Gas sensitive material for ammonia gas detection, preparation method of gas sensitive material, gas sensitive electrode and sensor

A gas-sensing material, ammonia technology, applied in the direction of material resistance, material analysis, material analysis through electromagnetic means, etc., can solve the problems of destroying the electrical properties of graphene, poor responsiveness and selectivity, etc.

Pending Publication Date: 2021-04-30
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the response and selectivity of unmodified graphene to gases are poor, and the traditional covalent modification will de

Method used

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  • Gas sensitive material for ammonia gas detection, preparation method of gas sensitive material, gas sensitive electrode and sensor
  • Gas sensitive material for ammonia gas detection, preparation method of gas sensitive material, gas sensitive electrode and sensor
  • Gas sensitive material for ammonia gas detection, preparation method of gas sensitive material, gas sensitive electrode and sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A gas sensitive material for ammonia detection, such as figure 1 Shown, its preparation method comprises the following steps:

[0032] S1, the polystyrene sodium sulfonate (PSS) of 80mg is dissolved in 10mL deionized water and adds in the one-necked flask of 50mL, adds 4mL graphene oxide dispersion liquid (1mg / mL) in the one-necked flask, obtains mixed liquor; Add 10 mL of hydrazine hydrate (1.12 μL / mL) to the mixture and react at 80 °C for 1 h to obtain PSS functionalized graphene; filter the product to remove excess hydrazine hydrate and free PSS, and then redisperse it in 10 mL of deionized In water, a stable supramolecular assembly dispersion is obtained; then the supramolecular assembly dispersion is subjected to freeze-drying treatment to obtain polystyrene sodium sulfonate-modified reduced graphene microspheres, that is, PSS functionalized graphene microspheres;

[0033]S2. Disperse the reduced graphene microspheres modified by 10 mg of sodium polystyrene sulfon...

Embodiment 2

[0035] A gas-sensitive material for ammonia detection, the preparation method of which comprises the following steps:

[0036] S1, the polystyrene sodium sulfonate (PSS) of 100mg is dissolved in 10mL deionized water and adds in the one-necked flask of 50mL, adds 4mL graphene oxide dispersion liquid (1mg / mL) in the one-necked flask, obtains mixed liquor; Add 10 mL of hydrazine hydrate (1.12 μL / mL) to the mixture and react at 80 °C for 1 h to obtain PSS functionalized graphene; filter the product to remove excess hydrazine hydrate and free PSS, and then redisperse it in 10 mL of deionized In water, obtain a stable supramolecular assembly dispersion; then freeze-dry the supramolecular assembly dispersion to obtain polystyrene sodium sulfonate-modified reduced graphene microspheres, that is, PSS functionalized graphene microspheres;

[0037] S2, disperse the reduced graphene microspheres modified by sodium polystyrene sulfonate prepared by 10mg step S1 in 90mL sulfuric acid soluti...

Embodiment 3

[0039] A gas-sensitive material for ammonia detection, the preparation method of which comprises the following steps:

[0040] S1, the polystyrene sodium sulfonate (PSS) of 100mg is dissolved in 10mL deionized water and adds in the one-necked flask of 50mL, adds 4mL graphene oxide dispersion liquid (1mg / mL) in the one-necked flask, obtains mixed liquor; Add 10 mL of hydrazine hydrate (1.12 μL / mL) to the mixture and react at 80 °C for 1 h to obtain PSS functionalized graphene; filter the product to remove excess hydrazine hydrate and free PSS, and then redisperse it in 10 mL of deionized In water, obtain a stable supramolecular assembly dispersion; then freeze-dry the supramolecular assembly dispersion to obtain polystyrene sodium sulfonate-modified reduced graphene microspheres, that is, PSS functionalized graphene microspheres;

[0041] S2, disperse the reduced graphene microspheres modified by sodium polystyrene sulfonate prepared by 9 mg of step S1 in 1 mL of sulfuric acid ...

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Abstract

The invention discloses a gas sensitive material for ammonia gas detection, a preparation method of the gas sensitive material, a gas sensitive electrode and a sensor. The gas sensitive material for ammonia gas detection comprises functionalized graphene microspheres and polyaniline coating the functionalized graphene microspheres, and the functionalized graphene microspheres are reduced graphene microspheres modified by sodium polystyrenesulfonate. The gas sensitive material for ammonia gas detection can quickly respond and restore to low-concentration ammonia gas at room temperature, and is high in reaction sensitivity and low in detection limit.

Description

technical field [0001] The invention relates to the technical field of gas-sensing materials, in particular to a gas-sensing material for detecting ammonia gas, a preparation method thereof, a gas-sensing electrode and a sensor. Background technique [0002] With the development of intelligent manufacturing, people pay more and more attention to monitoring their own health. Human breath contains high humidity and a large number of gas compounds with concentrations ranging from a few ppt to thousands of ppm. The composition is very complex and depends on health status, age and gender, etc. Ammonia (NH 3 ) is a protein breath product that is generally converted to urea by the liver and excreted by the kidneys. When NH 3 When the concentration rises from hundreds of ppb to a certain ppm, it indicates liver / kidney failure. Studies have shown that the human body exhales NH 3 A concentration of less than 1.1ppm is considered healthy, and more than 1.6ppm is considered unhealt...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/126G01N27/127
Inventor 王耀梁红萍周国富
Owner SOUTH CHINA NORMAL UNIVERSITY
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