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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few literatures reporting solid-state luminescence of fluorescent carbon quantum dots, which limits the application of carbon dots in light-emitting devices.

Method used

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  • 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
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Effect test

Embodiment 1

[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 of anhydrous citric acid, 15mL of absolute ethanol as a solvent, stir to obtain a transparent solution, hydrochloric acid and glacial acetic acid to adjust the pH value to 2~ 3. Add 10mmol aluminum isopropoxide as the aluminum source, stir well at room temperature for 10h to obtain a white milk, transfer it to 40°C water into a pot, stir evenly for 4h, and put it in an 80°C oven for 48h. After high-temperature calcination, it is ground to obtain a white powder, which is the matrix material. The method is a sol-gel method to prepare the matrix material.

[0050] (2) Preparation method of fluorescent carbon quantum dots: 1.0g of polyvinyl alcohol, 0.75mL of ethylenediamine and 50mL of deionized water can be added in the same proportion. Set 10h. A brownish-yellow ...

Embodiment 2

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

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

[0054] (2) Preparation method of fluorescent carbon quantum dots: dry fresh dried banana peel in an oven at 60°C for 10 hours, take 1.0 dried banana peel, 2mL 30%H 2 o 2 and 30mL deionized water, the same ratio can also be increased, the hydrothermal reaction is carried out at 160°C, and the time is set for 6h to obtain a brownish-yellow turbid liquid. yellow liquid. Freeze-dry to obtain solid carbon dots. Take 1.0 g of solid carbon dots and add 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 groups and the particle size is 6-8 nm.

[0055] (3) Take 1.0g of matrix material, add 1.0mL 0.01g / mL luminescent carbon quantum dots, stir rapidly for 5h, filter, dry in an oven at 60°C, and ...

Embodiment 3

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

[0057] (1) The preparation of 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 hydrothermal reaction, the temperature is set at 140°C, and the time is set for 8h. After the hydrothermal reaction, cool to room temperature to obtain Brown-yellow liquid, the purification steps are as follows: filter, centrifuge for 15 minutes at a speed of 15000 rpm / min, and dialyze (1000D) to obtain a brown-yellow liquid. Freeze-dry 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 groups and amino groups, and the particle size is 6-8 nm.

[005...

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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

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Application Information

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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
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