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Graphene-ZnGa2O4 compound gas-sensitive material with high selectivity on formaldehyde gas

A technology of -znga2o4 and gas-sensing materials, which is applied in the field of graphene-ZnGa2O4 composite gas-sensing materials, can solve the problems of no report on gas-sensing selectivity, no description of component interference gas sensitivity, no description of component gas-sensing selectivity, etc., to achieve The effect of high gas selectivity

Inactive Publication Date: 2019-03-19
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhang Ting et al disclosed (patent authorization announcement number CN 103043731 B) a formaldehyde gas sensor, the material of which is at least composed of nickel oxide. Describe the gas selectivity of the element
He Dannong et al. disclosed (patent application publication number CN 107879381A) a formaldehyde gas sensor. The gas sensitive material is a Sn single atom modified NiO nanomaterial. sensitivity selectivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 0.002molGa(NO 3 ) 3 9H 2 O and 0.001molZn(NO 3 ) 2 ·6H 2 O was dissolved in 30ml of deionized water, 2.1ml of graphene suspension with a concentration of 0.1mg / ml was added, ultrasonically dispersed for 1 hour, and NaOH solution with a concentration of 0.5mol / L was added dropwise while stirring until pH = 13.5, and the mixture was transferred to In a high-pressure reaction kettle with a volume of 100ml and polytetrafluoroethylene, keep it warm at 170°C for 12 hours, let the reaction kettle cool down to room temperature naturally, filter the product, wash the precipitate with deionized water and ethanol, and dry it in vacuum at 60°C. A gas-sensitive material (0.08% by mass of graphene) was obtained.

[0015] The material is made into a side-heating element, and the sensitivity of the element to 1ppm, 10ppm, 100ppm, and 1000ppm formaldehyde at a working temperature of 203°C is measured to be 1.1, 4.0, 17, and 29, respectively. However, the sensitivity to 1000ppm ace...

Embodiment 2

[0017] 0.002molGa(NO 3 ) 3 9H 2 O and 0.001molZn(NO 3 ) 2 ·6H 2 O was dissolved in 30ml of deionized water, 2.7ml of graphene suspension with a concentration of 0.1mg / ml was added, ultrasonically dispersed for 1 hour, while stirring, NaOH solution with a concentration of 0.5mol / L was added dropwise to pH=13.5, and the mixture was transferred to In a high-pressure reaction kettle with a volume of 100ml and polytetrafluoroethylene, keep it warm at 170°C for 12 hours, let the reaction kettle cool down to room temperature naturally, filter the product, wash the precipitate with deionized water and ethanol, and dry it in vacuum at 60°C. A gas-sensitive material (0.1% by mass of graphene) was obtained.

[0018] The material is made into a side-heating element, and the sensitivity of the element to 1ppm, 10ppm, 100ppm, and 1000ppm formaldehyde at a working temperature of 203°C is measured to be 1.2, 4.3, 18, and 33, respectively. However, the sensitivity to 1000ppm acetone, 100...

Embodiment 3

[0020] 0.002molGa(NO 3 ) 3 9H 2 O and 0.001molZn(NO 3 ) 2 ·6H 2 O was dissolved in 30ml of deionized water, 4.0ml of graphene suspension with a concentration of 0.1mg / ml was added, ultrasonically dispersed for 1 hour, while stirring, NaOH solution with a concentration of 0.5mol / L was added dropwise to pH=13.5, and the mixture was transferred to In a high-pressure reaction kettle with a volume of 100ml and polytetrafluoroethylene, keep it warm at 170°C for 12 hours, let the reaction kettle cool down to room temperature naturally, filter the product, wash the precipitate with deionized water and ethanol, and dry it in vacuum at 60°C. A gas-sensitive material (0.15% by mass of graphene) was obtained.

[0021] The material is made into a side-heating element, and the sensitivity of the element to 1ppm, 10ppm, 100ppm, and 1000ppm formaldehyde at a working temperature of 203°C is measured to be 1.1, 4.2, 17, and 31, respectively. However, the sensitivity to 1000ppm acetone, 10...

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Abstract

The invention discloses a graphene-ZnGa2O4 compound gas-sensitive material with high selectivity on a formaldehyde gas, and belongs to the technical field of gas-sensitive materials. The gas-sensitivematerial is prepared from graphene-ZnGa2O4, wherein the graphene is 0.08-0.20 percent of total mass of the material. A heater type gas-sensitive sensor prepared by using the material as a sensitive material has the lowest detection limit on formaldehyde being 1ppm, the sensitivity on 1ppm formaldehyde be 1.1-1.2, the sensitivity on 1000ppm formaldehyde being 29-33 and the response time and recovery time on 1-1000ppm formaldehyde being not more than 21 seconds and 25 seconds ; and the material has high gas-sensitive selectivity since the sensitivity on 1000ppm acetone, 1000ppm trimethylamine,1000ppm acetaldehyde, 1000ppm ammonia and the like is respectively less than 2.5 at the same working temperature.

Description

technical field [0001] The invention belongs to the technical field of gas sensitive materials, in particular to a graphene-ZnGa with high selectivity to formaldehyde gas 2 o 4 Composite gas sensitive material. The material is used to make a gas sensor, and the made gas sensor has high sensitivity and high selectivity to low-concentration formaldehyde in the air. technical background [0002] Formaldehyde is a gas with a strong pungent smell, easily soluble in water, and its 40% aqueous solution is called formalin. The impact of formaldehyde on human health is mainly manifested in olfactory stimulation, allergies, abnormal lung function, abnormal liver function and immune function. exception etc. Long-term exposure to low-dose formaldehyde can cause chronic respiratory diseases, nasopharyngeal cancer, colon cancer, brain tumors and other diseases. Formaldehyde is one of the main pollutant gases in indoor air. [0003] At present, the methods for detecting formaldehyde i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 储向峰白林山张俊李学
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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