Preparation method of water-soluble green fluorescent silicon quantum dot

A technology of green fluorescence and silicon quantum dots, applied in chemical instruments and methods, luminescent materials, silicon compounds, etc., can solve the problems of complex reaction process, low quantum yield, poor water solubility, etc., and achieve simplified process flow, quantum The effect of high productivity and cost reduction

Active Publication Date: 2016-06-22
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reaction conditions that some of these methods have are harsher, are difficult to realize under general conditions, and the reaction process that has is complicated, and raw material is not easy to get (Anderson, I.et; TheJournalofPhysicalChemistryC2012,116,3979-3987.), and what have is synthesized in organic phase, synthesizes Silicon quantum dots have poor water solubility, which is not easy for their application in biomedicine. There are also some synthetic silicon quantum dots (Si-H) with hydrogen groups on the surface, which have poor stability and poor water solubility (Tilley , R.D.et; AdvancedMaterials2006,18,2053-2056.), it is often necessary to carry out surface modification such as amino to increase its water solubility and improve practical applicability (Tilley, R.D.et, AngewandteChemie2005, 117(29), 4626-4630.)
At present, most silicon quantum dots have been synthesized for a long time, and the quantum yield is low, and the wavelength is relatively short (Zhang, J.; Yu, S.H., Nanoscale2014, 6(8), 4096-101.), therefore, a raw material is needed that is easy to A simple and convenient synthetic method

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  • Preparation method of water-soluble green fluorescent silicon quantum dot
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  • Preparation method of water-soluble green fluorescent silicon quantum dot

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Embodiment 1

[0025] A preparation method of water-soluble green fluorescent silicon quantum dots, the steps are:

[0026] 1) Add 0.768g of glucose and 8mL of deionized water to the flask, continuously feed nitrogen into the flask, stir to dissolve the glucose completely, then inject 2.5mL of 3-aminopropyltrimethoxysilane into the flask, stir to make 3 - Aminopropyltrimethoxysilane is completely dissolved, then add 100 μL 1mol / L sodium hydroxide solution to the flask, adjust the pH to 11, continue stirring for 10 minutes, stop feeding nitrogen, then place the flask in a constant temperature water bath, and heat After the constant temperature water bath reaches 60°C, continue to stir and react for 30 minutes, and quench the solution obtained after the reaction to room temperature (25±2), to obtain crude water-soluble green fluorescent silicon quantum dots;

[0027] 2) Place a dialysis bag with a molecular weight cut-off of 1000 in a mixed solution with a concentration of NaHCO3 of 2% w / v (g / ...

Embodiment 2

[0044] A preparation method of water-soluble green fluorescent silicon quantum dots, the steps are:

[0045] 1) Add 0.768g of glucose and 8mL of deionized water into the flask, continuously feed nitrogen into the flask, stir to dissolve the glucose completely, then inject 2.5mL of 3-aminopropyltriethoxysilane into the flask, stir to make 3-Aminopropyltrimethoxysilane is completely dissolved, then add 1mol / L sodium hydroxide solution to the flask, adjust the pH to about 11, make the system in a strong alkaline environment, continue to stir for 10min, stop feeding nitrogen , and then placed the flask in a constant temperature water bath, heated the constant temperature water bath to 60°C, continued to stir for 30 minutes, and quenched the solution obtained after the reaction to room temperature (25 ± 2), to obtain the crude product of water-soluble green fluorescent silicon quantum dots;

[0046] 2) Place a dialysis bag with a molecular weight cut-off of 1000 in a mixed solution...

Embodiment 3

[0049] A preparation method of water-soluble green fluorescent silicon quantum dots, the steps are:

[0050] 1) Add 0.682g of sodium ascorbate and 8mL of deionized water into the flask, feed nitrogen into the flask, stir until the sodium ascorbate is completely dissolved, then inject 2.5mL of 3-aminopropyltrimethoxysilane into the flask, and stir until 3- Aminopropyltrimethoxysilane is completely dissolved, nitrogen gas is continuously introduced, and then 1mol / L sodium hydroxide solution is added to the flask to adjust the pH to about 11, so that the system is in a strong alkaline environment, and continue to stir for 10 minutes , stop feeding nitrogen, then put the flask into a constant temperature water bath, heat the constant temperature water bath to 60°C, continue to stir for 30 minutes, and quench the solution obtained after the reaction to room temperature (25 ± 2), to obtain water-soluble green fluorescence Crude silicon quantum dots;

[0051] 2) Place a dialysis bag...

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Abstract

The invention discloses a preparation method of a water-soluble green fluorescent silicon quantum dot. According to the method, glucose or sodium ascorbate is adopted as a reducing agent (protecting agent); 3-aminopropyltrimethoxysilane or 3-aminopropyltriethoxysilane is adopted as a silicon source; the silicon quantum dot is directly synthesized by adopting a water bath method (the temperature of a water bath is 50 to 80 DEG C); the synthesized silicon quantum dot is purified, so as to obtain the high-purity silicon quantum dot. The method is simple and easily feasible; a current process flow for synthesizing the silicon quantum dot is simplified drastically; the cost for synthesizing the silicon quantum dot is decreased drastically; the heating by the water bath lasts for tens of minutes, so that the water-soluble green fluorescent silicon quantum dot which is nontoxic, is good in water solubility, adjustable in wave length and high in quantum yield can be obtained.

Description

technical field [0001] The invention relates to the technical field of preparation of nanomaterials, in particular to a preparation method of water-soluble green fluorescent silicon quantum dots. Background technique [0002] Silicon quantum dots are quantum dots with special properties. It not only has the basic properties of general quantum dots such as: narrow fluorescence emission spectrum, wide excitation spectrum range, good photostability, etc., but also has high fluorescence quantum yield, good water solubility, The emission wavelength is adjustable, non-toxic, non-polluting and other characteristics. Based on the quantum effect of quantum dots, silicon quantum dots have broad application prospects in light-emitting devices, solar cells, optical biomarkers and other fields. Based on the non-toxic and non-polluting properties of silicon quantum dots, it also has great application prospects in biomedicine, and can be used for medical living heavy metal ion detection, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59C01B33/021B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C01B33/021C01P2002/84C01P2004/04C09K11/59
Inventor 何治柯王佳慧吉邢虎
Owner WUHAN UNIV
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