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Method for preparing water-soluble CdTe quantum dots

A quantum dot, water-soluble technology, applied in the field of preparation in the field of nanotechnology, can solve the problems of uncontrollable reaction activity, limited operation flexibility of the preparation method, etc., and achieves the effects of mild reaction conditions, good water solubility and convenient operation method.

Active Publication Date: 2010-10-27
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method uses sodium borohydride as a reducing agent, but sodium borohydride is a strong reducing agent, and its reactivity cannot be adjusted, which limits the operational flexibility of the preparation method

Method used

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  • Method for preparing water-soluble CdTe quantum dots
  • Method for preparing water-soluble CdTe quantum dots
  • Method for preparing water-soluble CdTe quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A preparation method of water-soluble CdTe quantum dots, the steps are as follows:

[0040] (1) Dilute 1.6 milliliters of 0.10 mol / liter cadmium chloride solution to 48 milliliters with double distilled water at room temperature; add 195.8 mg sodium hexametaphosphate and 34.6 microliters of mercaptopropionic acid and hexametaphosphoric acid successively under magnetic stirring conditions The time interval between the addition of sodium and mercaptopropionic acid is 10 minutes. After the addition of mercaptopropionic acid is completed, the pH is adjusted to 11 with 1 mole / liter of sodium hydroxide solution to obtain a cadmium precursor solution;

[0041] (2) Add 5.3 mg of sodium tellurite to the cadmium precursor solution prepared in step (1), and heat and reflux at a constant temperature of 95° C. for 10 minutes;

[0042] (3) Add 0.6 milliliters of 85% hydrazine hydrate solution to the solution prepared in step (2), and heat and reflux at a constant temperature of 95° C...

Embodiment 2

[0046] The steps are the same as in Example 1, except that the step (3) is heated to reflux at a constant temperature for 30 minutes.

[0047] Such as figure 2 As shown, the obtained water-soluble CdTe quantum dots have a maximum fluorescence emission wavelength of 553nm and a full width at half maximum of 66nm.

Embodiment 3

[0049] The steps are the same as in Example 1, except that the step (3) is heated to reflux at a constant temperature for 1 hour.

[0050] Such as image 3 As shown, the obtained water-soluble CdTe quantum dots have a maximum fluorescence emission wavelength of 572nm and a full width at half maximum of 60nm.

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Abstract

The invention discloses a method for preparing water-soluble cadmium telluride (CdTe) quantum dots, and belongs to the field of nano-technology preparation. In the method, sodium tellurite serves as a tellurium source; cadmium chloride serves as a cadmium source; mercaptopropionic acid serves as a coordination agent; sodium hexametaphosphate serves as an auxiliary stabilizing agent; and the water-soluble CdTe quantum dots are prepared by only one step of reducing the sodium tellurite by using hydrazine hydrate in an aqueous phase system. The method has the characteristics of simple and practical operation, mild condition and low toxicity; and quantum dots with different sizes and emission wavelengths can be obtained by a method for controlling a 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 CdTe quantum dots. Background technique [0002] Quantum dot (QD for short) is a semiconductor nanocrystal whose radius is smaller than or close to the radius of Bohr excitons. Quantum dots have the characteristics of wide absorption spectrum, narrow and symmetrical emission spectrum, adjustable emission color, high fluorescence intensity and photostability, and have been widely used in the fields of biomarkers, biosensing and biodetection. CdTe quantum dots are the most widely used II-VI quantum dots. The research on the preparation method of high-quality water-soluble CdTe quantum dots has become the focus of researchers all over the world. 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 ...

Claims

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Application Information

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IPC IPC(8): C01B19/04C09K11/88
Inventor 邹桂征梁国栋
Owner SHANDONG UNIV
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