Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

PH-sensitive dual-emission carbon quantum dot and organic composite film thereof, and preparation methods and applications thereof

A technology of carbon quantum dots and composite thin films, which is applied in the field of nanomaterials, can solve problems such as not being easy to capture with the naked eye, limiting the application range of carbon quantum dots, and few reports on double-peak emission carbon quantum dots, etc., to achieve reduced production costs and simple operation Effect

Inactive Publication Date: 2019-05-21
NORTHEAST FORESTRY UNIVERSITY
View PDF9 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carbon quantum dot fluorescent probes still face some challenges
At present, carbon quantum dot fluorescent probes are mostly used to detect metal ions or small organic molecules, and there are few reports on their application in the field of pH sensing, which greatly limits their application in the field of analysis and detection.
[0003] Although great progress has been made in the preparation of carbon quantum dots, most of the synthesized carbon quantum dots have single-peak emission, and the method of preparing double-peak emission carbon quantum dots is rarely reported.
In addition, the pH environment has a great influence on the fluorescence emission of carbon quantum dots. The investigation of the pH sensitivity of carbon quantum dots is conducive to exploring its fluorescence mechanism and developing its new applications. Dual emission carbon quantum dots have a wider range of applications in the field of pH sensors. The reason for the application prospect is that by comparing the intensity ratios of different emission peaks in the double emission peaks of carbon quantum dots in different pH environments, the change of fluorescence color can be directly observed, while the carbon quantum dots with single peak emission only change Fluorescence intensity, the change is not easy to catch with the naked eye
For example, Chinese patent CN108195816A discloses a method for rapidly synthesizing carbon dots to detect solution pH by using phloroglucinol as a carbon source microwave. The carbon quantum dots synthesized by this method only have a single fluorescence emission peak at 465nm, which limits the scope of application

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
  • PH-sensitive dual-emission carbon quantum dot and organic composite film thereof, and preparation methods and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The invention provides a kind of preparation method with pH sensitive double-emission carbon quantum dots, comprising the following steps:

[0025] Mixing small organic molecules, an organic nitrogen source and a reaction solvent to obtain a reaction mixture;

[0026] The reaction mixture was subjected to a solvothermal reaction to obtain a crude product;

[0027] The crude product is sequentially filtered, rotary evaporated, dissolved in water and dialyzed to obtain dual-emission carbon quantum dots with pH sensitivity under the excitation of ultraviolet light.

[0028] The invention mixes small organic molecules, organic nitrogen source and reaction solvent to obtain reaction mixture. In the present invention, the ratio of the small organic molecule, the organic nitrogen source and the reaction solvent is preferably 0.05-5g:0.05-5g:5-35mL, more preferably 0.1-2g:0.2-2g:10-25mL, most preferably Preferably it is 0.5:0.5g:10mL.

[0029] In the present invention, the s...

Embodiment 1

[0050] Weigh 0.5 g of anhydrous citric acid and 0.5 g of phenylenediamine, add 10 mL of acetone, and ultrasonically mix for 10 min. The obtained reaction mixture was added to a 30mL polytetrafluoroethylene autoclave, and the reactor was solvent-heated at 160°C for 6h in a homogeneous reactor, and the temperature was raised from room temperature to 160°C at a heating rate of 5°C / min. After the reaction was completed, the reaction kettle was naturally cooled to room temperature, and the crude product was filtered through a filter membrane with a pore size of 0.22 μm, dried by rotary evaporation at 60°C, and then dissolved in water, and dialyzed with a dialysis membrane with a molecular weight cut-off of 500Da for 24 hours to obtain carbon quantum point. After mixing 1mL of 5mg / mL carbon quantum dot aqueous solution with 3mL of 5% polyvinyl alcohol, the carbon quantum dot organic composite film was synthesized at 60°C.

[0051] The carbon quantum dots prepared in this embodiment...

Embodiment 2

[0054] Weigh 0.1g of anhydrous glucosamine and 0.2g of polyethyleneimine, add 10mL of ethanol, and ultrasonically mix for 10min. The obtained reaction mixture was added into a 30mL polytetrafluoroethylene autoclave, and the autoclave was subjected to solvent heat treatment at 210°C for 2 hours in a homogeneous reactor, and the temperature was raised from room temperature to 210°C at a heating rate of 5°C / min. After the reaction was completed, the reaction kettle was naturally cooled to room temperature, and the crude product was filtered through a filter membrane with a pore size of 0.22 μm, dried by rotary evaporation at 60°C, and then dissolved in water, and dialyzed with a dialysis membrane with a molecular weight cut-off of 500Da for 24 hours to obtain carbon quantum point.

[0055] After testing, the carbon quantum dots emit blue fluorescence under ultraviolet light and have low cytotoxicity to Hepg2 cells. They have been successfully used in Hepg2 cell imaging and emit g...

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

PropertyMeasurementUnit
Apertureaaaaaaaaaa
Mwcoaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of a pH-sensitive dual-emission carbon quantum dot, and belongs to the technical field of nanomaterials. The pH-sensitive dual-emission carbon quantum dot is prepared from a common organic micro-molecule by using a solvothermal reaction through changing a traditional production process, and has emission peaks at 445 nm and 555 nm respectively, the fluorescence intensity and the fluorescence peak position change with the pH environment, and when the pH value increases, the emission peak at 555 nm weakens, the emission peak at 445 nm strengthens, the fluorescence becomes blue from blue green, and the pH-sensitive dual-emission carbon quantum dot is easily applied to the fields of pH sensors and cell fluorescence imaging, and an organic composite film produced after compounding the pH-sensitive dual-emission carbon quantum dot with an organic polymeric matrix can be applied to fluorescence sensing of acidic and alkaline solvents or gases I orderto carry out food detection.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a pH-sensitive double-emission carbon quantum dot and an organic composite film, a preparation method and an application thereof. Background technique [0002] Carbon quantum dots are a new type of carbon nanomaterials with a diameter of less than 10nm, quasi-spherical shape, and monodisperse. Due to their excellent water solubility, chemical inertness, low toxicity, easy functionalization and photobleaching resistance, carbon quantum dots have gradually become a A new star in the family of carbon nanomaterials. In recent years, thanks to the fluorescence quenching and recovery characteristics of carbon quantum dots, they have shown good application effects in the field of analysis and detection. However, carbon quantum dot fluorescent probes still face some challenges. At present, carbon quantum dot fluorescent probes are mostly used to detect metal ions or s...

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): C09K11/65C09K11/02G01N21/64B82Y20/00B82Y30/00
Inventor 李伟刘守新刘禹杉马春慧吴雪云罗沙
Owner NORTHEAST FORESTRY UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com