution: mix 15.8 mg of selenium powder with 76 mg of sodium borohydride, inject 5 milliliters of deionized water, and react for 30 minutes at 30° C. to prepare sodium selenium hydride solution;

[0030] c, synthesis of ZnSe precursor solution: in the precursor solution of zinc, blow nitrogen for 30 minutes, inject 1 milliliter of sodium selenium hydride solution into the precursor solution of zinc, Zn / Se molar ratio 1: 0.2, make ZnSe precursor solution;

[0031] d. Synthesis of ZnSe quantum dots: transfer the ZnSe precursor solution to a reaction kettle, heat and react in an oil bath at 120°C for 30 mi...

Embodiment 2

[0035] a, the precursor solution of synthetic zinc: 136.3 milligrams of zinc chloride and 368.8 milligrams of glutathione were dissolved in 100 milliliters of deionized water, and the pH value of the solution was adjusted to 8 with 1 mol / liter of sodium hydroxide to obtain zinc The precursor solution, where [Zn 2+ ]=10 mmol / liter;

[0036] b. Synthesis of sodium selenium hydride solution: mix 23.7 mg of selenium powder with 118.5 mg of sodium borohydride, inject 5 milliliters of deionized water, and react for 30 minutes at 30° C. to prepare sodium selenium hydride solution;

[0037] c, synthesis of ZnSe precursor solution: in the zinc precursor solution, blow nitrogen gas for 30 minutes, inject 5 milliliters of sodium selenium hydride solution into the zinc precursor solution, Zn / Se molar ratio 1: 0.3, make ZnSe precursor solution;

[0038] d. Synthesis of ZnSe quantum dots: transfer the ZnSe precursor solution to a reaction kettle, heat and react in an oil bath at 130°C for ...

Embodiment 3

[0042] a, the precursor solution of synthetic zinc: 204.5 milligrams of zinc chloride and 553.1 milligrams of glutathione were dissolved in 100 milliliters of deionized water, and the pH value of the solution was adjusted to 9 with 1 mol / liter of sodium hydroxide to obtain zinc The precursor solution, where [Zn 2+ ]=15 mmol / liter;

[0043] b. Synthesis of sodium selenium hydride solution: 47.4 mg of selenium powder and 237 mg of sodium borohydride were mixed, injected into 5 milliliters of deionized water, and reacted for 30 minutes at 30° C. to obtain a sodium selenium hydride solution;

[0044] c, synthesis of ZnSe precursor solution: in the zinc precursor solution, blow nitrogen for 30 minutes, inject 5 milliliters of sodium selenide hydride solution into the zinc precursor solution, Zn / Se molar ratio 1: 0.4, make ZnSe precursor solution;

[0045] d. Synthesis of ZnSe quantum dots: transfer the ZnSe precursor solution to a reaction kettle, heat and react in an oil bath at ...

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Abstract

A hydrothermal preparation method of a water-soluble ZnCdSe ternary quantum dot belongs to the nano technical field; the invention chooses zinc chloride or zinc Oxide as zinc source, sodium hydrogen selenide formed by selenium powder and sodium borohydride as selenium source, glutathione as stabilizer, leading the ZnSe precursor solution to be prepared under the protection of the nitrogen. The ZnSe precursor solution reacts in the hydrothermal environment to obtain the ZnSe quantum dot. The cadmium chloride or the cadmium Oxide chosen as cadmium source, and the glutathione chosen as the stabilizer are mixed together with the prepared ZnSe quantum dot to obtain the ZnCdSe precursor solution. The water-soluble ZnCdSe quantum dot is obtained by leading the ZnCdSe precursor solution to react in the hydrothermal environment. Due to the mild reaction condition, convenient operation and the simple equipment, the invention leads the water-soluble ZnCdSe quantum dot to be suitable for the industrial production with the better dispersion, better uniformity of the particle size and high fluorescent quantum efficiency. .

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 ZnCdSe quantum dots. Background technique [0002] The fluorescence emission wavelength of quantum dots can be adjusted by changing the size and composition. Compared with traditional fluorescent dye molecules, it has a series of advantages such as wide excitation spectrum, narrow emission spectrum, and symmetry. It can be used for multi-color labeling of multi-target molecules, and shows broad application prospects in biomedical fields such as molecular biology, immunobiology, and clinical medicine. Quantum dots required in practical applications must have water solubility, high fluorescence quantum yield and narrow fluorescence spectral half-maximum width. Therefore, the preparation of water-soluble quantum dots with excellent optical properties has become a research hotspot in the preparation of quantum d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/54
Inventor 孙康李万万杨卫海
Owner SHANGHAI JIAO TONG UNIV
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