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One-step preparation method of multicolor fluorescent functionalized graphene quantum dots

A technology of quantum dots and graphene sheets, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of cumbersome preparation process, single fluorescence emission range, low quantum yield, etc., and achieves simple preparation process and wide application range. , easy to operate effect

Active Publication Date: 2014-08-13
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphene quantum dots prepared by existing methods are cumbersome in preparation process, low in quantum yield and single in fluorescence emission range

Method used

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  • One-step preparation method of multicolor fluorescent functionalized graphene quantum dots
  • One-step preparation method of multicolor fluorescent functionalized graphene quantum dots
  • One-step preparation method of multicolor fluorescent functionalized graphene quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Disperse 50mg of graphene oxide in 40ml of ethanol, add 0.2±0.01g (0.19g, 0.20g, 0.21g) of PEI reagent, adjust the pH to 12 with concentrated ammonia water, transfer the mixture to the reaction kettle, The temperature was raised to 200° C. for 20 h, cooled to room temperature, and the product was separated by filtration to obtain a supernatant which was an ethanol solution of functionalized graphene quantum dots. The graphene oxide sheets before the reaction and the XRD pattern and Fourier transform infrared spectrum of the reduced graphene oxide after the reaction are as follows: figure 1 and figure 2 . The prepared functionalized graphene quantum dot ethanol solution showed strong blue-green fluorescence under ultraviolet light, and the photoluminescence spectra at different excitation wavelengths were as follows: image 3 shown. Its maximum excitation wavelength is 380nm, and the maximum fluorescence emission wavelength at this time is 465nm.

[0036] Using colu...

Embodiment 2

[0042] Disperse 20mg of graphene oxide in 40ml of ethanol, add 0.2±0.01g (0.19g, 0.20g, 0.21g) of PEI reagent, adjust the pH to 12 with concentrated ammonia water, transfer the mixture to the reaction kettle, The temperature was raised to 200°C for 24 hours, cooled to room temperature, and the product was separated by filtration to obtain a supernatant, which was an ethanol solution of functionalized graphene quantum dots, which showed strong blue fluorescence under ultraviolet light. The maximum excitation wavelength is 365nm, and the maximum fluorescence emission wavelength is 445nm. Figure 6 shown.

Embodiment 3

[0044]Disperse 400mg of graphene oxide in 40ml of ethanol, add 0.2±0.01g (0.19g, 0.20g, 0.21g) of PEI reagent, adjust the pH to 12 with concentrated ammonia water, transfer the mixture to the reaction kettle, The temperature was raised to 200°C for 20 hours, cooled to room temperature, and the product was separated by filtration to obtain a supernatant, which was an ethanol solution of functionalized graphene quantum dots, which showed strong blue fluorescence under ultraviolet light. The maximum excitation wavelength was tested to be 380nm, and the maximum fluorescence emission wavelength at this time was 456nm, such as Figure 7 shown.

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Abstract

The invention discloses a one-step preparation method of multicolor fluorescent functionalized graphene quantum dots, belonging to the technical field of nanomaterial preparation. The one-step preparation method comprises the following steps of with graphene oxide sheets as raw materials, dispersing the graphene oxide sheets into different solvents such as ethanol and the like; adding polyethyleneimine, and regulating the pH value to 12 by using ammonia water; after sufficiently stirring, carrying out heat treatment in a reaction kettle at the temperature of 100-200 DEG C for 1-24h; naturally cooling, and collecting filtrate after filtering; after drying, purifying through column chromatography and carrying out size separation to obtain functionalized graphene quantum dots with different fluorescence colors. The method provided by the invention is simple and convenient in synthesis process and high in efficiency; the obtained fluorescent functionalized graphene quantum dots are high in purity, moderate in monodispersity and particle size, water-soluble, strong in fluorescence property (the quantum yield is up to 18.1%) and expected to be applied to LED (Light Emitting Diode) membrane materials, fluorescence labeling, DNA (Deoxyribonucleic Acid) carriers, targeted drug carrying particles and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a one-step preparation method of multicolor fluorescent functionalized graphene quantum dots. This method can prepare multicolor fluorescent functionalized graphene quantum dots through simple operations, and has a high quantum yield, so it is expected to be widely used in optoelectronic materials, bioimaging, targeted drug loading and other fields. Background technique [0002] Graphene, as a single atomic layer carbon material with honeycomb structure, has attracted extensive attention of scholars in the past decade due to its extraordinary physical and chemical properties. Graphene quantum dots not only have the extraordinary properties of graphene, but also have the unique optical properties of quantum dots. Compared with other semiconductor quantum dots, they have abundant raw materials and low prices, good chemical stability, low cytotoxicity and good biolo...

Claims

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Application Information

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IPC IPC(8): C09K11/65C01B31/04
Inventor 王晓敏王菡郭斌王金平
Owner TAIYUAN UNIV OF TECH
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