Fluorescent carbon quantum dot/mesoporous alumina composite luminescent material, and preparation method and application thereof to oxygen sensing aspect

A technology of mesoporous alumina and carbon quantum dots, which can be used in luminescent materials, fluorescence/phosphorescence, alumina/aluminum hydroxide, etc. High, luminous stability effect

Active Publication Date: 2017-06-20
SOUTH CHINA AGRI UNIV
View PDF2 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few literatures reporting solid-state luminescence of fluorescent car

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/mesoporous alumina composite luminescent material, and preparation method and application thereof to oxygen sensing aspect
  • Fluorescent carbon quantum dot/mesoporous alumina composite luminescent material, and preparation method and application thereof to oxygen sensing aspect
  • Fluorescent carbon quantum dot/mesoporous alumina composite luminescent material, and preparation method and application thereof to oxygen sensing aspect

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0048] Example 1: Preparation of fluorescent carbon quantum dot / mesoporous alumina composite luminescent material.

[0049] (1) Preparation of matrix material mesoporous alumina: 1.0g P123 as a template, then add 0.3g anhydrous citric acid, 15mL anhydrous ethanol as a solvent, stir to obtain a transparent solution, hydrochloric acid and glacial acetic acid to adjust the PH value of 2~ 3. Add 10 mmol aluminum isopropoxide as the aluminum source, stir well at room temperature for 10 hours to obtain a white milky state, transfer to 40°C water into a pot, stir evenly for 4 hours, and put it in an 80°C oven for 48 hours. After calcination at high temperature, it is ground to obtain a white powder, which is the matrix material. This method is a sol-gel method to prepare the matrix material.

[0050] (2) Preparation method of fluorescent carbon quantum dots: 1.0g polyvinyl alcohol, 0.75mL ethylenediamine and 50mL deionized water can be mixed in the same proportion, put into the reactor f...

Example Embodiment

[0052] Example 2: Preparation of fluorescent carbon quantum dot / mesoporous alumina composite luminescent material

[0053] (1) The preparation of the matrix material mesoporous alumina refers to Example 1;

[0054] (2) Preparation method of fluorescent carbon quantum dots: dry fresh dried banana peels in an oven at 60°C for 10 hours, take 1.0 dried banana peels, 2mL 30% H 2 O 2 And 30mL deionized water, the same ratio can also be increased, the hydrothermal reaction is 160℃, the time is set for 6h, and the brownish yellow turbid liquid is obtained. The purification steps are: filtration, centrifugation for 15min, rotation speed 15000rpm / min, dialysis (1000D), and brown Yellow liquid. The solid carbon dots are obtained by freeze-drying. Take 1.0 g of solid carbon dots and mix with 100 mL deionized water to obtain a carbon dot solution with a concentration of 0.01 g / mL. The surface contains a large number of hydroxyl groups and the particle size is 6-8nm.

[0055] (3) Take 1.0g matrix...

Example Embodiment

[0056] Example 3: Preparation of fluorescent carbon quantum dot / mesoporous alumina composite luminescent material

[0057] (1) The preparation of the matrix material mesoporous alumina refers to Example 1;

[0058] (2) Preparation method of fluorescent carbon quantum dots: 1.0g of anhydrous citric acid, 1.0mL of ethylenediamine and 50mL of deionized water are subjected to a hydrothermal reaction, the temperature is set to 140℃, the time is set to 8h, and the hydrothermal reaction is cooled to room temperature to obtain For brown-yellow liquid, the purification steps are: filtration, centrifugation for 15 min, rotation speed of 15000 rpm / min, and dialysis (1000D) to obtain brown-yellow liquid. Freeze drying to obtain solid carbon dots. Take 1.0 g of solid carbon dots and mix with 100 mL of deionized water to obtain a carbon dot solution with a concentration of 0.01 g / mL. The surface contains a large number of hydroxyl and amino groups, and the particle size is 6-8nm.

[0059] (3) Tak...

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
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the field of a composite luminescent material, and discloses a fluorescent carbon quantum dot/mesoporous alumina composite luminescent material, and a preparation method and application thereof to the oxygen sensing aspect. The composite luminescent material comprises fluorescent carbon quantum dots and mesoporous alumina used as a substrate material, wherein the fluorescent carbon quantum dots are fluorescent carbon quantum dots containing hydroxyl or amidogen, and the size is 10nm or below. The specific surface area of the mesoporous alumina is large; the pore diameter distribution is narrow, i.e., the specific surface area/pore volume rate is high; the surface has many hydroxyl; through the hydrogen bond effect, the fluorescent carbon quantum dots with hydroxyl and amidogen at the surface can be easily adsorbed; through simple experiment operation, the fluorescent carbon quantum dots with the proper pore diameter can be assembled into a pore passage of the mesoporous alumina; the fluorescent carbon quantum dot/mesoporous alumina composite luminescent material is formed. Oxygen molecules can be uniformly dispersed in the pore passage of the mesoporous alumina; an oxygen sensing material with high luminescent stability, high sensitivity and short reaction time is formed.

Description

technical field [0001] The invention belongs to the field of composite luminescent materials, in particular to a fluorescent carbon quantum dot / mesoporous alumina composite luminescent material, a preparation method thereof and an application in oxygen sensing. Background technique [0002] Detecting the concentration of gas is ubiquitous in industry and our daily life. Traditional sensing mainly focuses on the detection of toxic or explosive gases in industrial production. In recent years, we have designed gas sensing devices mainly composed of host materials and luminescent materials to form a composite luminescent material. Considering the gas sensing mechanism of the material, the interaction between gas molecules and the surface of the matrix material affects the sensitivity and response time of the gas sensing device. Numerous studies have shown that materials with high specific surface area / pore volume ratio are suitable as host materials for gas sensing. Traditiona...

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): C09K11/65C01B32/15C01F7/02G01N21/64
CPCC01F7/02C09K11/65G01N21/64G01N2021/6417
Inventor 雷炳富何友玲张浩然刘应亮张宇
Owner SOUTH CHINA AGRI 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