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Preparation method of sensitive material with specificity to formaldehyde gas

A formaldehyde gas and sensitive material technology, applied in the direction of analysis of materials, material resistance, material analysis through electromagnetic means, etc., can solve the problems of selectivity and anti-interference ability to be improved, and achieve the promotion of carrier separation and transfer, preparation Simple steps and high sensitivity results

Inactive Publication Date: 2020-03-17
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, due to its universal surface contact-redox gas sensing mechanism, its selectivity and anti-interference ability in a mixed atmosphere need to be improved.

Method used

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  • Preparation method of sensitive material with specificity to formaldehyde gas
  • Preparation method of sensitive material with specificity to formaldehyde gas
  • Preparation method of sensitive material with specificity to formaldehyde gas

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preparation example Construction

[0022] A method for preparing a sensitive material specific to formaldehyde gas provided by the invention comprises the following steps:

[0023] 1) Weigh 30mg of graphene oxide, add it into 15mL of deionized water, and carry out ultrasonic dispersion, the ultrasonic power is 80-100W, and the time is 4h, to obtain GO suspension A;

[0024] 2) Mix 1mmol citric acid, 300mg glucose and 1-3mmol SnCl 2 2H 2 O was added to 15mL deionized water, and stirred vigorously on a magnetic stirrer until all soluble matter was dissolved to obtain solution B;

[0025] 3) Mix suspension A with solution B so that GO and SnCl 2 2H 2 The mass ratio of O is 1:5 to 1:25, and then urea and ammonia water are added in a certain proportion, so that the mass ratio of GO to urea is 1:100 to 1:300, that is, the mass of urea is 3-9g, so that urea The molar ratio to ammonia water is 3:1-1:3, that is, the volume of ammonia water is 0.7-17.3mL, and mixed solution C is obtained;

[0026] 4) Then transfer t...

Embodiment 1

[0031] 1) Weigh 30mg of graphene oxide, add it into 15mL deionized water, and carry out ultrasonic dispersion, the ultrasonic power is 400W, and the time is 4h, to obtain GO suspension A;

[0032] 2) 1mmol of citric acid, 300mg of glucose and 2mmol of SnCl 2 2H 2 O was added to 15mL deionized water, and stirred vigorously on a magnetic stirrer until all soluble matter was dissolved to obtain solution B;

[0033] 3) Mix suspension A with solution B so that GO and SnCl 2 2H 2 The mass ratio of O is 1:15, then add urea and ammoniacal liquor, make the mass ratio of GO and urea in the solution be 1:100, promptly urea quality is 3g, and the molar ratio of ammoniacal liquor and urea is 3:1, promptly ammoniacal liquor volume is 0.7mL to obtain mixed solution C;

[0034] 4); Then transfer the solution C to the reaction kettle, install it in the microwave / ultraviolet / ultrasonic three-in-one reactor, and use the pressure control mode to carry out the microwave hydrothermal reaction, ...

Embodiment 2

[0037] 1) Weigh 30 mg of graphene oxide, add it into 15 mL of deionized water, and carry out ultrasonic dispersion, the ultrasonic power is 500W, and the time is 4h, to obtain GO suspension A;

[0038] 2) 1mmol of citric acid, 300mg of glucose and 1mmol of SnCl 2 2H 2 O was added to 15mL deionized water, and stirred vigorously on a magnetic stirrer until all soluble matter was dissolved to obtain solution B;

[0039] 3) Mix suspension A with solution B so that GO and SnCl 2 2H 2 The mass ratio of O is 1:7.5, then add urea and ammoniacal liquor, make the mass ratio of GO and urea in the solution be 1:200, promptly urea quality is 6g, and the molar ratio of ammoniacal liquor and urea is 1:1, promptly ammoniacal liquor volume is 3.9mL to obtain mixed solution C;

[0040] 4) Then transfer the solution C to the reaction kettle, install it in the microwave / ultraviolet / ultrasonic three-in-one reactor, and use the pressure control mode to carry out the microwave hydrothermal react...

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Abstract

The invention relates to a preparation method of a sensitive material with specificity to formaldehyde gas. The method comprises the following steps: mixing a graphene oxide suspension with a solutioncontaining citric acid, glucose and SnCl2.2H2O, and adding urea and ammonia water to obtain a mixed solution; and carrying out microwave hydrothermal reaction on the mixed solution in a microwave / ultraviolet / ultrasonic three-in-one reaction instrument in a pressure control mode, and carrying out ultrasonic treatment; and then obtaining a formaldehyde gas sensitive material after microwave hydrothermal reaction. According to the invention, the SnO2 and NG are compounded and the concentrations and distribution states of pyridine nitrogen, graphite nitrogen and pyrrole nitrogen in NG are controlled by adjusting reaction medium compositions and the microwave hydrothermal preparation process, so that specific binding of formaldehyde molecules and the composite material is facilitated and thusa strong response mechanism is generated. With the heterojunction formed by SnO2 and NG, the carrier separation and transferring are promoted, the sensitivity and the response speed of the material are effectively improved, and the prepared composite material has high selectivity to formaldehyde gas.

Description

technical field [0001] The invention relates to a preparation method of a sensitive material specific to formaldehyde gas. Background technique [0002] Tin dioxide is an N-type semiconductor gas-sensing material with excellent performance. It has high sensitivity to oxidizing, reducing, and volatile organic compound gases. However, due to its universal surface contact-redox gas sensing mechanism, its selectivity and anti-interference ability in a mixed atmosphere need to be improved. [0003] As an important derivative of graphene, nitrogen-doped graphene oxide has the characteristics of large specific surface area and strong adsorption capacity, and due to nitrogen doping, there are more active adsorption sites in the carbon network, which has great potential in the field of gas sensors. potential. Contents of the invention [0004] The purpose of the present invention is to provide a method for preparing a sensitive material specific to formaldehyde gas, which has the...

Claims

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Application Information

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IPC IPC(8): G01N27/12C01G19/02
CPCC01G19/02G01N27/125
Inventor 卢靖王亚军徐灿李翠艳黄剑锋
Owner SHAANXI UNIV OF SCI & TECH
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