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High-fluorescence zinc ion doped carbon quantum dot with citric acid chelated zinc as precursor and preparation method of high-fluorescence zinc ion doped carbon quantum dot

A technology of carbon quantum dots and zinc ions, which is applied in the field of high-fluorescence zinc ion-doped carbon quantum dots and their preparation, can solve the problems of complicated preparation process, insignificant fluorescence enhancement, low yield and fluorescence intensity, etc. The process is simple, the application prospect is good, and the fluorescence intensity is enhanced.

Inactive Publication Date: 2018-09-28
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: traditional carbon quantum dots have the disadvantages of low yield and fluorescence intensity, and the carbon quantum dots doped by the two-step method have problems such as cumbersome preparation process and inconspicuous fluorescence enhancement. The present invention provides solutions to the above The problem is a highly fluorescent zinc ion-doped carbon quantum dot and its preparation method using citric acid chelated zinc as a precursor. The synthesized carbon quantum dot has the advantages of simple preparation process, mild synthesis conditions, low cost, high product purity, Excellent luminescence and stability

Method used

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  • High-fluorescence zinc ion doped carbon quantum dot with citric acid chelated zinc as precursor and preparation method of high-fluorescence zinc ion doped carbon quantum dot
  • High-fluorescence zinc ion doped carbon quantum dot with citric acid chelated zinc as precursor and preparation method of high-fluorescence zinc ion doped carbon quantum dot
  • High-fluorescence zinc ion doped carbon quantum dot with citric acid chelated zinc as precursor and preparation method of high-fluorescence zinc ion doped carbon quantum dot

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Experimental program
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Effect test

Embodiment 1

[0029] Step 1, preparation of citric acid solution: Weigh 2.1g of citric acid solid particles and place them in a beaker, add 30ml of deionized water, stir to dissolve at room temperature, and obtain the required citric acid solution;

[0030] Step 2, preparation of zinc nitrate solution: Weigh 0.2475g (9%) of zinc nitrate solid particles into a beaker, add 1ml of deionized water, stir to dissolve at room temperature, and obtain the required zinc nitrate solution;

[0031] Step 3, the preparation of the citric acid chelated zinc precursor: mix the citric acid solution and the zinc nitrate solution, react at room temperature for 5 minutes, and obtain the citric acid chelated zinc precursor solution;

[0032] Step 4, preparation of zinc ion-doped carbon quantum dots: transfer the synthesized citric acid chelated zinc precursor into a reaction kettle for 4 hours of hydrothermal reaction at 200°C, and cool to room temperature to obtain an orange transparent liquid;

[0033] Step 5...

Embodiment 2

[0036]Step 1, preparation of citric acid solution: Weigh 2.1 g of solid particles and place them in a beaker, add 30 ml of deionized water, stir to dissolve at room temperature, and obtain the required citric acid solution;

[0037] Step 2, preparation of zinc nitrate solution: Weigh 0.0275g (1%) zinc nitrate solid particles and place them in a beaker, add 5ml of deionized water, stir to dissolve at room temperature, and obtain the required zinc nitrate solution;

[0038] Step 3, preparation of the citric acid chelated zinc precursor: mix the citric acid solution and the zinc nitrate solution, and react at room temperature for 10 minutes to obtain the citric acid chelated zinc precursor solution;

[0039] Step 4, preparation of zinc ion-doped carbon quantum dots: transfer the synthesized citric acid chelated zinc precursor into a reaction kettle for 4 hours of hydrothermal reaction at 200°C, and cool to room temperature to obtain an orange transparent liquid;

[0040] Step 5, ...

Embodiment 3

[0042] Step 1, preparation of citric acid solution: Weigh 2.1 g of citric acid solid particles and place them in a beaker, add 50 ml of deionized water, stir to dissolve them at room temperature, and obtain the required citric acid solution;

[0043] Step 2, preparation of zinc nitrate solution: Weigh 0.595g (20%) of zinc nitrate solid particles and place them in a beaker, add 10ml of deionized water, stir to dissolve at room temperature, and obtain the required zinc nitrate solution;

[0044] Step 3, the preparation of the citric acid chelated zinc precursor: mix the citric acid solution and the zinc nitrate solution, react at room temperature for 5 minutes, and obtain the citric acid chelated zinc precursor solution;

[0045] Step 4, preparation of zinc ion-doped carbon quantum dots: transfer the synthesized citric acid chelated zinc precursor into a reaction kettle for 15 hours of hydrothermal reaction at 150°C, and cool to room temperature to obtain an orange transparent li...

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Abstract

The invention provides a high-fluorescence zinc ion doped carbon quantum dot with citric acid chelated zinc as a precursor and a preparation method of the high-fluorescence zinc ion doped carbon quantum dot. The preparation method comprises the following steps: (1) preparing a citric acid solution; (2) preparing a zinc salt solution; (3) preparing a citric acid chelated zinc precursor; (4) preparing a zinc ion doped carbon quantum dot through hydrothermal treatment; (5) purifying the zinc ion doped carbon quantum dot. According to the zinc ion doped carbon quantum dot, the fluorescence intensity of the zinc ion doped carbon quantum dot is changed along with concentration change of zinc ions, and compared with fluorescence intensity of an undoped carbon quantum dot, the fluorescence intensity of the zinc ion doped carbon quantum dot can be increased by 4-8 times, in addition, an optimal excitation wavelength and an emission wavelength both have red shift. In addition, the zinc ion dopedcarbon quantum dot provided by the invention is prepared by using a one-step hydrothermal method, has the advantages of being simple in preparation process, gentle in synthesis condition, low in cost, non-toxic and the like, and can be applied to fields such as optical devices and biological medicines.

Description

technical field [0001] The invention relates to a carbon quantum dot with high fluorescence performance, in particular to a highly fluorescent zinc ion-doped carbon quantum dot with citric acid chelated zinc as a precursor and a preparation method thereof. Background technique [0002] Carbon quantum dots are a new type of carbon nanomaterial with a size below 10nm. It is an unknown fluorescent carbon nanomaterial first discovered by Xu et al. in 2004. Compared with other carbon nanomaterials, carbon quantum dots have unique luminescent properties and have shown potential application value in the fields of biomedicine, fluorescent sensing, light-emitting diodes, and catalysis. However, the fluorescence quantum yield and fluorescence intensity of the carbon quantum dots prepared at present cannot reach the level of traditional metal quantum dots, so the application in the fields of LED display technology and biomedicine is still immature. Therefore, exploring high quantum yie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 李峻峰何欢肖逸菲李平包珊珊刘磊张佩聪赖雪飞
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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