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Method for preparing water-phase layer assembling of near infrared fluorescence CdTe/CdSe core-shell quanta dots

A core-shell quantum dot, layer-by-layer assembly technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of easy oxidation of CdTe quantum dots, low quantum yield in the near-infrared region, poor stability, etc., and achieve low cost. , mild conditions, safe and easy operation

Inactive Publication Date: 2009-12-23
NANKAI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the above-mentioned defects in the synthesis of core-shell quantum dots by the current organic chemical method; at the same time, it solves the problems that the CdTe quantum dots prepared by the aqueous phase synthesis method are easily oxidized, have poor stability and extremely low quantum yield in the near-infrared region; propose A water-phase layer-by-layer assembly method for near-infrared fluorescent CdTe / CdSe core-shell quantum dots is proposed. The synthesized product CdTe / CdSe quantum dots has good water solubility and stability, high fluorescence quantum yield, and the emission spectrum is in the near-infrared region. Internally adjustable

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1). Preparation of potassium hydride telluride KHTe:

[0024] Add 50 mg KBH to the reaction vessel with the syringe needle ventilated 4 , 58mg (4.5×10 -4 mol)Te powder and 4mL deionized water were reacted with magnetic stirring at room temperature (25°C) for 50 minutes to obtain a colorless transparent liquid, namely a fresh oxygen-free KHTe aqueous solution, which was set aside.

[0025] (2). Preparation of potassium hydride selenide KHSe:

[0026] Add 40 mg KBH to the reaction vessel with the syringe needle ventilated 4 , 48mg (5×10 -4 mol) Se powder, add 5 mL of deionized water, and react at room temperature (25° C.) for 10 minutes under magnetic stirring to obtain a colorless and transparent liquid, that is, a fresh oxygen-free KHSe aqueous solution, which is set aside.

[0027] (3). Configure the stock solution of cadmium chloride and cysteine:

[0028] In a beaker to 361mg (3 × 10 -3 mol) cysteine ​​was added to 285ml deionized water and 15mL (0.1molL -1 )...

Embodiment 2

[0036] (1). Preparation of sodium telluride hydride NaHTe:

[0037] In the reaction vessel with the syringe needle vented, add 12 mg NaBH 4 , 13mg (1×10 -4 mol)Te powder and 1mL deionized water were reacted at room temperature (21°C) for 40 minutes with magnetic stirring to obtain a colorless and transparent liquid, namely a fresh, oxygen-free NaHTe aqueous solution, which was set aside.

[0038] (2). Preparation of sodium selenium hydride NaHSe:

[0039] Add 10 mg NaBH to the reaction vessel with the syringe needle ventilated 4 , 10mg (1×10 -4 mol) Se powder, add 5 mL of deionized water, and react at room temperature (21°C) for 12 minutes under magnetic stirring to obtain a colorless and transparent liquid, namely a fresh, oxygen-free NaHSe aqueous solution, which is set aside.

[0040] (3). Configure the stock solution of cadmium chloride and glutathione:

[0041] Add to 110mg (0.36×10 -3 mol) glutathione, add 57ml deionized water and 3mL (0.1mol L -1 )CdCl 2 Aqueous...

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Abstract

Disclosed is a process for preparing aqueous phase layer-by-layer assembly of core-shell quantum dots of CdTe / CdSe with near-infrared fluorescence. At first, cadmium chloride, mercapto-compound and sodium hydrogen telluride (potassium) are synthesized to be CdTe nanocrystalline core, aqueous solution of cadmium-mercapto compound and fresh solution of sodium hydrogen selenide (potassium) are sequentially added in the CdTe nanocrystalline core, and then reflow to form one layer of the CdSe. By repeating the operation of synthesizing the shell layer, quantum dots of different shell layer number and of emission wavelength within 650 to 800 nanometers are produced. The process of the invention has the advantages of simple operation, mild conditions and low cost, and the quantum dots of CdTe / CdSe of the synthesized product are perfect in water-solubility and stability and relatively high in yielding fluorescent quantum, and the emission spectrum is adjustable within near-infrared region.

Description

【Technical field】: [0001] The invention relates to an aqueous layer-by-layer assembly preparation method of CdTe / CdSe core-shell quantum dots with adjustable fluorescence in the near-infrared region, and belongs to the fields of nanomaterial preparation technology and biological analysis and detection technology. 【Background technique】: [0002] Quantum dots are mainly semiconductor nanoparticles composed of II-VI group elements or III-V group elements. Compared with organic fluorescent dyes, the photoluminescent properties of quantum dots are very superior: long-range excitation, narrow and symmetrical emission peaks, large Stokes shift, high quantum yield, long fluorescence lifetime, and difficult photolysis. Changing the composition and size of quantum dots can effectively adjust the fluorescence emission wavelength of quantum dots, but keeping quantum dots in a small size to obtain near-infrared fluorescence is currently a difficult and hot spot in the field of biologica...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 严秀平张毅
Owner NANKAI UNIV
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