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

2 Cites 58 Cited by

AI-Extracted 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...

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

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.

Application Domain

Fluorescence/phosphorescenceLuminescent compositions

Technology Topic

Carbon sourceQuantum yield +15

Image

Examples

Experimental program(6)

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

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

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

Classification and recommendation of technical efficacy words

Wide variety of sources
Easy to operate

Fluorescence carbon quantum dots, and preparation method and application thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

Similar technology patents

Method and system for managing caller in household network, household gateway

Method for operating user interface and mobile terminal

Composite material of poly lactic acid / natural faric, and production method

Surgical device for connecting soft tissue

Parking space inquiry booking system and inquiry booking method thereof

Classification and recommendation of technical efficacy words

Method for preparing cellulose composite aerogel

Nitrogen and phosphorus removal method by using pyrite as biochemical filling

Controlled release fertilizer coated by vegetable oil based polyurethane and preparation method thereof

Graphene electrothermal film

Method for preparing brucite fiber reinforced SiO2 aerogel heat-insulating material

Using various flash memory cells to build USB data flash cards with multiple partitions and autorun function

System and method for information access

Resistive heating device and method for turbinate ablation

Operating mechanism, medical manipulator, and surgical robot system

Module for monitoring vehicle operation through onboard diagnostic port