Method for preparing carbon quantum dots by virtue of polyethyleneimine decomposition

A polyethyleneimine, carbon quantum dot technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of cumbersome preparation steps, increased cytotoxicity, poor product stability, etc., and achieves wide application range, simple preparation process, Easy-to-operate effects

Active Publication Date: 2015-10-14
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing carbon quantum dots based on the decomposition of polyethyleneimine, to solve the problem that the existing composite methods of polyethyleneimine and organic fluorescent dyes or quantum dots often have cumbersome preparation steps, increased cytotoxicity and Technical problems of poor product stability

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  • Method for preparing carbon quantum dots by virtue of polyethyleneimine decomposition
  • Method for preparing carbon quantum dots by virtue of polyethyleneimine decomposition
  • Method for preparing carbon quantum dots by virtue of polyethyleneimine decomposition

Examples

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Embodiment 1

[0022] Disperse 200mg of polyethyleneimine in 40ml of ethanol, stir well, transfer the solution to a reaction kettle, raise the temperature to 200°C for 20h, and cool to room temperature. Using column chromatography, the product is separated and purified to obtain nitrogenized carbon quantum dots that emit yellow-green light under the excitation of 365nm ultraviolet light, such as figure 1 Shown (where, PLE is the photoluminescence excitation spectrum; PL is the photoluminescence spectrum). The Fourier transform infrared spectra of polyethyleneimine before reaction and carbon quantum dots after reaction are as follows: figure 2 shown. The prepared nitriding carbon quantum dot ethanol solution showed strong yellow-green fluorescence under ultraviolet light, and the photoluminescence spectra under different excitation wavelengths were as follows: image 3 shown. Its maximum excitation wavelength is 430nm, and the maximum fluorescence emission wavelength at this time is 514nm...

Embodiment 2

[0024] Disperse 50mg of polyethyleneimine in 40ml of ethanol, stir well, transfer the solution to a reaction kettle, raise the temperature to 200°C for 20h, and cool to room temperature. The product is separated and purified by column chromatography to obtain nitrogenized carbon quantum dots that emit yellow-green light under the excitation of 365nm ultraviolet light.

Embodiment 3

[0026] Disperse 100mg of polyethyleneimine in 40ml of ethanol, stir well, transfer the solution to a reaction kettle, raise the temperature to 180°C for 20h, and cool to room temperature. The product is separated and purified by column chromatography to obtain nitrogenized carbon quantum dots that emit yellow-green light under the excitation of 365nm ultraviolet light.

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Abstract

The invention discloses a method for preparing carbon quantum dots by virtue of polyethyleneimine decomposition, belonging to the technical field of preparation of nanometer materials. The method comprises the steps of dispersing polyethyleneimine as a raw material into an ethanol solvent, adequately stirring, carrying out heat treatment at 180-200 DEG C for 20 hours in a reaction kettle, and naturally cooling, so as to obtain decomposed auto-fluorescent polyethyleneimine. The method disclosed by the invention has the advantages that the synthetic process is simple and convenient and high in efficiency; polyethyleneimine simultaneously servers as a carbon source and a nitrogen source, so that obtained carbon quantum dots have high impurity and moderate particle sizes, are monodisperse and water soluble and are expected to be applied to the LED membrane materials, fluorescent marks, DNA carriers and targeted drug delivery particles.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a method for preparing carbon quantum dots based on polyethyleneimine decomposition. This method can prepare autofluorescent nitrided carbon quantum dots through simple operations, and thus is expected to be widely used in optoelectronic materials, bioimaging, targeted drug loading and other fields. Background technique [0002] Polyethyleneimine is a water-soluble high molecular polymer, which is a colorless or light yellow viscous liquid, soluble in water and ethanol, with high adhesion and high adsorption, as a widely used non-viral carrier, It has attracted the attention of scholars in the past ten years. Because of its unique "proton sponge effect", polyethyleneimine is often compounded with organic fluorescent dyes or quantum dots, as a traceable drug carrier, which is used in the field of biomedicine. However, the compounding with organic fluorescent dye...

Claims

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Application Information

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IPC IPC(8): C09K11/65
Inventor 王晓敏王菡
Owner TAIYUAN UNIV OF TECH
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