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Europium ion-doped carbon quantum dot and preparation method thereof

A technology of carbon quantum dots and europium ions, which is applied in the field of europium ion-doped carbon quantum dots and its preparation, can solve the problems of singleness of light emission, achieve high purity of synthetic products, mild synthesis conditions, and overcome the singleness of light emission

Inactive Publication Date: 2018-06-19
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: traditional carbon quantum dots have the deficiency of luminous unity. The present invention provides a kind of europium ion-doped carbon quantum dot and its preparation method which solves the above problems. Good stability and stability, adjustable color of carbon quantum dots, simple preparation process, mild synthesis conditions, low cost and other advantages

Method used

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  • Europium ion-doped carbon quantum dot and preparation method thereof
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  • Europium ion-doped carbon quantum dot and preparation method thereof

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Embodiment 1

[0028] Step 1, preparation of citric acid solution: Weigh 2.1 g of citric acid solid particles and place them in a beaker, add 40 ml of deionized water, stir to dissolve at room temperature, and obtain the required citric acid solution;

[0029] Step 2, preparation of europium nitrate solution: Weigh 0.0352g (2%) rare earth europium oxide, drop into concentrated nitric acid, and wait for the rare earth oxide to react completely to obtain the required europium nitrate solution;

[0030] Step 3, preparation of europium ion-doped citric acid carbon quantum dots: mix citric acid solution and europium nitrate solution, react at room temperature for 10 minutes, then transfer to a reaction kettle for 3 hours of hydrothermal reaction at 200°C, The obtained light yellow transparent liquid is europium ion-doped citrate carbon quantum dots. Its transmission electron microscope (TEM) images are as follows: figure 1 As shown, the fluorescence excitation spectrum is shown as figure 2 As ...

Embodiment 2

[0032] Step 1, preparation of citric acid solution: Weigh 2.1 g of citric acid solid particles and place them in a beaker, add 40 ml of deionized water, stir to dissolve at room temperature, and obtain the required citric acid solution;

[0033] Step 2, preparation of europium nitrate solution: Weigh 0.0088g (0.5%) rare earth europium oxide, drop into concentrated nitric acid, and wait for the complete reaction of europium oxide to obtain the required europium nitrate solution;

[0034] Step 3, preparation of europium ion-doped citric acid carbon quantum dots: mix citric acid solution and europium nitrate solution, react at room temperature for 10 minutes, then transfer to a reaction kettle for 6 hours of hydrothermal reaction at 150°C, The obtained light yellow transparent liquid is europium ion-doped citrate carbon quantum dots.

Embodiment 3

[0036] Step 1, preparation of citric acid solution: Weigh 2.1 g of citric acid solid particles and place them in a beaker, add 40 ml of deionized water, stir to dissolve at room temperature, and obtain the required citric acid solution;

[0037] Step 2, preparation of europium nitrate solution: Weigh 0.086g (5%) rare earth europium oxide, drop into concentrated nitric acid, and wait for the complete reaction of europium oxide to obtain the required europium nitrate solution;

[0038] Step 3, preparation of europium ion-doped citric acid carbon quantum dots: mix citric acid solution and europium nitrate solution, react at room temperature for 10 minutes, then transfer to a reaction kettle for 2 hours of hydrothermal reaction at 240°C, The obtained light yellow transparent liquid is europium ion-doped citrate carbon quantum dots.

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Abstract

The invention discloses a europium ion-doped carbon quantum dot and a preparation method thereof. The carbon quantum dot uses citric acid as a precursor carbon source, has a europium ion doping concentration of 0.5-5%, is in a shape of sphere and has a diameter of 1-10 nm; and the preparation method comprises the following steps: weighing and placing citric acid in a beaker, adding water, stirringand dissolving to obtain a citric acid solution; weighing rare earth europium oxide, dripping concentrated nitric acid, and reacting the rare earth oxide completely to obtain a rare earth nitrate solution; mixing the nitric acid solution with the rare earth europium nitrate solution, stirring and then performing hydrothermal reaction at 100-240 DEG C for 2-15 h to obtain yellow transparent liquidwhich is a europium ion-doped citric acid carbon quantum dot. The europium ion-doped carbon quantum dot has the advantages of high purity of a synthesized product, excellent luminescence and stability of the product, and adjustable color of the carbon quantum dot, overcomes luminescence singleness of traditional carbon quantum dots, enables luminescence to move to a red light region, and has goodapplication prospect in fields of optical devices, biomedicines and the like.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a europium ion-doped carbon quantum dot and a preparation method thereof. Background technique [0002] As a new type of carbon nanomaterial newly developed in recent years, carbon quantum dots (CDs) not only have the unique properties of carbon skeleton, but also have superior characteristics than traditional quantum dots. In addition to the fluorescent properties similar to traditional metal quantum dots, it also has small molecular weight and particle size, high fluorescence stability, no light flicker, wide and continuous excitation spectrum, tunable emission wavelength, good biocompatibility, low toxicity, etc. advantage. In addition, due to the quantum confinement effect and boundary effect of carbon quantum dots, it also exhibits many special properties, and is considered to be an ideal material to replace traditional quantum dots for screen display, biomarker and f...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/7728
Inventor 李峻峰何欢李平肖逸菲包珊珊刘磊张佩聪赖雪飞
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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