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Fluorescent carbon quantum dot solution as well as preparation method and application thereof

A technology of carbon quantum dots and fluorescence, which is applied in the field of high fluorescence intensity carbon quantum dot solution and its preparation, fluorescent carbon quantum dot solution and its preparation field, can solve the problems of cumbersome preparation method and high energy consumption, and achieve simple and easy preparation process The effect of high performance, low detection limit, and simple and easy preparation method

Inactive Publication Date: 2019-03-22
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of cumbersome preparation methods and high energy consumption of fluorescent carbon quantum dots in the prior art, the present invention proposes a preparation method and application of a novel fluorescent carbon quantum dot solution with high fluorescence intensity

Method used

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  • Fluorescent carbon quantum dot solution as well as preparation method and application thereof
  • Fluorescent carbon quantum dot solution as well as preparation method and application thereof
  • Fluorescent carbon quantum dot solution as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0055] Weigh 0.2g of citric acid, weigh 1g of urea, and mix them into a solid mixture; place the solid mixture in a microwave oven after grinding it in a mortar for 10 minutes, pyrolyze it for 2 minutes at a power of 700W, and cool naturally to At room temperature, a solid is obtained; add 50mL of water to dissolve, and after centrifugation (10000 rpm, 5 minutes), filtration (0.22μm filter membrane), dialysis (molecular weight cut-off 1000Da, 24 hours), and freeze-drying, fluorescent carbon quantum dots are obtained Solid: Weigh 0.001g fluorescent carbon quantum dot solid, dissolve in 100mL water to obtain fluorescent carbon quantum dot solution. This fluorescent carbon quantum dot solution shows bright blue-green color under ultraviolet light, and its three-dimensional fluorescence spectrum is as follows: figure 1 As shown, when the excitation range is 250-530 nm, the emission range is 350-650 nm. TEM characterization of carbon quantum dots, such as figure 2 As shown, unde...

Embodiment 2

[0057] Weigh 10 g of citric acid, weigh 1 g of urea, and mix them into a solid mixture; grind the solid mixture in a mortar for 10 minutes, place it in a microwave oven, and pyrolyze it for 15 minutes at a power of 700W, and cool it naturally to room temperature , to obtain a solid; add 50mL of water to dissolve, and after centrifugation (10000 rpm, 5 minutes), filtration (0.22 μm filter membrane), dialysis (molecular weight cut-off 1000Da, 24 hours), freeze-drying, obtain a fluorescent carbon quantum dot solid ; Weigh 0.1g fluorescent carbon quantum dot solid, dissolve in 100mL water to obtain fluorescent carbon quantum dot solution. This fluorescent carbon quantum dot solution shows bright blue-green color under ultraviolet light, and its three-dimensional fluorescence spectrum is as follows: image 3 As shown, when the excitation range is 250-530 nm, the emission range is 350-650 nm.

Embodiment 3

[0059] Take by weighing the maleic anhydride of quality 5g, take by weighing the urea of ​​1g, be mixed into solid mixture; Said solid mixture is placed in microwave oven after being ground in mortar for 10 minutes, pyrolyzes 8 minutes under 700W power, naturally cools to At room temperature, a solid is obtained; add 50mL of water to dissolve, and after centrifugation (10000 rpm, 5 minutes), filtration (0.22μm filter membrane), dialysis (molecular weight cut-off 1000Da, 24 hours), and freeze-drying, fluorescent carbon quantum dots are obtained Solid: Weigh 0.01g fluorescent carbon quantum dot solid, dissolve in 100mL water to obtain fluorescent carbon quantum dot solution. This fluorescent carbon quantum dot solution shows bright blue-green color under ultraviolet light, and its three-dimensional fluorescence spectrum is as follows: Figure 4 As shown, when the excitation range is 250-530 nm, the emission range is 350-650 nm.

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Abstract

The invention belongs to the technical field of nano-materials and relates to a fluorescent carbon quantum dot solution as well as a preparation method and application thereof. The carbon quantum dotsolution is obtained by mixing a solid-state carbon source and a solid-state nitrogen source and then carrying out pyrolysis reaction and simple subsequent treatment. The size of a fluorescent carbonquantum dot is 1 to 20 nm; the excitation range of the fluorescent carbon quantum dot solution is 250 to 530 nm and an emission range is 350 to 650 nm; raw materials of the fluorescent carbon quantumdot solution and objects used in a technology are low in price and abundant in resources; the preparation method is simple, and the fluorescent carbon quantum dot solution has a low environment pollution degree and can be applied to detection of heavy metal ions.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and relates to a fluorescent carbon quantum dot solution and its preparation method and application, and furthermore, relates to a carbon quantum dot solution with high fluorescence intensity and its preparation method and application. Background technique [0002] Since Xu et al. (Xu, Xiaoyou, et al. "Electrophoretic Analysis and Purification of Fluorescent Single-Walled Carbon Nanotube Fragments." Journal of the American Chemical Society 2004,126(40),12736-12737.) reported fluorescent carbon for the first time in 2004. After the discovery of quantum dots, the majority of scientific researchers have carried out extensive research on fluorescent carbon quantum dots. Generally speaking, the diameter of fluorescent carbon quantum dots is within 20nm, which has excellent optical properties, good biocompatibility, low cytotoxicity, and its preparation method is simple and easy, and the cost of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65G01N21/64B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65G01N21/643G01N2021/6432
Inventor 黄元仿曹梦李勇李树志郭孝理张红艳沈重阳
Owner CHINA AGRI UNIV
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