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Method for fixing water-soluble quantum dots by sol-gel

A water-soluble, quantum dot technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as insufficient stability, low luminous efficiency, and reduced fluorescence intensity, and achieve good optical properties and stability, and good optical flux. Transparency and high luminous efficiency

Inactive Publication Date: 2011-11-09
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Quantum dots synthesized in water phase are prone to agglomeration in air at room temperature, and their stability is not good enough, which limits the application of water-soluble quantum dots
In 2001, the work of Mulvany et al. (Selvan et al. Adv. Mater. 2001, 13: 985-988) took an important step in immobilizing quantum dots in a glass matrix, but the immobilized quantum dots have a low Luminous efficiency (about 10%), and its fluorescence intensity decreased by nearly half within a day, indicating that the quantum dots were not stably fixed in the glass matrix
Gerion et al. (Gerion et al.J.Phys.Chem.B 2001, 105:8861-8871) successfully immobilized CdSe quantum dots in silicon nanoparticles with a luminous efficiency as high as 18%, but the method they used was too complicated , the operation is more cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix 3-aminopropyl-trimethoxysilane (APS) and methanol at a molar ratio of 1:45, take 10 mL of the mixture and place it in a 50 mL (diameter 4.5 em) polytetrafluoroethylene beaker, add 2 mL of ultrapure water (Resistance 18.2MΩ), stir at room temperature for 1h to accelerate the hydrolysis of 3-aminopropyl-trimethoxysilane; use PARAFILM sealing film to seal the polytetrafluoroethylene beaker, and perforate several small holes on the sealing film to facilitate The methanol was volatilized, and then the polytetrafluoroethylene beaker was placed in a 28°C incubator for 55 hours; the polytetrafluoroethylene beaker was taken out, and 1 mL of -5 mol / L thioglycolic acid stabilized water-soluble CdTe quantum dots and 0.3mL ion solution (take 2.5mL 0.8mol / L CdCl 2 Put the solution in a 100mL volumetric flask, add 60mL ultrapure water, then add 0.29mL mercaptoacetic acid, then use 1.0mol / L NaOH to adjust the pH of the solution to 11, and set the volume to 100mL to obtain an ionic ...

Embodiment 2

[0024] Mix 3-aminopropyl-trimethoxysilane (APS) and methanol at a molar ratio of 1:48, take 10 mL of the mixture and place it in a 50 mL (diameter 4.5 cm) polytetrafluoroethylene beaker, add 2 mL of ultrapure water (Resistance 18.2MΩ), stir at room temperature for 1h to accelerate the hydrolysis of 3-aminopropyl-trimethoxysilane; use PARAFILM sealing film to seal the polytetrafluoroethylene beaker, and perforate several small holes on the sealing film to facilitate The methanol was volatilized, and then the polytetrafluoroethylene beaker was placed in a 30°C incubator for 50 hours; the polytetrafluoroethylene beaker was taken out, and 1 mL of -4 mol / L thioglycolic acid stabilized water-soluble CdTe quantum dots and 0.25mL ion solution (take 2.5mL 0.8mol / L CdCl 2 Put the solution in a 100mL volumetric flask, add 60mL of ultrapure water, then add 0.37mL of thioglycolic acid, then use 1.0mol / L NaOH to adjust the pH of the solution to 12, and set the volume to 100mL to obtain an i...

Embodiment 3

[0026] Mix 3-aminopropyl-trimethoxysilane (APS) and methanol at a molar ratio of 1:50, take 10 mL of the mixture and place it in a 50 mL (diameter 4.5 cm) polytetrafluoroethylene beaker, add 2 mL of ultrapure water (Resistance 18.2MΩ), stir at room temperature for 1h to accelerate the hydrolysis of 3-aminopropyl-trimethoxysilane; use PARAFILM sealing film to seal the polytetrafluoroethylene beaker, and perforate several small holes on the sealing film to facilitate The methanol was volatilized, and then the polytetrafluoroethylene beaker was placed in a 33°C incubator for 48 hours; the polytetrafluoroethylene beaker was taken out, and 1 mL of -4 mol / L thioglycolic acid stabilized water-soluble CdTe quantum dots and 0.3mL ion solution (take 2.5mL 0.8mol / L CdCl 2 Put the solution in a 100mL volumetric flask, add 60mL ultrapure water, then add 0.34mL mercaptoacetic acid, then use 1.0mol / L NaOH to adjust the pH of the solution to 13, and set the volume to 100mL to obtain an ionic ...

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PUM

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Abstract

A process of sol-gel fixing water-soluble quantum dots relates to a semi-conductor nano particle. A process of sol-gel fixing water-soluble quantum dots which has simple operation, can rapidly realize the fixture of water-soluble quantum dots and can keep the luminous property of quantum dots is provided. A gel film which is fixed with water-soluble quantum dots is prepared through mixing 3-aminopropyl-trimethoxy silane and methyl alcohol to obtain mixing solution A, mixing evenly CdC12 and mercaptoacetic acid, regulating the pH of solution with NaOH to obtain solion B, taking the mixing solution A into a container and adding ultrapure water, stirring to hydrolyze 3-amino propyl-trimethoxy silane to obtain mixing solution C, sealing the mouth of the container which holds the mixing solution C, punching on the sealing film, making the container which holds the mixing solution B constant temperature, taking the container which holds the mixing solution and adding water-soluble quantum dots and solion B to obtain mixing solution D, and finally obtaining the gel film which is fixed with water-soluble quantum dots after making the container which holds the mixing solution C constant temperature.

Description

technical field [0001] The invention relates to a semiconductor nanoparticle (quantum dot), in particular to a method for fixing water-soluble quantum dots by sol-gel. Background technique [0002] Semiconductor nanoparticles, also known as quantum dots (Quantum Dots, QDs), are mainly nanocrystals composed of II-VI group elements (such as CdSe, CdTe, CdS, ZnSe, etc.) and III-V group elements (such as InP, InAs, etc.) , the current study is mainly CdX (X = S, Se, Te). Due to the small particle size of quantum dots, electrons and holes are quantum-confined, and the continuous energy band becomes a discrete energy level structure with molecular characteristics. Therefore, the optical behavior is similar to that of some organic molecules (such as polycyclic aromatic hydrocarbons) and can emit fluorescence. Quantum dots have the characteristics of wide excitation spectrum, narrow emission spectrum (half-peak width less than 40nm), the wavelength of the fluorescence emission peak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02
Inventor 陈曦王旭东林志杰
Owner XIAMEN UNIV
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