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Preparation method of photoluminescence ionic liquid containing carbon quantum dots

An ionic liquid and photoluminescence technology, applied in the fields of luminescent materials, chemical instruments and methods, inks, etc., can solve the problems of fluorescent ionic liquids lacking carbon quantum dots, and achieve improved fluorescence quantum yield, complete water removal, and high efficiency. Design effects

Active Publication Date: 2016-09-28
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the lack of a simple and feasible method for preparing fluorescent ionic liquids containing carbon quantum dots and applying them to photoluminescent inks in the existing field of carbon quantum dots, the present invention provides a method for photoluminescent ionic liquids containing carbon quantum dots. Preparation

Method used

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  • Preparation method of photoluminescence ionic liquid containing carbon quantum dots
  • Preparation method of photoluminescence ionic liquid containing carbon quantum dots
  • Preparation method of photoluminescence ionic liquid containing carbon quantum dots

Examples

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Embodiment 1

[0024] According to the molar ratio of citric acid and 1-aminopropyl-3-methylimidazolium bromide as 1:1 (i.e. 1g citric acid + 1.05g 1-aminopropyl-3-methylimidazolium bromide) ultrasonic dispersion in 25mL ultra In pure water, the above mixture was heated and distilled with stirring in an oil bath, and the ultrapure water was removed to obtain a jelly. 240 ° C high temperature pyrolysis for 2 hours, the reaction solution was naturally cooled to room temperature, 25mL of ultrapure water was added and the dispersion was placed in a 1000Da dialysis bag for dialysis, and the ultrapure water was changed outside the dialysis bag every day to obtain ionic liquid-modified , the anion is Br - The water-soluble carbon quantum dots have a fluorescence quantum yield of Φ=6.16%.

Embodiment 2

[0026] On the basis of Example 1, the mol ratio of citric acid and 1-aminopropyl-3-methylimidazolium bromide is changed to 1:3 (i.e. 1g citric acid+3.15g 1-aminopropyl-3-methyl imidazolium bromide), and other conditions unchanged, the obtained carbon quantum dot fluorescence quantum yield Φ=10.63%.

Embodiment 3

[0028] On the basis of Example 1, the mol ratio of citric acid and 1-aminopropyl-3-methylimidazolium bromide is changed to 1:5 (i.e. 1g citric acid+5.25g 1-aminopropyl-3-methyl imidazolium bromide), and other conditions unchanged, the obtained carbon quantum dot fluorescence quantum yield Φ=6.28%.

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Abstract

The invention discloses a preparation method of photoluminescence ionic liquid containing carbon quantum dots. Water soluble carbon quantum dots modified by imidazole ionic liquid are prepared through a one-step pyrolysis method and mixed with hydrophobic ionic liquid with negative ions being N[CF3SO2]2-, NTf2- for short or PF6-, and photoluminescence ionic liquid containing the carbon quantum dots is obtained through one-step synergy phase transfer and ion exchange. The carbon quantum dot / ionic liquid composite system can be used as multipurpose photoluminescence ink and applied to writhing brushes, fountain pens, ball-point pens, gel pens and seals. Due to the fact that the ionic liquid is difficult to volatilize and has good chemical stability and heat stability and the carbon quantum dots have stable photoluminescence property and good biocompatibility, compared with existing photoluminescence ink, the ionic liquid used as ink has the advantages of being environmentally friendly, resistant to high temperature and the like.

Description

technical field [0001] The invention relates to a preparation method of a photoluminescent ionic liquid containing carbon quantum dots, belonging to the field of new materials. Background technique [0002] Carbon quantum dots generally refer to a kind of nano-carbon with a size of less than 10 nm, a quasi-spherical structure, and stable luminescence. As a new star in the carbon nanomaterial family, carbon quantum dots have good water solubility, high luminescence stability, and no photobleaching. Compared with traditional organic dyes and semiconductor quantum dots, carbon quantum dots overcome the shortcomings of organic dyes such as unstable luminescence and easy photobleaching, and overcome the shortcomings of semiconductor quantum dots such as low biocompatibility and strong cytotoxicity, and It is easy to realize surface functionalization, so it has good application prospects in the fields of biochemical sensing, cell imaging, environmental monitoring, heavy metal det...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/65C09D11/50
CPCC09D11/50C09K11/025C09K11/65
Inventor 李洪光孙晓峰
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI