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Metal doped carbon points with high fluorescence quantum yield and preparation method and application thereof

A technology of metal doping and carbon dots, applied in the field of nanomaterials, can solve the problems of low fluorescence quantum yield, etc., and achieve the effects of high fluorescence quantum yield, less raw material consumption, and less by-products and intermediate products.

Active Publication Date: 2015-12-09
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although carbon dots doped with sulfur and nitrogen single-atom elements or diatomic dots have higher luminous intensity, however, their fluorescence quantum yield is still at a low level, and they are also used in biological detection and sewage treatment. There are big limitations

Method used

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  • Metal doped carbon points with high fluorescence quantum yield and preparation method and application thereof
  • Metal doped carbon points with high fluorescence quantum yield and preparation method and application thereof
  • Metal doped carbon points with high fluorescence quantum yield and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0057] (a) Take 0.735g of sodium citrate and 0.0617g of cuprous chloride, dissolve in 25mL of deionized water and stir for 5min to obtain a precursor solution;

[0058] (b) Place the obtained precursor solution in a 50ml polytetrafluoroethylene-lined stainless steel autoclave, seal it and react at a temperature of 200°C for 6h, and cool it naturally to room temperature to obtain a suspension;

[0059] (c) Filter the suspension with a cylindrical membrane separation filter with a molecular weight cut-off of 3 kDa, collect the filtrate, and dry to obtain copper-doped carbon dots with a high fluorescence yield.

[0060] see figure 1 , which is the transmission electron microscope image of the copper-doped fluorescent carbon dots prepared in this example, from figure 1 The carbon dots were tested to be uniform circular particles with a size between 2.5nm and 5nm and an average particle diameter of 3.76nm.

[0061] see figure 2 , it is the copper-doped fluorescent carbon dot pr...

Embodiment 2

[0064] (a) Take 0.735g of sodium citrate and 0.0617g of cuprous chloride, dissolve in 25mL of deionized water and stir for 5min to obtain a precursor solution;

[0065] (b) Place the obtained precursor solution in a 50mL polytetrafluoroethylene-lined stainless steel autoclave, seal and react at 200°C for 6h, and cool naturally to room temperature to obtain a suspension;

[0066] (c) Filtrating the suspension with a cylindrical membrane separation filter with a molecular weight cut-off of 3 kDa, collecting the filtrate, and drying to obtain copper-doped carbon dots with a high fluorescence yield. The carbon dots obtained in this example have a luminous intensity of 350,000 under the irradiation of 340nm light.

Embodiment 3

[0068] (a) Take 0.735g of sodium citrate and 0.0617g of cuprous chloride, dissolve in 25mL of deionized water and stir for 5min to obtain a precursor solution;

[0069] (b) Place the obtained precursor solution in a 50mL polytetrafluoroethylene-lined stainless steel autoclave, react for 6h under sealed conditions at 180°C, and cool naturally to room temperature to obtain a suspension;

[0070] (c) Filtrating the suspension with a cylindrical membrane separation filter with a molecular weight cut-off of 5 kDa, collecting the filtrate, and drying to obtain a copper-doped carbon dot with a high fluorescence yield. The carbon dots obtained in this example had a luminous intensity of 140,000 under the irradiation of 450nm light.

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Abstract

The present invention provides metal doped carbon points with high fluorescence quantum yield and a preparation method and application thereof. The pure metal-doped carbon points are primarily synthesized by hydrothermal synthesis method, and the pure metal-doped carbon points have high fluorescence quantum yield. The pure metal-doped carbon points can be prepared only by one-step reaction, the cost is low, reaction speed is quick, byproducts and intermediate products are fewer; at the same time the pure metal-doped carbon points have the characteristics of high fluorescence quantum yield, are expected to be used in human blood trace Fe<3+> detection, and have broad application prospects in biological detection and sewage treatment.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a metal-doped carbon dot and its preparation method and application, in particular to a copper-doped carbon dot with high fluorescence quantum yield and its preparation method and application. Background technique [0002] Carbon has a variety of electronic orbital characteristics (sp, sp 2 , sp 3 ), so many substances with peculiar structures and properties can be formed, such as carbon nanotubes, fullerenes, nanodiamonds, graphene and graphene oxide, etc. Carbon dots were first reported by Xu et al. in 2004. They discovered carbon nanoparticles with fluorescent properties when using gel electrophoresis to separate single-walled carbon nanotubes from carbon ash generated by arc discharge, opening up a new era of new fluorescent sensitive materials. (see X.D.Xu, R.Ray, Y.L.Gu, et al. Electrophoretic Analysis and Purification of Fluorescent Single-walledcarbon Nanotube Fragments [J]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y30/00B82Y20/00G01N21/64
Inventor 徐泉周红军魏建斐刘瑶王静林苏日古
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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