Ammonia gas sensing film formed based on HPTS and hydrotalcite nanosheet, and preparation method thereof

A technology for sensing thin films and nanosheets, applied in chemical instruments and methods, fluorescence/phosphorescence, instruments, etc., can solve problems such as time-consuming, slow response time, and high cost, and achieve improved optical performance, thermal stability, and good light transmission and film-forming properties, as well as the effects of excellent reproducibility

Active Publication Date: 2021-12-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, methods based on ion chromatography, colorimetry, amperometric method, and fluorescence method to detect ammonia have been widely used, but these detection technologies have disadvantages such as complicated operation, large equipment, and high cost.
At the same time, sensing technologies for detecting ammonia based on metal oxides, graphene, carbon nanotubes, conductive polymers and other substances have also been widely studied, but there are also problems such as time-consuming, labor-intensive, and slow response time.

Method used

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  • Ammonia gas sensing film formed based on HPTS and hydrotalcite nanosheet, and preparation method thereof
  • Ammonia gas sensing film formed based on HPTS and hydrotalcite nanosheet, and preparation method thereof
  • Ammonia gas sensing film formed based on HPTS and hydrotalcite nanosheet, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] Step A: Preparation of monolayer hydrotalcite nanosheets

[0022] Hydrotalcite nanosheets were prepared by the double drop method. 0.004mol Mg(NO 3 ) 2 ·6H 2 O and 0.001mol Al(NO 3 ) 3 9H 2 O (the molar ratio is 4:1) is dissolved in the cooled, boiled, N 2 deionized water, made into a mixed salt solution, dissolved in 100mL of water; prepared a NaOH solution with a concentration of 0.25M. NaNO at a concentration of 0.01M 3 Add 100 mL of the solution and 100 mL of N,N dimethylformamide solution with a concentration of 0.01M into a three-necked flask for magnetic stirring to dissolve, and preheat to 80°C. After waiting for the temperature to stabilize, add NaOH solution dropwise to the three-necked flask to adjust the pH=10, then add the mixed salt solution and NaOH solution dropwise to the three-necked flask at the same time to control the pH=10, cool and centrifugally wash after the addition is completed, A colloidal single-layer hydrotalcite nanosheet was obta...

Embodiment 2

[0029] Step A: Preparation of monolayer nanosheet hydrotalcite

[0030] Hydrotalcite nanosheets were prepared by the double drop method. 0.003mol Mg(NO 3 ) 2 ·6H 2 O and 0.001mol Al(NO 3 ) 3 9H 2 O (molar ratio is 3:1) dissolves in cooled, boiled, N 2 , deionized water, made a mixed salt solution and dissolved in 100mL water; prepared a NaOH solution with a concentration of 0.25M. NaNO at a concentration of 0.01M 3 Add 100 mL of the solution and 100 mL of N,N dimethylformamide solution with a concentration of 0.01M into a three-necked flask for magnetic stirring to dissolve, and preheat to 75°C. After waiting for the temperature to be stable, add NaOH solution dropwise to the three-necked flask to adjust the pH=10.5, then add the mixed salt solution and NaOH solution dropwise to the three-necked flask at the same time to control the pH=10, cool and centrifugally wash after the addition is completed, A colloidal single-layer hydrotalcite nanosheet was obtained.

[003...

Embodiment 3

[0036] Step A: Preparation of monolayer nanosheet hydrotalcite

[0037] Hydrotalcite nanosheets were prepared by the double drop method. 0.002mol Mg(NO 3 ) 2 ·6H 2 O and 0.001mol Al(NO 3 ) 3 9H 2 O (mole ratio is 2:1) dissolved in the cooled boiled and passed through N 2 prepared a mixed salt solution in 100mL of deionized water; prepared a NaOH solution with a concentration of 0.25M. NaNO at a concentration of 0.01M 3 Add 100 mL of the solution and 100 mL of N,N dimethylformamide solution with a concentration of 0.01M into a three-neck flask for magnetic stirring to dissolve, and preheat to 70°C. After waiting for the temperature to be stable, add NaOH solution dropwise to the three-necked flask to adjust the pH=10, then add the mixed salt solution and NaOH solution dropwise to the three-necked flask at the same time to control the pH=9.5, cool and centrifugally wash after the addition is completed, A colloidal single-layer hydrotalcite nanosheet was obtained.

[00...

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Abstract

The invention discloses an ammonia gas sensing film formed based on HPTS and hydrotalcite nanosheets, and a preparation method thereof. The film is prepared from three components which are HPTS, hydrotalcite nanosheets and polyvinyl alcohol through a solvent evaporation method. HPTS molecules are fixed and dispersed by the hydrotalcite nanosheets and the polyvinyl alcohol, so that the vibration and rotation of the HPTS molecules are reduced, and the HPTS molecules show excellent fluorescence performance. The prepared ammonia gas sensing film has good light transmission and film-forming property, compared with an HPTS aqueous solution, the ammonia gas sensing film shows a wide linear detection range and a low detection limit when applied to ammonia gas sensing, the detection limit can reach 0.1-0.01 ppm, and the film has excellent repeatable detectability, fluorescence property and illumination stability.

Description

technical field [0001] The invention belongs to the technical field of preparation of a thin film sensor for detecting ammonia, in particular to an ammonia sensing thin film based on HPTS and hydrotalcite nanosheets and a preparation method thereof. Background technique [0002] Ammonia is a colorless, highly toxic gas with a pungent odor. Because it may affect the immune system or inhibit cell growth, it is very harmful to the human body. At a concentration of 25ppm NH 3 The human body's tolerance limit is 8 hours at low concentrations; while at a concentration of 35ppm, the human body's tolerance limit is only 15 minutes. Therefore, it is necessary to develop a sensor for detecting low-concentration ammonia. At present, methods based on ion chromatography, colorimetry, amperometric method, and fluorescence method for ammonia detection have been widely used, but these detection techniques have disadvantages such as complex operation, large equipment, and high cost. At t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06G01N21/64C01F7/00
CPCC09K11/06G01N21/6428
Inventor 史文颖孔健
Owner BEIJING UNIV OF CHEM TECH
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