Preparation method of water-soluble CdSe quantum dots

A water-soluble, quantum dot technology, applied in the field of nanotechnology preparation, can solve problems such as difficult to achieve large-scale synthesis, complex preparation equipment, etc., and achieve the effects of environmental friendliness, strong stability, and good water solubility

Active Publication Date: 2012-11-07
SHANDONG UNIV
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  • Abstract
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Problems solved by technology

[0004] Chinese patent CN1978587A (application number: 200510019940.6) discloses a method for preparing water-soluble CdSe quantum dots by heating in an ultrasonic water bath. This method requires high-purity nitrogen for oxy

Method used

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  • Preparation method of water-soluble CdSe quantum dots
  • Preparation method of water-soluble CdSe quantum dots
  • Preparation method of water-soluble CdSe quantum dots

Examples

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Embodiment 1

[0086] A method for preparing water-soluble CdSe quantum dots, the steps are as follows:

[0087] (1) Measure 50 ml of 3.2 mmol / L cadmium chloride solution at room temperature; add 293.6 mg of sodium hexametaphosphate and 34.6 microliters of mercaptopropionic acid in sequence under magnetic stirring. After the addition of mercaptopropionic acid, use 1 Adjust the pH to 8 by mol / L sodium hydroxide solution to obtain a cadmium precursor solution;

[0088] (2) Under magnetic stirring conditions, add 2.2 mg of sodium selenite pentahydrate to the cadmium precursor solution prepared in step (1);

[0089] (3) Add 2.4 ml of 85% hydrazine hydrate solution to the solution obtained in step (2), and heat at a constant temperature at 100°C for 5 hours to obtain a water-soluble CdSe quantum dot solution;

[0090] (4) Centrifuge the water-soluble CdSe quantum dot solution obtained in step (3) at 8000 rpm, remove the supernatant, and disperse the resulting precipitate in acetone, centrifuge for three ...

Embodiment 2

[0093] The steps are the same as in Example 1, the difference is that in step (3), the temperature is heated to reflux for 7 hours.

[0094] Such as figure 2 As shown, the obtained water-soluble CdSe quantum dots have a maximum fluorescence emission wavelength of 512.8 nm and a half-peak width of 38.8 nm.

Embodiment 3

[0096] The steps are the same as in Example 1, the difference is that in step (3), heating and refluxing at constant temperature for 9 hours.

[0097] Such as image 3 As shown, the obtained water-soluble CdSe quantum dots have a maximum fluorescence emission wavelength of 517.4 nm and a half-peak width of 39.6 nm.

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Abstract

The invention discloses a preparation method of water-soluble CdSe quantum dots and belongs to the field of nanotechnology preparation. According to the method, sodium selenite is used as a selenium source, cadmium chloride is used as a cadmium source, mercaptopropionic acid and sodium hexametaphosphate are used as double complexing agents, and hydrazine hydrate deoxidizes the sodium selenite in an aqueous solution to prepare the water-soluble CdSe quantum dots in a one-step mode. The preparation method of the water-soluble CdSe quantum dots is simple and easy to operate, mild in conditions and suitable for batch preparation and large-scale synthesis. The prepared CdSe quantum dots are strong in fluorescent radiation in green light areas, and the radiation intensity can be controlled by controlling reaction time.

Description

Technical field [0001] The invention relates to a preparation method in the field of nanotechnology, in particular to a preparation method of water-soluble CdSe quantum dots. Background technique [0002] Quantum dot (QD for short) is a semiconductor nanocrystalline grain with a radius smaller than or close to the radius of the Bohr exciton. Quantum dots have the characteristics of wide absorption spectrum, narrow and symmetrical emission spectrum, adjustable luminescence color, high fluorescence intensity and light stability, etc., and they have been widely used in the fields of biomarking, biosensing and biodetection. At present, most of the quantum dots used in biology come from organic phase synthesis. The quantum dots synthesized by this method have uniform particle size distribution and high quantum yield, but the preparation conditions are harsh, the cost is high, the toxicity is high, and the prepared quantum dots are insoluble Water needs to be further derivatized into ...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 邹桂征刘淑风
Owner SHANDONG UNIV
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