Method for ultrasonically and electrochemically synthesizing water-soluble CdTe quantum dot

A technology of sonoelectrochemistry and quantum dots, applied in chemical instruments and methods, electrolytic processes, electrolytic components, etc., can solve problems such as harsh reaction conditions and complex reaction processes, and achieve the effect of simple and controllable particle size

Inactive Publication Date: 2014-06-18
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on the above reasons, the purpose of the present invention is to provide a method for conveniently and rapidly synthesizing semiconductor quantum dots CdTe to solve the technical problems of complex traditional reaction process and harsh reaction conditions

Method used

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  • Method for ultrasonically and electrochemically synthesizing water-soluble CdTe quantum dot
  • Method for ultrasonically and electrochemically synthesizing water-soluble CdTe quantum dot
  • Method for ultrasonically and electrochemically synthesizing water-soluble CdTe quantum dot

Examples

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Embodiment 1

[0039] A method for sonoelectrochemically synthesizing water-soluble CdTe quantum dots, the steps are as follows:

[0040] (1) Stir and add CdCl with a concentration of 50mM into 47mL pure water in sequence 2 2 ml, 17.6 μL of 3-mercaptopropionic acid, 50 mM Na 2 TeO 3 1mL, so that the molar ratio of the three is 2:4:1;

[0041] (2) Adjust the above mixed solution with NaOH to make the pH 11;

[0042] (3) Place the sonoelectrochemical device containing the ultrasonic electrode in the solution adjusted in step (2), and set the reaction parameters of the sonoelectrochemical device, which are current size 0.01A, current pulse time 0.5s, current intermittent time 1.5s, ultrasonic time 0.3s, reaction temperature 70°C, reaction time 3000s, ultrasonic pulse intensity 20W.

[0043] (4) Start the sonoelectrochemical device, the reaction begins, and CdTe quantum dots are finally formed.

[0044] like figure 1 As mentioned, under the conditions of this embodiment, it can be seen thr...

Embodiment 2

[0049] A method for sonoelectrochemically synthesizing water-soluble CdTe quantum dots, the steps are as follows:

[0050] (1) Stir and add CdCl with a concentration of 50mM into 235mL pure water in sequence 2 10ml, 88μL of 3-mercaptopropionic acid with a concentration of 50mM Na 2 TeO 3 5mL, so that the molar ratio of the three is 2:4:1;

[0051] (2) Adjust the above mixed solution with NaOH so that the pH is 10;

[0052] (3) Place the sonoelectrochemical device containing the ultrasonic electrode in the solution adjusted in step (2), and set the reaction parameters of the sonoelectrochemical device, which are current size 0.05A, current pulse time 0.1s, current intermittent time 1.9s, ultrasonic time 0.1s, reaction temperature 70°C, reaction time 1000s, ultrasonic pulse intensity 20W.

[0053] (4) Start the sonoelectrochemical device, the reaction begins, and CdTe quantum dots are finally formed.

Embodiment 3

[0055] A method for sonoelectrochemically synthesizing water-soluble CdTe quantum dots, the steps are as follows:

[0056] (1) Stir and add CdCl with a concentration of 50mM into 24mL pure water in sequence 2 1ml, 8.8μL of 3-mercaptopropionic acid with a concentration of 50mM Na 2 TeO 3 1mL, so that the molar ratio of the three is 2:4:1;

[0057] (2) Adjust the above mixed solution with NaOH to make the pH 11

[0058] (3) Place the sonoelectrochemical device containing the ultrasonic electrode in the solution adjusted in step (2), and set the reaction parameters of the sonoelectrochemical device, which are current size 0.1A, current pulse time 1.0s, current intermittent time 1.0s, ultrasonic time 0.1s, reaction temperature 70°C, reaction time 3000s, ultrasonic pulse intensity 20W.

[0059] (4) Start the sonoelectrochemical device, the reaction begins, and CdTe quantum dots are finally formed.

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Abstract

The invention discloses a novel method for ultrasonically and electrochemically synthesizing a water-soluble CdTe quantum dot, belonging to the field of material synthesis and solves the problems of low yield and strict reaction condition in a traditional aqueous-phase synthesis method of the quantum dot. By utilizing an ultrasonic electrochemical method and controlling test parameters such as reaction pH, current size, current pulse time, ultrasonic time, reaction temperature and response time, the semiconductor quantum dot CdTe can be synthesized once without the N2 protection and the preparation of a precursor, so that the purposes that the grain size of a monodisperse quantum dot is controllable and the fluorescence-emission wavelength is continuously adjustable are achieved. The semiconductor quantum dot CdTe obtained by utilizing the method has the advantages that the fluorescence-emission wavelength range is 509nm-560nm, the maximal quantum dot yield is 36%, a possibility is provided for applying the ultrasonic electrochemistry to the synthesis of other quantum dots, and the method has important significances to the application of the fields of solar cells, photocatalysis and sensors.

Description

technical field [0001] The invention belongs to the field of material synthesis, in particular to a preparation method of water-soluble CdTe quantum dots. Background technique [0002] Semiconductor quantum dots are fluorescent semiconductor nanocrystals, generally spherical or quasi-spherical, with a particle size of 1-10nm, mainly composed of II-VI groups (such as CdTe, CdS, CdSe, etc.) or III-V groups ( InP, InAs) and IV-VI group (such as PbS, PbSe) elements. At present, the water-soluble quantum dots commonly used in biomedical research are mainly CdX (X=S, Se, Te). Semiconductor quantum dots have unique photoelectric properties, exhibit many physical and chemical properties different from macroscopic bulk materials and unique luminescent properties, and gradually play an increasingly important role in traditional and other emerging fields such as photoelectric conversion, biological imaging, and fluorescence analysis. big effect. [0003] At present, there are many m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C25B1/00
Inventor 石建军孟礼荣王圣朱俊杰
Owner ANHUI UNIV OF SCI & TECH
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