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Method for preparing water-soluble fluorescent silicon quantum dots by using hydrothermal process

A silicon quantum dot, water-soluble technology, applied in chemical instruments and methods, luminescent materials, silicon compounds, etc., can solve the problems of complex operation, poor water solubility, unfavorable large-scale synthesis, etc., and achieve simple synthesis operation, good reversibility, The effect of excellent optical characteristics

Active Publication Date: 2014-07-02
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are more complicated to operate, which is not conducive to large-scale synthesis; at the same time, because the surface of silicon quantum dots or silicon nanomaterials synthesized by some methods is mostly Si-H bonds, and their water solubility is poor, so in biomedical applications, it is necessary to use Its surface is modified with hydrophilic groups such as amino groups (J.H.Ahire, et.ACS Appl. Mater. Interfaces, 2012, 4, 3285-3292), etc., so it is necessary to develop simple and rapid preparation methods

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  • Method for preparing water-soluble fluorescent silicon quantum dots by using hydrothermal process
  • Method for preparing water-soluble fluorescent silicon quantum dots by using hydrothermal process
  • Method for preparing water-soluble fluorescent silicon quantum dots by using hydrothermal process

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Embodiment 1

[0029] A method for preparing water-soluble fluorescent silicon quantum dots by hydrothermal method, the specific steps are as follows:

[0030] 1. Add 8 mL of deionized water and 0.368 g of sodium citrate into a three-necked flask, stir and blow nitrogen for 20 minutes, inject 2 mL of 3-aminopropyltriethoxysilane, continue blowing nitrogen for 15 minutes, and then transfer to a hydrothermal reaction kettle The temperature was raised to 200° C. and reacted for 120 minutes to obtain a colorless and transparent silicon quantum dot solution.

[0031] 2. Transfer the obtained silicon quantum dot solution into a pretreated dialysis bag (the molecular weight cut-off of the dialysis bag is 1000) for dialysis. Seal the lower end of the pretreated dialysis bag with a dialysis clip, then inject the silicon quantum dot solution, seal the upper end with a dialysis clip, put it into a beaker filled with 2000ml deionized water for dialysis, and perform dialysis for the first time for 3 hour...

Embodiment 2

[0034] A method for preparing water-soluble fluorescent silicon quantum dots by hydrothermal method, the specific steps are as follows:

[0035]1. Add 8 mL of deionized water and 0.368 g of sodium citrate into a three-necked flask, stir and blow nitrogen gas for 20 minutes, and inject 2 mL of 3-aminopropyltrimethoxysilane (the mixture of 3-aminopropyltrimethoxysilane and sodium citrate The molar ratio of the substances is 9:1), the nitrogen gas was continuously fed for 15 minutes, and then transferred to a hydrothermal reaction kettle to raise the temperature to 200°C, and reacted for 120 minutes to obtain a colorless and transparent silicon quantum dot solution.

[0036] 2. Transfer the obtained silicon quantum dot solution into a pretreated dialysis bag (the molecular weight cut-off of the dialysis bag is 1000) for dialysis. Seal the lower end of the pretreated dialysis bag with a dialysis clip, then inject the silicon quantum dot solution, seal the upper end with a dialysis...

Embodiment 3

[0040] A method for preparing water-soluble fluorescent silicon quantum dots by hydrothermal method, the specific steps are as follows:

[0041] 1. Add 8 mL of deionized water to the three-necked flask, blow nitrogen gas for 30 minutes, inject 2 mL of 3-aminopropyltrimethoxysilane, and then add 0.235 g of NaBH 4 , continue to feed nitrogen, stir for 5 minutes, then transfer to a hydrothermal reaction kettle, raise the temperature to 200° C., and react for 120 minutes to obtain a silicon quantum dot solution.

[0042] 2. Transfer the obtained silicon quantum dot solution into a pretreated dialysis bag (the molecular weight cut-off of the dialysis bag is 1000) for dialysis. Seal the lower end of the pretreated dialysis bag with a dialysis clip, then inject the silicon quantum dot solution, seal the upper end with a dialysis clip, put it into a beaker filled with 2000ml deionized water for dialysis, and perform dialysis for the first time for 3 hours, then replace the deionized w...

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Abstract

The invention belongs to the technical field of the preparation methods of the nanomaterials and specifically discloses a method for preparing water-soluble fluorescent silicon quantum dots by using a hydrothermal process. The method comprises the steps of firstly introducing an amino silane and a reducing agent into a solvent in which nitrogen is introduced and mixing, continuing introducing the nitrogen for protection for a while, next, transferring to a hydrothermal reaction kettle, and heating for reacting for a while, thereby obtaining the fluorescent silicon quantum dots having excellent chemical properties. The method has the advantages of low raw material cost due to the adoption of the amino silane as a silicon source, simple operation steps, direction synthesis in water phase, easy large-scale production, and being green and environment; the obtained quantum dots have high quantum yield and excellent chemical characteristics, and are small in particle size, evenly in distribution, non-toxic, good in biocompatibility and acid resistance; besides, the quantum dots have pH sensitive characteristic in a certain range, and can be widely applied to the biochemical and biomedical sensing fields such as biochemical detection, drug analysis, cell and living imaging and targeting tracing and also can be used as photovoltaic conversion and light-emitting display materials.

Description

technical field [0001] The invention relates to the technical field of preparation methods of nanomaterials, in particular to a method for preparing water-soluble fluorescent silicon quantum dots by a hydrothermal method. Background technique [0002] Quantum dots are quasi-zero-dimensional nanomaterials with a diameter of 1-10nm, which have special luminescent properties. Quantum dots have high luminous intensity and good photochemical stability. Therefore, quantum dots are widely used in the fields of optoelectronic information and photonic devices. Human application prospects. Silicon quantum dots have attracted attention as a non-toxic, low-cost nanomaterial with high fluorescence and good biocompatibility, while in the earth's crust, silicon is the second most abundant element (only Second to oxygen), it provides a very abundant and cheap source for its application, and also provides convenient conditions for our large-scale synthesis. [0003] Researchers have used ...

Claims

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Application Information

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IPC IPC(8): C01B33/021C09K11/59B82Y40/00B82Y20/00
Inventor 何治柯冯燕铃吉邢虎
Owner WUHAN UNIV
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