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Preparation method for fluorescent carbon quantum dot/SiO2/inorganic fluorescent powder ternary composite temperature sensing material

A technology of carbon quantum dots and ternary compounding, which is applied to luminescent materials, thermometers with physical/chemical changes, thermometers, etc., can solve the problems of small detection temperature range, long time-consuming, cumbersome production process, etc., and achieve fast response speed , short time-consuming, low-cost effect

Active Publication Date: 2015-08-12
SOUTH CHINA AGRI UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Existing fluorescent ratio materials have a small detection temperature range, and the production process is cumbersome and time-consuming

Method used

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  • Preparation method for fluorescent carbon quantum dot/SiO2/inorganic fluorescent powder ternary composite temperature sensing material
  • Preparation method for fluorescent carbon quantum dot/SiO2/inorganic fluorescent powder ternary composite temperature sensing material
  • Preparation method for fluorescent carbon quantum dot/SiO2/inorganic fluorescent powder ternary composite temperature sensing material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] Carbon quantum dots / SiO 2 / SrAl 2 o 4 : Preparation of Eu, Dy long-lasting phosphor ternary composite material, the specific steps are as follows:

[0036] (1) Preparation of silane-functionalized fluorescent carbon quantum dots: under the condition of nitrogen protection, preheat 200mL N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane in vacuum to 240°C, and Quickly add 8 g of anhydrous citric acid while stirring, take it out after 5 minutes of constant temperature reaction, and cool it down to room temperature naturally. After the crude product is purified three times with petroleum ether, the final silane-functionalized fluorescent carbon quantum dots are obtained;

[0037] (2) Preparation of prehydrolyzed tetraethyl orthosilicate solution: put 55mL tetraethyl orthosilicate solution, 55mL absolute ethanol, 3.5mL distilled water, and 1mL hydrochloric acid solution with pH=2 in a round bottom flask, at 80°C Reflux for 90 min, cool to room temperature, let stand for 15 ...

Embodiment 2

[0046] Carbon quantum dots / SiO 2 / CaAl 12 o 19 :Mn 4+ The preparation of the red phosphor ternary composite material, the specific steps are as follows:

[0047] (1) Preparation of silane-functionalized fluorescent carbon quantum dots: under nitrogen protection, preheat 200mL N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane in vacuum to 240°C, Quickly add 8 g of anhydrous citric acid while stirring, take it out after constant temperature reaction for 5 minutes, and cool it down to room temperature naturally. After the crude product is purified three times with petroleum ether, the final silane-functionalized fluorescent carbon quantum dots are obtained;

[0048] (2) Preparation of prehydrolyzed tetraethyl orthosilicate solution: put 55mL tetraethyl orthosilicate solution, 55mL absolute ethanol, 3.5mL distilled water, and 1mL hydrochloric acid solution with pH=2 in a round bottom flask, at 80°C Reflux for 90 min, cool to room temperature, let stand for 15 min, then add 18 mL ...

Embodiment 3

[0055] Carbon quantum dots / SiO 2 / Y 3 al 5 o 12 : Ce 3+ (YAG:Ce) The preparation of the yellow phosphor ternary composite material, the specific steps are as follows:

[0056] (1) Preparation of silane-functionalized fluorescent carbon quantum dots: under the condition of nitrogen protection, preheat 200mL N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane in vacuum to 240°C, and Quickly add 8 g of anhydrous citric acid while stirring, take it out after 5 minutes of constant temperature reaction, and cool it down to room temperature naturally. After the crude product is purified three times with petroleum ether, the final silane-functionalized fluorescent carbon quantum dots are obtained;

[0057] (2) Preparation of prehydrolyzed tetraethyl orthosilicate solution: put 55mL tetraethyl orthosilicate solution, 55mL absolute ethanol, 3.5mL distilled water, and 1mL hydrochloric acid solution with pH=2 in a round bottom flask, at 80°C Reflux for 90 min, cool to room temperature, le...

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Abstract

The invention discloses a preparation method for a fluorescent carbon quantum dot / SiO2 / inorganic fluorescent powder ternary composite temperature sensing material, and belongs to the field of composite functional material. According to the preparation method, anhydrous citric acid and organosilane are used as raw materials for synthesis of silane functionalized fluorescent carbon quantum dots, a sol-gel method is adopted, a hydrolytic copolycondensation reaction is carried out with tetraethoxysilane, and thus the fluorescent carbon quantum dot / SiO2 / inorganic fluorescent powder ternary composite material is obtained. In the temperature range of 100-440 K, the ratio of the fluorescent carbon quantum dots of the composite material to the fluorescence intensity of a fluorescent powder of the composite material has good linear relationship with the temperature, so that a way based on fluorescence thermal quenching is provided for temperature sensing detection. The fluorescent carbon quantum dot / SiO2 / inorganic fluorescent powder ternary composite temperature sensing material has the obvious advantages of high stability, fast response, high sensitivity and the like, and has good application prospects.

Description

technical field [0001] The invention belongs to the field of composite functional materials, in particular to a fluorescent carbon quantum dot / SiO 2 / The preparation method of inorganic fluorescent powder ternary composite temperature sensing material. Background technique [0002] Temperature is one of the most basic parameters in many research and production fields. The importance of temperature measurement can be seen everywhere in scientific research and daily life. Almost all chemical processes and reaction processes are related to temperature. Various fields rely to varying degrees on accurate and reliable temperature information to ensure the effective and reliable operation of the system. Especially in some inaccessible or harsh environments, such as radio frequency radiation or other electromagnetic noise interference environments, optical sensing materials are required for temperature measurement. [0003] Materials and technologies for sensing or detecting indi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/80G01K11/00
Inventor 雷炳富李唯张浩然刘应亮肖勇郑明涛董汉武
Owner SOUTH CHINA AGRI UNIV
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