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

A technology of carbon quantum dots and fluorescence quantum yield, applied in the direction of fluorescence/phosphorescence, chemical instruments and methods, luminescent materials, etc., can solve the problems of high cost, low fluorescence quantum yield, unfavorable continuous and large-scale production of carbon quantum dots, etc. , to achieve the effect of convenient operation, high fluorescence quantum yield and simple operation

Inactive Publication Date: 2015-02-18
SHANXI UNIV
View PDF4 Cites 31 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The top-down synthesis method, that is, the physical method of exfoliating carbon nanoparticles from larger carbon structures, and then passivating the polymer surface to make them emit light effectively, mainly includes arc discharge, laser ablation, and electrochemical oxidation. , electron beam radiation, etc., such methods often require strict experimental conditions or special energy sources, the cost is high, and the fluorescence quantum yield of carbon quantum dots is low; the bottom-up synt

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fluorescent carbon quantum dot as well as preparation method and application thereof
  • Fluorescent carbon quantum dot as well as preparation method and application thereof
  • Fluorescent carbon quantum dot as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1, weigh 0.5g of oxalic acid and 0.5g of urea in a microwave-resistant container, then add 10mL of secondary water, stir well, and ultrasonically obtain a clear solution;

[0037] Step 2, the microwave-resistant container is placed in a microwave oven (800 watts) and reacted for 8 minutes under high heat to obtain a light yellow solid;

[0038] Step 3, take out the microwave-resistant container, cool it naturally, add 10mL of secondary water into it, stir and dissolve to obtain a light yellow solution, filter and remove insoluble matter to obtain a clear light yellow solution, remove impurities by dialysis, and obtain pure fluorescent carbon quantum dots aqueous solution;

[0039] In step 4, the fluorescent carbon quantum dot aqueous solution is freeze-dried to obtain the fluorescent carbon quantum dot, and its relative quantum yield (using quinine sulfate as a standard) is 28.7%.

[0040] Characterization and application see Figure 1-13 .

Embodiment 2

[0042] Step 1, weigh 0.5g of oxalic acid and 0.8g of urea in a microwave-resistant container, then add 13mL of secondary water, stir well, and ultrasonically obtain a clear solution;

[0043] Step 2, the microwave-resistant container is placed in a microwave oven (800 watts) and reacted for 10 minutes under high heat to obtain a light yellow solid;

[0044] Step 3, take out the microwave-resistant container, cool naturally, add 14mL of secondary water to it, stir and dissolve to obtain a light yellow solution, filter and remove insoluble matter to obtain a clear light yellow solution, remove impurities by dialysis, and obtain pure fluorescent carbon quantum dots aqueous solution;

[0045] In step 4, the fluorescent carbon quantum dot aqueous solution is freeze-dried to obtain the fluorescent carbon quantum dot, and its relative quantum yield (taking quinine sulfate as a standard) is 25.7%.

Embodiment 3

[0047] Step 1, weigh 0.8g oxalic acid and 0.5g urea in a microwave-resistant container, then add 14mL of secondary water, stir well, and ultrasonically obtain a clear solution;

[0048] Step 2, the microwave-resistant container was placed in a microwave oven (800 watts) and reacted for 11 minutes at high heat to obtain a light yellow solid;

[0049] Step 3, take out the microwave-resistant container, cool it naturally, add 15mL of secondary water into it, stir and dissolve to obtain a light yellow solution, filter and remove insoluble matter to obtain a clear light yellow solution, remove impurities by dialysis, and obtain pure fluorescent carbon quantum dots aqueous solution;

[0050]In step 4, the fluorescent carbon quantum dot aqueous solution is freeze-dried to obtain the fluorescent carbon quantum dot, and its relative quantum yield (using quinine sulfate as a standard) is 22.1%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a fluorescent carbon quantum dot which is high in fluorescent quantum yield and a preparation method of the fluorescent carbon quantum dot. The preparation method of the fluorescent carbon quantum dot comprises the following steps: by taking oxalic acid as a carbon source and urea as a nitrogen source, adding secondary water to perform ultrasonic treatment to obtain a clear solution; putting the clear solution in a microwave oven to react to finally obtain light yellow solids; taking out the light yellow solids to be naturally cooled, then, adding a certain amount of secondary water, and stirring and dissolving to obtain a light yellow solution, removing insoluble substances to obtain a clear light yellow solution, dialyzing to remove impurities to obtain a carbon quantum dot solution, and freezing and drying to obtain a carbon quantum dot. The preparation method disclosed by the invention is simple in process, wide in raw material source, low in price, low in requirements of preparation conditions, and relatively high in quantum yield of the obtained quantum dot. The carbon quantum dot obtained by the preparation method disclosed by the invention can be used for detecting Fe<3+> and Ag<+> in water, can be applied to living cell fluorescence imaging and also can be used as a false proof mark.

Description

technical field [0001] The invention relates to a luminescent nanometer material, in particular to a carbon quantum dot, in particular to a carbon quantum dot with a high fluorescence quantum yield and a preparation method and application thereof. Background technique [0002] Carbon quantum dots (carbon dots, C-dots) are a carbon-based material first discovered by Scrivens et al. It is a new nanomaterial with a skeleton structure. Compared with traditional semiconductor quantum dots and organic dyes, carbon quantum dots, as a new type of luminescent material, not only maintain the advantages of carbon materials such as low toxicity and good biocompatibility, but also have the advantages of synthetic Convenience, easy modification, adjustable luminous range, large two-photon absorption cross section, high fluorescence quantum efficiency, good photostability, no light flicker, easy functionalization, low price, easy large-scale synthesis and other incomparable advantages, and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C09K11/65G01N21/64G09F3/00
Inventor 弓晓娟芦冬涛李勇路雯婧双少敏董川
Owner SHANXI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap