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Quaternary water-soluble quantum dots as well as preparation method and application thereof

A quantum dot, water-soluble technology, applied in chemical instruments and methods, measurement devices, nanotechnology for materials and surface science, etc., can solve the problems of low quantum yield and poor biocompatibility of quantum dots, Achieve high crystallinity and uniform size distribution

Active Publication Date: 2018-10-16
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the main purpose of the present invention is to provide a quaternary water-soluble quantum dot, which solves the problems of low quantum yield and poor biocompatibility of quantum dots in the prior art

Method used

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  • Quaternary water-soluble quantum dots as well as preparation method and application thereof
  • Quaternary water-soluble quantum dots as well as preparation method and application thereof
  • Quaternary water-soluble quantum dots as well as preparation method and application thereof

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Embodiment 1

[0036] A preparation method of quaternary water-soluble quantum dots, the method is realized through the following steps:

[0037] Step 1: Mix and stir 5ml of 0.02mol / L silver nitrate aqueous solution, 1mL of 0.05mol / L indium nitrate aqueous solution, and 6mL of 0.02mol / L gallium nitrate aqueous solution, and then add 1.5mL of 0.2mol / L Glu- Cys-Pro oligopeptide aqueous solution and 4.5mL 0.1mol / L sodium citrate aqueous solution are mixed to form a coating agent aqueous solution and stirred evenly to obtain a precursor solution;

[0038] Step 2, adding sodium hydroxide to the precursor solution obtained in step 1 to adjust the pH to 9 to obtain an alkaline precursor solution;

[0039]Step 3, adding 7.5mL of 0.1mol / L aqueous solution of thioacetamide to the alkaline precursor solution obtained in step 2 and stirring evenly to obtain a mixed aqueous solution containing the alkaline precursor and thioacetamide;

[0040] Step 4, transfer the mixed aqueous solution containing the a...

Embodiment 2

[0042] A preparation method of quaternary water-soluble quantum dots, the method is realized through the following steps:

[0043] Step 1, mix and stir 5ml 0.02mol / L silver nitrate aqueous solution, 1mL 0.05mol / L indium nitrate aqueous solution, 6mL 0.02mol / L gallium sulfate aqueous solution, and then add 1.5mL 0.2mol / L Glu- Cys-Pro oligopeptide aqueous solution and 4.5mL 0.1mol / L sodium citrate aqueous solution are mixed to form a coating agent aqueous solution and stirred evenly to obtain a precursor solution;

[0044] Step 2, adding sodium hydroxide with a concentration of 1 mol / mL to the precursor solution obtained in step 1 to adjust the pH to 9 to obtain an alkaline precursor solution;

[0045] Step 3, adding 15mL of 0.05mol / L thiourea aqueous solution to the alkaline precursor solution obtained in step 2 and stirring evenly to obtain a mixed aqueous solution containing the alkaline precursor and thiourea;

[0046] Step 4, transfer the mixed aqueous solution containing ...

Embodiment 3

[0048] A preparation method of quaternary water-soluble quantum dots, the method is realized through the following steps:

[0049] Step 1: Mix and stir 5ml of 0.02mol / L silver nitrate aqueous solution, 1.2mL of 0.05mol / L indium nitrate aqueous solution, and 7.5mL of 0.02mol / L gallium nitrate aqueous solution, and then add 8mL of 0.05mol / L Glu -Cys-Pro oligopeptide aqueous solution and 2.65mL 0.2mol / L sodium citrate aqueous solution are mixed to form a coating agent aqueous solution and stirred evenly to obtain a precursor solution;

[0050] Step 2, adding sodium hydroxide with a concentration of 1 mol / mL to the precursor solution obtained in step 1 to adjust the pH to 9 to obtain an alkaline precursor solution;

[0051] Step 3, adding 10.33mL of 0.09mol / L sodium sulfide aqueous solution to the alkaline precursor solution obtained in step 2 and stirring evenly to obtain a mixed aqueous solution containing the alkaline precursor and sodium sulfide;

[0052] Step 4, transfer the...

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Abstract

The invention discloses quaternary water-soluble quantum dots. Each quantum dot comprises core AgGaInS and a coating agent coating the surface of the core AgGaInS. The invention also discloses a preparation method and application of the quantum dots. The quantum dots obtained by adopting a stepwise hydrothermal method have high crystallinity and uniform size distribution, a fluorescence peak has awide adjustable range and is located between 450 and 750 nm, and a fluorescence quantum yield is up to 25% or more; and in addition, an oligopeptide containing biological-activity macromolecules is selected as the surface coating agent, and therefore the quantum dots can be well applied to photoelectric devices and biomarkers.

Description

technical field [0001] The invention relates to the field of quantum dot materials, in particular to a quaternary water-soluble quantum dot and its preparation method and application. Background technique [0002] Semiconductor nanocrystals (Nanocrystals, NCs), also known as quantum dots (Quantum dots, QDs), are a semiconductor material that is limited in three dimensions of space; quantum dots have been studied so far, and various types of structures have emerged and materials; from the structural division, there are core-shell structure, alloy structure, heterostructure, etc.; in terms of material types, there are II-VI groups (such as CdS), III-V groups (such as InP), etc.; these types of quantum It has been developed for a long time, so the synthesis process is very mature, but it contains Class A heavy metal elements, such as Cd, Hg, etc., so it has caused huge damage to the biological environment. [0003] Successfully synthesized AgInS since 2007 2 Quantum dots star...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/62B82Y20/00B82Y30/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/025C09K11/621G01N21/6486G01N2021/6497
Inventor 宋江鲁奇张炎代义文于跃李欢姚博周慧鑫秦翰林许小亮朱立新贾秀萍周峻高永晟
Owner XIDIAN UNIV