Lanthanide rare earth ytterbium-doped silver sulfide quantum dots, a preparing method thereof and applications of the quantum dots

A technology of lanthanide rare earths and silver sulfide, applied in chemical instruments and methods, zinc sulfide, luminescent materials, etc., can solve problems such as difficult to be widely used, and achieve the effect of simple preparation process, good biocompatibility, and uniform size

Active Publication Date: 2017-06-20
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, most of the current quantum dots are heavy metal sulfide selenide quantum dot

Method used

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  • Lanthanide rare earth ytterbium-doped silver sulfide quantum dots, a preparing method thereof and applications of the quantum dots
  • Lanthanide rare earth ytterbium-doped silver sulfide quantum dots, a preparing method thereof and applications of the quantum dots
  • Lanthanide rare earth ytterbium-doped silver sulfide quantum dots, a preparing method thereof and applications of the quantum dots

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Embodiment 1

[0034] A preparation method for lanthanide rare earth ytterbium doped silver sulfide quantum dots, comprising the following steps:

[0035] 1) Preparation of the precursor silver diethylthiocarbamate: Dissolve 20mmol of sodium diethylthiocarbamate trihydrate and 20mmol of silver nitrate in 40ml of deionized water, stir magnetically under dark conditions, and react for 2 hours. , the reaction solution was centrifugally filtered to obtain the product, and the product was washed with water and absolute ethanol for 4 times, and then dried in an oven at 70°C to obtain the precursor silver diethylthiocarbamate.

[0036] 2) Preparation of near-infrared silver sulfide quantum dots: Dissolve 0.2 mmol of the precursor silver diethylthiocarbamate in 12 mL of dodecyl mercaptan, stir for 20 min, mix well to obtain a clear solution, and heat the clear solution under argon to carry out For the reaction, the reaction temperature is 220° C., and the reaction time is 2 hours. After the reaction...

Embodiment 2

[0042] A preparation method for lanthanide rare earth ytterbium doped silver sulfide quantum dots, comprising the following steps:

[0043] 1) Preparation of the precursor silver diethylthiocarbamate: Dissolve 25mmol of sodium diethylthiocarbamate trihydrate and 25mmol of silver nitrate in 50ml of deionized water, stir magnetically under dark conditions, and react for 3 hours. , the reaction solution was centrifuged to obtain the product, and the product was washed with water and absolute ethanol for 6 times, and then dried in an oven at 65°C to obtain the precursor silver diethylthiocarbamate.

[0044] 2) Preparation of near-infrared silver sulfide quantum dots: the precursor silver diethylthiocarbamate 0.4mmol was dissolved in 25mL of dodecanethiol, stirred for 10min, mixed evenly to obtain a clear solution, and the clear solution was heated under argon to carry out For the reaction, the reaction temperature is 200° C., and the reaction time is 2 hours. After the reaction is...

Embodiment 3

[0049] A preparation method for lanthanide rare earth ytterbium doped silver sulfide quantum dots, comprising the following steps:

[0050] 1) Preparation of the precursor silver diethylthiocarbamate: Dissolve 25mmol of sodium diethylthiocarbamate trihydrate and 25mmol of silver nitrate in 40ml of deionized water, stir magnetically under dark conditions, and react for 3 hours. , the reaction solution was centrifuged to obtain the product, washed with water and absolute ethanol for 5 times, and then dried in an oven at 60°C to obtain the precursor silver diethylthiocarbamate.

[0051] 2) Preparation of near-infrared silver sulfide quantum dots: Dissolve 0.2 mmol of silver diethylthiocarbamate precursor in 20 mL of dodecanethiol, stir for 10 min, mix well to obtain a clear solution, and heat the clear solution under argon to carry out For the reaction, the reaction temperature is 200° C., and the reaction time is 2 hours. After the reaction is completed, the near-infrared silver...

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Abstract

The invention relates to lanthanide rare earth ytterbium-doped silver sulfide quantum dots, a preparing method thereof and applications of the quantum dots. The ytterbium-doped silver sulfide quantum dots are prepared by adopting silver sulfide quantum dots as a matrix, and by steps of doping Yb<3+> as an activating ion and growing a heterogeneous sulfur layer on the surfaces of the silver sulfide quantum dots. The chemical formula of the ytterbium-doped silver sulfide quantum dots is Ag2S:Yb<3+>. The preparing method includes 1) reacting sodium diethyldithiocarbamate trihydrate and silver nitrate to obtain a precursor; 2) dissolving the precursor into dodecanethiol, and heating and reacting the mixture to obtain the silver sulfide quantum dots; 3) mixing ytterbium acetate and olaquindox to obtain a ytterbium ion solution; 4) mixing sulfur powder and octadecene to obtain a sulfur solution; and 5) adding the silver sulfide quantum dots, the octadecene and the olaquindox into a reaction container, fully stirring the added materials, adding the ytterbium solution into the reaction container with existence of argon, reacting the mixture, then adding the sulfur solution, and reacting the mixture to obtain the lanthanide rare earth ytterbium-doped silver sulfide quantum dots. The lanthanide rare earth ytterbium-doped silver sulfide quantum dots have good photochemical performance and low toxicity.

Description

technical field [0001] The invention relates to the technical field of preparation of quantum dots, in particular to a lanthanide rare earth ytterbium-doped silver sulfide quantum dot and its preparation method and application. Background technique [0002] In recent years, molecular imaging technology has been developing day by day. Its application can improve the diagnosis level of diseases to the stage of molecular abnormalities, detect lesions at the molecular level, and directly observe a series of processes such as the cause, occurrence, and development of diseases in vivo, and observe Abnormal changes and characteristics of diseases at the genetic and molecular levels. As a key technology for molecular imaging, near-infrared fluorescence imaging is easy to operate, consumes less reagents, and has high sensing sensitivity to target molecules. It is a good method for functional imaging of biomolecules. Near-infrared (NIR) imaging depends on the fluorescent probe-near-i...

Claims

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Application Information

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IPC IPC(8): C09K11/77C01G9/08
CPCC01G9/08C01P2004/04C09K11/77
Inventor 夏冬林李力秦可朱昊周斌李启东
Owner WUHAN UNIV OF TECH
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