Carbon dot and hydrotalcite-based pressed color-changing light-emitting sensor film and preparation method thereof

A technology for suppressing discoloration and hydrotalcite, applied in the direction of hydrotalcite, discoloration fluorescent materials, chemical instruments and methods, etc., can solve the problems of molecular structure destruction, fluorescence quenching, etc., achieve good sensitivity, improve sensitivity, and reduce non-radiative transitions Effect

Active Publication Date: 2021-01-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most CDs in the powder state may exhibit the ACQ effect, and their molecular structure will be destroyed under high pressure, resulting in fluorescence quenching

Method used

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  • Carbon dot and hydrotalcite-based pressed color-changing light-emitting sensor film and preparation method thereof
  • Carbon dot and hydrotalcite-based pressed color-changing light-emitting sensor film and preparation method thereof
  • Carbon dot and hydrotalcite-based pressed color-changing light-emitting sensor film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Preparation of magnesium aluminum nitrate hydrotalcite by hydrothermal method: weigh 11.53g Mg(NO 3 ) 2 ·6H 2 O and 5.63g Al(NO 3 ) 3 9H 2 O (the molar ratio is 3:1) is dissolved in 90mL of water and poured into the three-necked flask; the NaOH solution with a concentration of 2M is slowly added dropwise to the three-necked flask, and the titration is completed after maintaining the pH=8.5; the solution in the three-necked flask is poured into In a high-pressure reaction kettle, the temperature is 100°C, and the time is 18h; after the reaction kettle is cooled to room temperature, the jelly is centrifuged and the precipitate is washed with water 4 times; the jelly is poured into a watch glass, and placed in a 50°C vacuum drying Box, dried into powder and taken out for use.

[0022] 2) Synthesis of intercalated hydrotalcite: Weigh the sample (0.012mol of 3-aminobenzenesulfonic acid) and dissolve it in 100mL of water, pour it into a three-necked flask; weigh 1.0g ...

Embodiment 2

[0027] 1) Magnesium aluminum nitrate hydrotalcite was prepared by hydrothermal method: 7.68g Mg(NO 3 ) 2 ·6H 2 O and 5.63g Al(NO 3 ) 3 9H 2 O (the molar ratio is 2:1) is dissolved in 100mL water and poured into the three-necked flask; the concentration is slowly added dropwise to the three-necked flask with a concentration of 2M NaOH solution, and the titration is completed after maintaining the pH=8.3; the solution in the three-necked flask is poured into In a high-pressure reaction kettle, the temperature is 110°C, and the time is 16h; after the reaction kettle is cooled to room temperature, the jelly is centrifuged and the precipitate is washed with water 4 times; the jelly is poured into a watch glass, and placed in a 60°C vacuum drying Box, dried into powder and taken out for use.

[0028] 2) Synthesis of intercalated hydrotalcite: weigh the sample (0.018mol of 3-aminobenzenesulfonic acid) and dissolve it in 110mL of water, pour it into a three-necked flask; weigh 1....

Embodiment 3

[0032] 1) Zinc-aluminum nitrate hydrotalcite was prepared by hydrothermal method: weigh 13.40g Zn(NO 3 ) 2 ·6H 2 O and 5.63g Al(NO 3 ) 3 9H 2 O (3:1 molar ratio) was dissolved in 150 mL of water and poured into a three-necked flask. Slowly add NaOH solution with a concentration of 2M to the three-necked flask, maintain the pH=6.5, and then end the titration. After the reactor was cooled to room temperature, the jelly was centrifuged and the precipitate was washed 6 times with water. Pour the jelly into a watch glass, place it in a vacuum oven at 70°C, dry it into powder, and take it out for use.

[0033] 2) Synthesis of intercalated hydrotalcite: Weigh the sample (0.020 mol of 3-aminobenzenesulfonic acid) and dissolve it in 130 mL of water, and pour it into a three-necked flask. Weigh 1.5g of zinc-aluminum nitrate hydrotalcite and place it in a three-necked flask, stir at 75°C for 75 hours and always pass nitrogen gas, wash the precipitate obtained after centrifugation ...

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Abstract

The invention discloses a piezochromic light-emitting sensor film formed on the basis of carbon dots and hydrotalcite and a preparation method thereof. The film is prepared from three raw materials, namely 3-aminobenzenesulfonic acid, layered double hydroxide and polyvinyl alcohol. The film prepared by the invention has dual emission (fluorescence and phosphorescence) behaviors of CDs, and when apressure sensing test is carried out, the film has a linear relationship with the pressure in the aspects of fluorescence and phosphorescence; after the film is pressed, the film can return to the original state through heating in a short time; after the film is irradiated for 1h under UV light, the fluorescence intensity and the phosphorescence intensity of the film are only reduced to about 80%of original values; good sensitivity, reversibility and light (fluorescence and phosphorescence) stability to external pressure are shown. The film with dual emission performance greatly improves thesensitivity of the sensor.

Description

technical field [0001] The invention belongs to the technical field of preparation of a pressed color-changing luminescent sensor, and in particular relates to a pressed color-changing light-emitting sensor film based on carbon dots and hydrotalcite and a preparation method thereof. Background technique [0002] Piezochromic luminescent (PCL) materials have promising applications in mechanical sensors and optoelectronic devices. The change in their optical signal is mainly achieved by adjusting the way the molecules pack while keeping the chemical structure unchanged. Typically, molecular packing patterns are determined by weak intermolecular interactions, such as π-π interactions and hydrogen bonds. Therefore, phase transitions in solids usually occur due to weak driving forces such as shear stress or grinding stress, which can easily achieve significant changes in optical properties. However, current PCL materials suffer from problems such as the aggregation quenching (A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L29/04C08K3/04C08K3/26C09K11/65C09K11/02C09K9/00C01F7/00C01B32/15G01N21/64
CPCC08J5/18C09K11/65C09K11/025C09K9/00C01B32/15G01N21/6402C08J2329/04C08K3/04C08K3/26C01F7/785
Inventor 史文颖邢霞
Owner BEIJING UNIV OF CHEM TECH
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