Graphene quantum dot-ZnO composite gas-sensitive material with high sensitivity to acetic acid gas

A technology of graphene quantum dots and gas-sensing materials, applied in the direction of material resistance, can solve the problems of expensive and time-consuming, and achieve the effect of rapid detection

Inactive Publication Date: 2016-06-22
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for measuring the concentration of acetic acid in the air mainly use gas chromatography and ion chromatography, etc. These methods require relatively expensive instruments and equipment, and sampling and analysis take a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh 2.22gZn(NO 3 ) 2 ·6H 2 O was dissolved in 20mL of deionized water, and 10ml of graphene quantum dot solution was slowly added to the above solution, stirred for 30min, and the mixed solution was sonicated to obtain a suspension. Then 1 mol / L NaOH solution was added dropwise to the suspension until the pH of the reaction solution was 7.0. Subsequently, the reaction solution was transferred to a hydrothermal kettle with a volume of 50 mL and reacted at 140°C for 8 hours. After the reaction kettle was cooled, the product was washed with deionized water and absolute ethanol several times, and the washed precipitate was put into an oven at 60 Bake at ℃ for 24 hours to obtain a graphene quantum dot-ZnO composite material. The material was analyzed by thermogravimetric analysis, and in the composite material, the content of graphene quantum dots was 10%.

[0014] The material is made into a side-heated element, and the highest sensitivity of the element to 0.01, 0.1,...

Embodiment 2

[0016] Weigh 2.22gZn(NO 3 ) 2 ·6H 2 O was dissolved in 20mL of deionized water, and 15ml of graphene quantum dot solution was slowly added to the above solution, stirred for 30min, and the mixed solution was sonicated to obtain a suspension. Then 1 mol / L NaOH solution was added dropwise to the suspension until the pH of the reaction solution was 7.0. Subsequently, the reaction solution was transferred to a hydrothermal kettle with a volume of 50 mL and reacted at 180° C. for 12 hours. After the reaction kettle was cooled, the product was washed with deionized water and absolute ethanol several times, and the washed precipitate was put into an oven at 60 Bake at ℃ for 24 hours to obtain a graphene quantum dot-ZnO composite material. The material was analyzed by thermogravimetric analysis, and in the composite material, the content of graphene quantum dots was 15%.

[0017] The material was made into a side-heating element, and the highest sensitivity of the element to 0.01,...

Embodiment 3

[0019] Weigh 2.22gZn(NO 3 ) 2 ·6H 2 O was dissolved in 20mL of deionized water, and 15ml of graphene quantum dot solution was slowly added to the above solution, stirred for 30min, and the mixed solution was sonicated to obtain a suspension. Then 1 mol / L NaOH solution was added dropwise to the suspension until the pH of the reaction solution was 7.0. Subsequently, the reaction solution was transferred to a hydrothermal kettle with a volume of 50 mL and reacted at 180° C. for 16 hours. After the reaction kettle was cooled, the product was washed with deionized water and absolute ethanol several times, and the washed precipitate was put into an oven at 60 Bake at ℃ for 24 hours to obtain a graphene quantum dot-ZnO composite material. The material was analyzed by thermogravimetric analysis, and in the composite material, the content of graphene quantum dots was 15%.

[0020] The material is made into a side-heating element, and the highest sensitivity of the element to 0.01, ...

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Abstract

The invention discloses a graphene quantum dot-ZnO composite gas-sensitive material with high sensitivity to acetic acid gas and belongs to the technical field of gas-sensitive materials. The gas-sensitive material is prepared from ZnO and graphene quantum dots, wherein the mass of the graphene quantum dots accounts for 10% to 20% the total mass of the gas-sensitive material. A heater type gas sensor made by using the material as a sensitive material has the sensitivity (the ratio of element resistance in air to element resistance in detected gas) of 2 to 2.6 to 0.01ppm acetic acid at the working temperature of 300 DEG C and the sensitivity of 590 to 620 to 1,000ppm acetic acid, has the average response recovery time shorter than 45 seconds and can achieve rapid detection on concentration of the acetic acid in the air.

Description

technical field [0001] The invention belongs to the technical field of gas-sensing materials, in particular to a graphene quantum dot-ZnO composite gas-sensing material with high sensitivity to acetic acid gas. The gas sensor made of the gas sensitive material has high sensitivity and good selectivity to low concentration acetic acid in the air. technical background [0002] Acetic acid is a volatile, colorless liquid with a strong pungent smell. It is highly corrosive and can cause skin and mucous membranes to blister, redness, and swelling. When the concentration is high, it can cause rhinitis and bronchitis. In severe cases, acute chemical reactions may occur. pneumonia. At present, acetic acid is widely used in chemical enterprises, and more and more enterprises are involved in monitoring the concentration of acetic acid in environmental impact assessment and acceptance monitoring. The health standard of the United States, Japan and other countries is 25mg / m 3 (about ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
CPCG01N27/04
Inventor 储向峰胡韬董永平白林山秦琪
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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