Fluorescence carbon quantum dots, and preparation method and application thereof

A carbon quantum dot and fluorescence technology, applied in the field of luminescent nanomaterials, can solve the problems of high cost, low fluorescence quantum yield, unfavorable continuous and large-scale production of carbon quantum dots, etc., and achieves convenient operation, wide source of raw materials, and quantum yield. high effect

Inactive Publication Date: 2014-09-10
SHANXI UNIV
View PDF2 Cites 58 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
  • Fluorescence carbon quantum dots, and preparation method and application thereof
  • Fluorescence carbon quantum dots, and preparation method and application thereof
  • Fluorescence carbon quantum dots, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] Step 1. Weigh 1 g of chitosan in a microwave resistant container, then add 10 mL of 8% glacial acetic acid and 5 mL of ethylenediamine solution, stir well to obtain a paste-like substance;

[0030] Step 2. Place the microwave resistant container in a microwave oven (700 watts) under high fire for 15 minutes to obtain a black solid;

[0031] Step 3. Take out the microwave resistant container, cool it naturally, add 20mL of secondary water to it, stir to dissolve to obtain a brown solution, filter to remove insolubles to obtain a clear brown solution, and remove impurities by dialysis to obtain a pure aqueous solution of fluorescent carbon quantum dots ;

[0032] Step 4, freeze-drying the fluorescent carbon quantum dot aqueous solution to obtain fluorescent carbon quantum dots, the relative quantum yield (using quinine sulfate as the standard) is 19.5%.

[0033] Characterization and application see Figure 1-10 .

Example Embodiment

[0034] Example 2

[0035] Step 1. Weigh 2g of chitosan in a microwave resistant container, then add 20mL of 4% glacial acetic acid and 10mL of ethylenediamine solution, stir well to obtain a paste-like substance;

[0036] Step 2. Place the microwave-resistant container in a microwave oven (700 watts) under high fire for 17 minutes to obtain a black solid;

[0037] Step 3. Take out the microwave-resistant container, cool it naturally, add 40 mL of secondary water to it, stir to dissolve to obtain a brown solution, filter to remove insolubles to obtain a clear brown solution, and remove impurities by dialysis to obtain a pure aqueous solution of fluorescent carbon quantum dots ;

[0038] Step 4, freeze-drying the above-mentioned fluorescent carbon quantum dot aqueous solution to obtain high fluorescent quantum yield carbon quantum dots, and the relative quantum yield (using quinine sulfate as the standard) is 16.6%.

Example Embodiment

[0039] Example 3

[0040] Step 1. Weigh 1 g of chitosan in a microwave resistant container, then add 8 mL of 8% glacial acetic acid and 7 mL of ethylenediamine solution, stir well to obtain a paste-like substance;

[0041] Step 2: Place the microwave-resistant container in a microwave oven (700 watts) under high fire for 12 minutes to obtain a black solid;

[0042] Step 3. Take out the microwave-resistant container, cool it naturally, add 20 mL of secondary water to it, stir to dissolve to obtain a brown solution, filter to remove insolubles to obtain a clear brown solution, and remove impurities by dialysis to obtain a pure aqueous solution of fluorescent carbon quantum dots ;

[0043] Step 4, freeze-dry the above-mentioned fluorescent carbon quantum dot aqueous solution to obtain carbon quantum dots with high fluorescence quantum yield, and the relative quantum yield (using quinine sulfate as the standard) is 17.1%.

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 discloses high-quantum-yield fluorescence carbon quantum dots and a preparation method thereof. The method comprises the following steps: by using chitosan as a carbon source, adding glacial acetic acid and ethylenediamine, and sufficiently stirring to obtain a paste; reacting in a microwave oven to finally obtain a black solid; taking out, naturally cooling, adding a certain amount of secondary water, dissolving by stirring to obtain a brown solution, removing the insoluble substance to obtain a brown solution, dialyzing to remove impurities to obtain a fluorescence carbon quantum dot water solution, and carrying out freeze-drying to obtain the fluorescence carbon quantum dots. The method has the advantages of simple technique, wide raw material sources, low price, low requirements for preparation conditions and higher quantum yield of the obtained carbon quantum dots. The obtained fluorescence carbon quantum dots can be used for detecting Fe<3+> in a water body, and can also be used in living cell fluorescence imaging.

Description

technical field [0001] The invention relates to a luminescent nanometer material, in particular to a carbon quantum dot, in particular to a fluorescent carbon quantum dot with high quantum yield and its preparation method and application. Background technique [0002] Carbon quantum dots (carbon dots, C-Dots) are a carbon-based quantum dot discovered for the first time by Scrivens et al. A new type of 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 a luminous range. Incomparable advantages such as adjustable, large two-photon absorption cross-section, high fluorescence quantum efficiency, good photostability, no light flicker, easy functionalization, low price, easy large-scale synthesis, and basically no damage to cells, especially in label...

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): C09K11/65G01N21/64
Inventor 弓晓娟路雯靖武鑫董川双少敏
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