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A method for preparing near-infrared second-region fluorescent silver sulfide quantum dots in aqueous phase

A water-phase preparation, near-infrared technology, applied in chemical instruments and methods, luminescent materials, nano-optics, etc., can solve the problems of low fluorescence quantum yield of quantum dots, difficult to guarantee colloidal stability, etc. Short cycle times and mild conditions

Active Publication Date: 2021-06-22
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The silver sulfide obtained in this way is hydrophobic and needs to be transferred to the water phase by various means before application, and its colloidal stability in water is still difficult to guarantee
At present, there are still few reports on the method of directly preparing silver sulfide quantum dots in the aqueous phase, and the fluorescence quantum yield of the prepared quantum dots is low, and the fluorescence emission wavelength is usually less than 1000nm

Method used

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  • A method for preparing near-infrared second-region fluorescent silver sulfide quantum dots in aqueous phase
  • A method for preparing near-infrared second-region fluorescent silver sulfide quantum dots in aqueous phase
  • A method for preparing near-infrared second-region fluorescent silver sulfide quantum dots in aqueous phase

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specific Embodiment 1

[0025] A method for preparing fluorescent silver sulfide quantum dots in the second near-infrared region in an aqueous phase, comprising the following steps:

[0026] Step 1: Add the cationic surfactant into the water and heat it until it is completely dissolved, then lower the aqueous solution of the cationic surfactant to (25-35)°C; wherein the cationic surfactant is cetyltrimethylammonium bromide ; The concentration of cationic surfactant is 1.1mM;

[0027] Step 2: Slowly add sodium sulfide solution into the cationic surfactant aqueous solution obtained in step 1 and stir evenly, then add silver nitrate solution and stir evenly; wherein, the molar ratio of sodium sulfide and silver nitrate is 0.45:1; vulcanization The concentration of sodium is 0.9mM;

[0028] Step 3: Heat the solution obtained in Step 2 to 90°C and react for 30 minutes to obtain an aqueous solution of fluorescent silver sulfide quantum dots in the second near-infrared region.

[0029] The advantages of t...

specific Embodiment 2

[0032] A method for preparing fluorescent silver sulfide quantum dots in the second near-infrared region in an aqueous phase, comprising the following steps:

[0033] Step 1: Add the cationic surfactant into the water and heat it until it is completely dissolved, then lower the aqueous solution of the cationic surfactant to (25-35)°C; wherein the cationic surfactant is cetyltrimethylammonium bromide ; The concentration of cationic surfactant is 100mM;

[0034] Step 2: Slowly add sodium sulfide solution into the cationic surfactant aqueous solution obtained in step 1 and stir evenly, then add silver nitrate solution and stir evenly; wherein, the molar ratio of sodium sulfide and silver nitrate is 0.45:1; vulcanization The concentration of sodium is 0.9mM;

[0035] Step 3: Heat the solution obtained in Step 2 to 90°C and react for 30 minutes to obtain an aqueous solution of fluorescent silver sulfide quantum dots in the second near-infrared region.

[0036] The advantages of t...

specific Embodiment 3

[0039] A method for preparing fluorescent silver sulfide quantum dots in the second near-infrared region in an aqueous phase, comprising the following steps:

[0040] Step 1: Add the cationic surfactant into the water and heat it until it is completely dissolved, then lower the aqueous solution of the cationic surfactant to (25-35)°C; wherein the cationic surfactant is cetyltrimethylammonium bromide ; The concentration of cationic surfactant is 0.55mM;

[0041] Step 2: Slowly add sodium sulfide solution into the cationic surfactant aqueous solution obtained in step 1 and stir evenly, then add silver nitrate solution and stir evenly; wherein, the molar ratio of sodium sulfide and silver nitrate is 0.45:1; vulcanization The concentration of sodium is 0.9mM;

[0042]Step 3: Heat the solution obtained in Step 2 to 90°C and react for 30 minutes to obtain an aqueous solution of fluorescent silver sulfide quantum dots in the second near-infrared region.

[0043] The advantages of t...

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Abstract

The invention discloses a method for preparing near-infrared two-zone fluorescent silver sulfide quantum dots in water phase, which comprises the following steps: Step 1: firstly add a cationic surfactant into water and heat until it is completely dissolved, and then reduce the aqueous solution of the cationic surfactant to (25~35)°C; Step 2: Slowly add the sodium sulfide solution into the cationic surfactant aqueous solution obtained in Step 1 and stir evenly, then add the silver nitrate solution and stir evenly; Step 3: Add the solution obtained in Step 2 Heating to (35-100)°C, reacting to obtain an aqueous solution of fluorescent silver sulfide quantum dots in the second near-infrared region. The invention has the advantages of simple preparation method, mild conditions, no need for inert gas protection, good repeatability, and easy amplification; the prepared silver sulfide quantum dot has good water solubility, photobleaching resistance, and high fluorescence intensity in the second near-infrared region.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for preparing near-infrared second-region fluorescent silver sulfide quantum dots directly in water. Background technique [0002] Due to its low price, easy operation and real-time imaging, optical imaging has become an important tool for life science research and medical applications. Traditional near-infrared fluorescent probes are usually located in the near-infrared region, and their fluorescence emission wavelength is less than 1000nm. Since the autofluorescence of organisms and the scattering of light by biological tissues increase as the wavelength decreases, these fluorescent probes in the near-infrared region can achieve better tissue penetration depth to a certain extent, but their imaging results Its spatial resolution is poor, and it is easily interfered by the autofluorescence of the living body, so its application in the field of medical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/58B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/582
Inventor 陆峰范曲立钱稳申翔朱修洋黄维
Owner NANJING UNIV OF POSTS & TELECOMM
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