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Preparation method of europium-doped carbon quantum dot composite material

A technology of carbon quantum dots and composite materials, applied in the field of preparation of carbon quantum dot composite materials, can solve problems such as few reports, and achieve the effects of small size, high fluorescence stability, and improved fluorescence performance

Active Publication Date: 2015-06-10
临泉县嘉鸿装饰工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the work of combining rare earth elements and carbon quantum dots into composite materials.

Method used

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  • Preparation method of europium-doped carbon quantum dot composite material
  • Preparation method of europium-doped carbon quantum dot composite material
  • Preparation method of europium-doped carbon quantum dot composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation of the carbon quantum dot composite material doped with rare earth europium comprises the following steps:

[0024] (1) Weigh 0.1 g of europium oxide and 2.0 g of citric acid monohydrate into 15 mL of ultrapure water, and stir for 12 h until the solution is transparent and colorless. The mixed solution was added to 150mL of absolute ethanol and allowed to stand for 8h, a large amount of white precipitate was generated. The product was suction-filtered and washed three times with absolute ethanol to obtain a solid product, which was dried at room temperature for 24 h.

[0025] (2) Dissolve the compound obtained in step (1) with 10 mL of ultrapure water, transfer it to a polytetrafluoroethylene reactor, cover and seal it, and put it into a program-controlled box-type electric furnace for heating reaction. The reaction temperature was 180°C, and the reaction was carried out for 4 hours. After cooling to room temperature, take it out, and the obtained ligh...

Embodiment 2

[0028] The preparation process of the carbon quantum dot composite material doped with rare earth europium is the same as that of Example 1, and the amount of europium oxide used is 0.05 g.

[0029] The carbon quantum dot composite material doped with rare earth europium can emit the characteristic fluorescence (478nm) of carbon quantum dots at the excitation wavelength of 396nm, and the characteristic red fluorescence of rare earth europium ( 5 D. 0 → 7 f 1 592nm, 5 D. 0 → 7 f 2 616nm, 5 D. 0 → 7 f 3 695nm). The fluorescence quantum yield of the obtained carbon quantum dot composite material doped with rare earth europium is 4.25%.

Embodiment 3

[0031] The preparation process of the carbon quantum dot composite material doped with rare earth europium is the same as that of the first embodiment, and the amount of europium oxide used is 0.15 g.

[0032] The carbon quantum dot composite material doped with rare earth europium can emit the characteristic fluorescence (478nm) of carbon quantum dots at the excitation wavelength of 396nm, and the characteristic red fluorescence of rare earth europium ( 5 D. 0 → 7 f 1 592nm, 5 D. 0 → 7 f 2 616nm, 5 D. 0 → 7 f 3 695nm). The fluorescence quantum yield of the carbon quantum dot composite material doped with rare earth europium is 6.80%.

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Abstract

The invention relates to a preparation method of a europium-doped carbon quantum dot composite material. The preparation method comprises the following steps: preparing a compound of citric acid and europium, and preparing the europium-doped carbon quantum dot composite material by adopting a hydrothermal method. The preparation method provided by the invention has the following beneficial effects: the method is simple and practical, the europium-doped carbon quantum dot composite material is endowed with the characteristics of high fluorescence stability, small size and good biocompatibility without being subjected to secondary modification, and the europium-doped carbon quantum dot composite material is improved in fluorescence properties significantly and can be excited by near ultraviolet to emit the characteristic red light of europium.

Description

technical field [0001] The invention relates to a preparation method of a carbon quantum dot composite material doped with rare earth europium, and belongs to the technical field of carbon quantum dot preparation. technical background [0002] Carbon quantum dots are a new type of zero-dimensional carbon nanomaterials following fullerenes, carbon nanotubes and graphene. Easy to functionalize, it is defined as an ideal fluorescent labeling and detection material. In addition to the wide application of carbon quantum dots, the research on composite materials based on carbon quantum dots is also a hot topic at present. Composite materials are composed of two or more different materials. Each component material cooperates with each other, not only exerting its own advantages, but also possessing new properties. Therefore, the research based on carbon quantum dot composites is an important topic of functionalization of carbon quantum dots. [0003] At present, the carbon quant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65
Inventor 孔泳欧洁黎珊秦勇陶永新
Owner 临泉县嘉鸿装饰工程有限公司
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