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Positively charged water-soluble cadmium telluride quantum dot preparation method

A cadmium telluride quantum dot, water-soluble technology, applied in chemical instruments and methods, nanotechnology, nano-optics and other directions, to achieve the effects of simple equipment, easy operation and low cost of raw materials

Active Publication Date: 2017-03-29
芜湖启博知识产权运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of preparation method of fast preparation water-soluble quantum dot, to solve the problem of traditional preparation water-soluble quantum dot preparation rate

Method used

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  • Positively charged water-soluble cadmium telluride quantum dot preparation method
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preparation example Construction

[0022] On the basis of in-depth research on the existing technology, the applicant improves the traditional preparation method and proposes a preparation method of positively charged water-soluble cadmium telluride quantum dots, which specifically includes the following steps:

[0023] Step 1, respectively adding cadmium salt solution and mercapto ligands into the aqueous solution, and mixing uniformly to obtain a mixed solution, wherein the molar ratio of mercapto ligands to cadmium ions is 2 to 4:1;

[0024] Step 2. Adjust the pH value of the mixed solution obtained in Step 1 to 9-11, pass nitrogen gas for more than 30 minutes, then add an aqueous solution of sodium telluride hydride, and mix evenly to obtain a cadmium telluride precursor solution, wherein sodium hydride telluride and Cd 2+ The molar ratio of cadmium ions is 0.1-0.2:1, and the molar concentration of cadmium ions is 8-16mM;

[0025] Step 3: Dilute the cadmium telluride precursor solution by 8 to 16 times with...

Embodiment 1

[0029] Rapid preparation of mercaptopropionic acid modified cadmium telluride quantum dots (the concentration of cadmium chloride is 16mM, and the cadmium telluride precursor is diluted 16 times)

[0030] First, add 20ml of 0.1M cadmium chloride aqueous solution and 0.4mL of mercaptopropionic acid solution into 100mL of water, and stir evenly. The pH value of the mixed solution was adjusted to 9 with a 1.0M aqueous sodium hydroxide solution, and then nitrogen gas was passed for 30 minutes. After injecting 0.6ml of the 0.667M sodium hydride telluride solution just prepared, the precursor solution of cadmium telluride can be obtained. In this embodiment, the molar ratio of cadmium chloride: mercaptopropionic acid: sodium hydride telluride is 1:2.4:0.2, and the concentration of cadmium ions is 16 mM. Take 10mL of the precursor solution and add 150mL of water to stir evenly. After heating for a period of time, water-soluble cadmium telluride quantum dots of different sizes are ob...

Embodiment 2

[0035] Rapid preparation of mercaptopropionic acid modified cadmium telluride quantum dots (the concentration of cadmium nitrate is 8mM, and the cadmium telluride precursor is diluted 8 times)

[0036] First, add 10ml of 0.1M cadmium nitrate aqueous solution and 0.17mL of mercaptopropionic acid solution into 110mL of water, and stir evenly. The pH value of the mixed solution was adjusted to 9 with a 1.0M aqueous sodium hydroxide solution, and then nitrogen gas was passed for 30 minutes. After injecting 0.3ml of the 0.667M sodium hydride telluride solution just prepared, the precursor solution of cadmium telluride can be obtained. In this embodiment, the molar ratio of cadmium chloride: mercaptopropionic acid: sodium hydride telluride is 1:2.4:0.2, and the concentration of cadmium ions is 8 mM. Take 20mL of the precursor solution and add 140mL of water to stir evenly. After heating for a period of time, water-soluble cadmium telluride quantum dots of different sizes are obtain...

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Abstract

The invention discloses a positively charged water-soluble cadmium telluride quantum dot preparation method, which comprises: respectively adding a cadmium salt solution and a mercapto ligand to an aqueous solution, and uniformly mixing to obtain a mixed solution, wherein a molar ratio of mercaptopropionic acid to cadmium chloride is 2-4:1; adjusting the pH value of the mixed solution to 9-11, introducing nitrogen for more than 30 min, adding a sodium hydrogen telluride aqueous solution, and uniformly mixing to obtain a cadmium telluride precursor solution, wherein a molar ratio of sodium hydrogen telluride to cadmium ions is 0.1-0.2:1; and diluting the cadmium telluride precursor solution by using an aqueous solution, and heating to obtain the water-soluble cadmium telluride quantum dots. With the method of the present invention, the water-soluble quantum dots can be prepared quickly, the fastest red cadmium telluride quantum dot obtaining time is only 1 h, and the obtained cadmium telluride quantum dots have the good lattice structure.

Description

technical field [0001] The invention relates to the field of preparation of water-soluble quantum dots, in particular to a rapid preparation method of water-soluble cadmium telluride quantum dots. Background technique [0002] Quantum dots (quantum dots, QDs), usually a nanocrystal composed of II-VI or III-V elements, can absorb excitation light to produce fluorescence. As a luminescent material, quantum dots have many advantages, such as good optical stability, wide excitation spectrum and narrow emission spectrum, good biocompatibility, and adjustable fluorescence spectrum, etc. Due to these superior fluorescent properties, quantum dots are widely used in various fields. With the deepening of research, quantum dots have been successfully used in many fields such as optics, pharmacy, chemical and biological detection, medicine, etc., and have realized biological cell fluorescent labeling, animal live imaging, quantum dot fluorescent coding, sensitive materials, photoelectr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/883
Inventor 江源屠凡王逸飞张志维
Owner 芜湖启博知识产权运营有限公司
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