Near-infrared fluorescence emitting CdTe/CdS core/shell quantum dot, and preparation method thereof

A technology of fluorescence emission and quantum dots, which is applied in the field of near-infrared fluorescence emission quantum dots

Inactive Publication Date: 2014-08-06
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Although CdTe / CdS core / shell quantum dots can be prepared by the method reported in the above literature, some key technical problems still need to be solved: such as the controllability of shell thickness and fluorescence wavelength, photostability, photodegradation and catalytic activity. Wait
Moreover, up to now, there is no report on the near-infrared emitting CdTe / CdS core / shell fluorescent quantum dots with high stability and high catalytic activity based on the layer-by-layer epitaxy strategy.

Method used

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  • Near-infrared fluorescence emitting CdTe/CdS core/shell quantum dot, and preparation method thereof
  • Near-infrared fluorescence emitting CdTe/CdS core/shell quantum dot, and preparation method thereof
  • Near-infrared fluorescence emitting CdTe/CdS core/shell quantum dot, and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0055] in N 2 Under atmosphere and magnetic stirring, tellurium powder and sodium borohydride are added into the alkaline aqueous solution with a pH value of 9.0, and the molar ratio of the tellurium powder and sodium borohydride is 1:2. After reacting at 80° C. for 0.5 hour, a dark red clear liquid was obtained, which was the sodium telluride precursor solution.

[0056] According to the molar ratio of cadmium chloride, tellurium hydride precursor and glutathione is 1:5:10, the mixed aqueous solution of cadmium chloride and glutathione is added rapidly in the described sodium telluride hydride precursor solution, reacts Reflux for 4 hours to prepare a thiol-stabilized cadmium telluride quantum dot solution.

[0057] Utilize the empirical mathematical function of formula I~IX, calculate the concentration of the cadmium telluride quantum dot solution of gained to be 0.993×10 -6 mol / L, the quantum size of cadmium telluride is 3.221 nanometers, and the doses of cadmium chloride...

Embodiment 2

[0060] in N 2 Under atmosphere and magnetic stirring, tellurium powder and sodium borohydride are added into the alkaline aqueous solution with a pH value of 10.0, and the molar ratio of the tellurium powder and sodium borohydride is 1:2.5. After reacting at 70°C for 0.2 hours, a deep red clear liquid was obtained, which was the sodium telluride precursor solution.

[0061] According to the molar ratio of cadmium chloride, tellurium hydride precursor and glutathione being 1:4:8, the mixed aqueous solution of cadmium chloride and glutathione is quickly added to the sodium telluride hydride precursor solution, and the reaction Reflux for 5 hours to prepare a thiol-stabilized cadmium telluride quantum dot solution.

[0062] Utilize the empirical mathematical function of formula I~IX, calculate the concentration of the cadmium telluride quantum dot solution of gained to be 1.005×10 -6 mol / L, the size of cadmium telluride quantum is 3.204 nanometers, and the dosage of cadmium chl...

Embodiment 3

[0065] in N 2 Under atmosphere and magnetic stirring, tellurium powder and sodium borohydride are added into the alkaline aqueous solution with a pH value of 9.0, and the molar ratio of the tellurium powder and sodium borohydride is 1:2. After reacting at 80° C. for 0.5 hour, a dark red clear liquid was obtained, which was the sodium telluride precursor solution.

[0066] According to the molar ratio of cadmium chloride, tellurium hydride precursor and glutathione is 1:5:10, the mixed aqueous solution of cadmium chloride and glutathione is added rapidly in the described sodium telluride hydride precursor solution, reacts Reflux for 5 hours to prepare a thiol-stabilized cadmium telluride quantum dot solution.

[0067] Utilize the empirical mathematical function of formula I~IX, calculate the concentration of the cadmium telluride quantum dot solution of gained to be 1.047×10 -6 mol / L, the quantum size of cadmium telluride is 3.026 nanometers, and the doses of cadmium chloride...

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Abstract

The invention provides a near-infrared fluorescence emitting CdTe / CdS core / shell quantum dot, and a preparation method thereof. According to the invention, the CdTe / CdS core / shell quantum dot is formed by a CdTe core and a CdS shell; and the layer-by-layer epitaxy of the shell is achieved by accurately calculating the using amount of a precursor required by the growth of each layer of the shell, so that the problem that the core / shell quantum dot prepared by the conventional hydrothermal method is difficult to control in shell thickness is solved. Compared with the prior art, the method disclosed by the invention is simple and low in cost, and provides a water-soluble product which is capable of emitting near-infrared fluorescence and shows relatively high photostability and photocatalytic activity, thereby having a high reference value for the synthesis and application of high-quality fluorescent quantum dots of other types.

Description

technical field [0001] The invention relates to a near-infrared fluorescent emitting quantum dot, in particular to a CdTe / CdS core / shell type near-infrared fluorescent emitting quantum dot with high stability and catalytic activity and a preparation method thereof. Background technique [0002] Colloidal semiconductor nanocrystals (commonly known as quantum dots) show broad application prospects in the fields of light-emitting diodes, photovoltaic cells, sensors, biomarkers, and fluorescence imaging due to their high luminous efficiency and size-dependent optical and electrical properties. Especially for quantum dots (700-900nm) with near-infrared fluorescence emission, Raman scattering and tissue self-absorption in the body can be weakened with the increase of emission wavelength, so that the penetration of excitation light and fluorescence photons can be enhanced, and the target can be penetrated to the site. In addition, the disappearance of autofluorescence in biologica...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 安学勤桂日军龚俊
Owner EAST CHINA UNIV OF SCI & TECH
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