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A method for rapidly preparing water-soluble quantum dots

A water-soluble, quantum dot technology, applied in chemical instruments and methods, luminescent materials, nanotechnology, etc., to achieve the effects of simple equipment, easy operation and low cost of raw materials

Active Publication Date: 2019-01-25
芜湖启博知识产权运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for rapidly preparing water-soluble quantum dots
  • A method for rapidly preparing water-soluble quantum dots

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preparation example Construction

[0022] On the basis of in-depth research on the prior art, the applicant improved the traditional preparation method and proposed a method for rapidly preparing water-soluble quantum dots, which specifically includes the following steps:

[0023] Step 1: Add the cadmium salt solution and the sulfhydryl ligand into the aqueous solution separately, and mix them uniformly to obtain a mixed solution, wherein the molar ratio of the sulfhydryl ligand and cadmium ion is 2 to 4:1;

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

[0025] Step 3: Dilute the cadmium telluride precursor solution 8 to 16 times with an aqueous solution and heat it to quickly obtain wate...

Embodiment 1

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

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

Embodiment 2

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

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

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Abstract

The invention discloses a method for rapidly preparing water-soluble quantum dots, which comprises the following steps: respectively adding cadmium salt solution and mercapto ligands into an aqueous solution, and mixing them uniformly to obtain a mixed solution, wherein the moles of mercaptopropionic acid and cadmium chloride The ratio is 2 to 4:1; adjust the pH value of the mixed solution to 9 to 11, pass nitrogen gas for more than 30 minutes, then add sodium telluride hydride aqueous solution, and mix evenly to obtain a cadmium telluride precursor solution, wherein the sodium telluride hydride and cadmium ions The molar ratio is 0.1-0.2:1; the cadmium telluride precursor solution is diluted with an aqueous solution and heated to obtain water-soluble cadmium telluride quantum dots. The method of the invention can be used to rapidly prepare the water-soluble quantum dots, and it only takes 1 hour to obtain the red cadmium telluride quantum dots at the fastest. The obtained cadmium telluride quantum dots have a 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 (QDs), usually a kind of 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. 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, chemistry and biological detection, medicine, etc., realizing biological cell fluorescent labeling, in vivo animal imaging, quantum dot fluorescent coding, sensitive materials, optoelectronic devices, ion det...

Claims

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Application Information

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Patent Type & Authority Patents(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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