Preparation method of carbon quantum dots with blue-green fluorescence

A technology of blue-green fluorescence and carbon quantum dots, which is applied in the field of preparation of fluorescent nanomaterials, can solve the problems of single fluorescence color and low quantum yield of carbon quantum dots, and achieve high quantum yield, simple and easy method, and excellent reaction conditions mild effect

Active Publication Date: 2015-07-01
NANJING UNIV OF TECH
View PDF3 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But the fluorescent color of carbon quantum dots prepared by most methods is relatively s

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
  • Preparation method of carbon quantum dots with blue-green fluorescence
  • Preparation method of carbon quantum dots with blue-green fluorescence
  • Preparation method of carbon quantum dots with blue-green fluorescence

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example 1

[0033] 1 Preparation of carbon quantum dots

[0034] Take 0.036g Kapton type polyimide (PI), 10g purified water, put it in a 15ml hydrothermal kettle, set the hydrothermal condition to 180°C for 3h. After the reaction, the clear liquid is taken as the obtained carbon quantum dot solution. The main peak is determined by fluorescence spectrometer at 485nm (such as figure 2 Shown), the half-peak width is about 50nm, measured by X-ray diffractometer, its spectrum (such as image 3 (Shown) shows a wide (002) peak at 2θ=25°, which further proves the amorphous structure of the white light carbon quantum dots. By shooting a transmission electron microscope (e.g. figure 1 It can be seen that the white light carbon quantum dots are uniform in size and well dispersed, similar to a spherical shape. According to its size distribution diagram, we get the average diameter of white light carbon quantum dots to be 3.4nm. By shooting a transmission electron microscope (e.g. F...

Example Embodiment

[0037] Example 2

[0038] 1 Preparation of carbon quantum dots

[0039] Take 0.047g Kapton type polyimide (PI), 10g purified water, 0.003g ethylenediamine, 0.03g γ-methacryloxypropyltrimethoxysilane (KH570), put it in a 15ml hydrothermal kettle, set The constant hydrothermal condition is 170℃ for 6h. After the reaction, the solution in the kettle and the centrifuge tube were centrifuged at 12000 rpm for 20 minutes to obtain the supernatant. And use a 30KD ultrafiltration molecular membrane to filter the resulting clear liquid, and collect the filtrate to obtain the carbon dots. The fluorescence emission peak of the prepared carbon dots is at 495nm, the fluorescence lifetime is at 4ns, and the diameter is at 5nm.

[0040] 2 screen printing

[0041] Take 2ml of the carbon quantum dots prepared above, weigh 8g of polyvinylpyrrolidone (K-30), mix the two, and magnetically stir for 2h, let stand for 2h, take 2g of the solution on the screen of the screen printing instrument and place it...

Example Embodiment

[0042] Example 3

[0043] 1 Preparation of carbon quantum dots

[0044] Take 0.029g Kapton type polyimide (PI), 10g purified water, 0.008g ethylenediamine, 0.07g γ-methacryloxypropyltrimethoxysilane (KH570), and place it in a 15ml hydrothermal kettle. Set the hydrothermal conditions to 195°C for 5h. After the reaction, the solution in the kettle and the centrifuge tube were centrifuged at 12000 rpm for 20 minutes to obtain the supernatant. And use a 30KD ultrafiltration molecular membrane to filter the resulting clear liquid, and collect the filtrate to obtain the carbon dots. The fluorescence emission peak of the prepared carbon dots is at 505nm, the fluorescence lifetime is at 5.2ns, and the diameter is at 6.5nm.

[0045] 2 screen printing

[0046] Take 2ml of the carbon quantum dots prepared above, weigh 8g of polyvinylpyrrolidone (K-30), mix the two, and magnetically stir for 2h, let stand for 2h, take 2g of the solution on the screen of the screen printing instrument and place...

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
The average diameteraaaaaaaaaa
Login to view more

Abstract

The invention relates to a preparation method of carbon quantum dots with blue-green fluorescence, which comprises the following specific steps: putting polyimide and water into a hydrothermal kettle, or putting polyimide, water and a passivator into a hydrothermal kettle; then, putting the hydrothermal kettle into a drying oven, and increasing the temperature to carry out a heating reaction; after the reaction is completed, stopping heating, cooling, and taking a solution out the hydrothermal kettle; and centrifugalizing, taking liquid supernatant, dialyzing the liquid supernatant by using a dialysis membrane, thus obtaining a carbon quantum dot aqueous solution. The method disclosed by the invention has the characteristics of mild reaction conditions, simpleness, and easiness for implementation. Prepared carbon quantum dots with blue-green fluorescence can stably emit blue-green fluorescence and the quantum yield is high.

Description

technical field [0001] The invention relates to a method for preparing fluorescent nanometer materials, in particular to a method for preparing carbon quantum dots with blue-green fluorescence. Background technique [0002] Carbon nanomaterials have undergone rapid progress in the past two decades and have become one of the most promising materials that have changed and will continue to change human life. In recent years, the discovery of carbon quantum dots has attracted widespread attention. Carbon quantum dots not only have excellent properties of traditional semiconductor quantum dots, such as size fluorescence response, bleaching resistance and good biocompatibility. At the same time, compared with traditional semiconductor quantum dot materials, carbon quantum dots are not toxic. [0003] Carbon quantum dots not only have excellent performance, but also their raw materials are cheap, and the preparation methods are various and simple. [0004] However, the fluoresce...

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): C01B31/02C09K11/65B82Y30/00
Inventor 陈苏黄立凯
Owner NANJING UNIV OF TECH
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