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Formaldehyde sensor, and gas-sensitive material, preparation method and application thereof

A gas-sensing material and sensor technology, applied in the analysis of materials, material resistance, material analysis by electromagnetic means, etc., can solve the problems of low operating temperature, poor repeatability, and high operating temperature of sensors, and achieve high sensitivity and low activation energy. , the effect of large specific surface area

Pending Publication Date: 2019-11-05
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been verified by experiments that the sensor of the present invention has low operating temperature, high sensitivity, and strong repeatability; it has improved the existing metal oxide semiconductor-based gas sensors with high operating temperature, low sensitivity, and poor repeatability.

Method used

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  • Formaldehyde sensor, and gas-sensitive material, preparation method and application thereof
  • Formaldehyde sensor, and gas-sensitive material, preparation method and application thereof
  • Formaldehyde sensor, and gas-sensitive material, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] 1, a kind of preparation method of formaldehyde sensor gas sensitive material, comprises the following steps:

[0056] (1-1) Accurately weigh tin protochloride (SnCl 2 2H 2 O) and sodium citrate (Na 3 C 6 h 5 o 7 2H 2 O) (the consumption of stannous chloride and sodium citrate is respectively 4 and 10mmol), joins in 10ml deionized water, uses magnetic stirrer to stir 40min to obtain uniform mixed solution.

[0057] (1-2) Disperse 15 mg of graphene oxide (GO) into 30 ml of N,N-dimethylformamide (DMF) solution and sonicate for 20-30 min to obtain a 0.5 mg / ml GO dispersion.

[0058] (1-3) Add the above-mentioned GO dispersion liquid to the mixed solution obtained in the step (1-1) (the amount of GO dispersion liquid is 1.5 ml), and stir magnetically for 20 min.

[0059] (1-4) Add 0.08g of sodium hydroxide (NaOH) into 10ml of deionized water to obtain a sodium hydroxide solution, then add it to the above mixed solution, and stir magnetically for 40 minutes to obtain ...

Embodiment 2

[0069] 1, a kind of preparation method of formaldehyde sensor gas sensitive material, comprises the following steps:

[0070] (1-1) Accurately weigh stannous chloride (SnCl 2 2H 2 O) and sodium citrate (Na 3 C 6 h 5 o 7 2H 2 O) (the consumption of stannous chloride and sodium citrate is 4 and 8mmol respectively), joins in 20ml deionized water, uses magnetic stirrer to stir 30min to obtain uniform mixed solution.

[0071] (1-2) Disperse 10 mg of graphene oxide (GO) into 25 ml of deionized water and sonicate for 20 min to obtain a 0.4 mg / ml GO dispersion.

[0072] (1-3) Add the above-mentioned GO dispersion liquid to the mixed solution obtained in the step (1-1) (the amount of GO dispersion liquid is 1.5 ml), and stir magnetically for 30 min.

[0073] (1-4) Add 0.16g of sodium hydroxide (NaOH) to 20ml of deionized water to obtain a sodium hydroxide solution with a concentration of 0.2M, then add it to the above mixed solution, and stir magnetically for 30 minutes to obtai...

Embodiment 3

[0083] 1, a kind of preparation method of formaldehyde sensor gas sensitive material, comprises the following steps:

[0084] (1-1) Accurately weigh stannous chloride (SnCl 2 2H 2 O) and sodium citrate (Na 3 C 6 h 5 o 7 2H 2 O) (the consumption of stannous chloride and sodium citrate is 4 and 12mmol respectively), joins in 10ml deionized water, uses magnetic stirrer to stir 30-60min to obtain uniform mixed solution.

[0085] (1-2) Disperse 18 mg of graphene oxide (GO) into 30 ml of ethanol solution and sonicate for 30 min to obtain a 0.6 mg / ml GO dispersion.

[0086] (1-3) Add the above-mentioned GO dispersion liquid to the mixed solution obtained in the step (1-1) (the amount of GO dispersion liquid is 1.5 ml), and stir magnetically for 30 min.

[0087] (1-4) Add 0.08g of sodium hydroxide (NaOH) into 10ml of deionized water to obtain a sodium hydroxide solution, then add it to the above mixed solution, and stir magnetically for 30 minutes to obtain a uniform mixed solu...

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Abstract

The invention relates to a formaldehyde sensor, and a gas-sensitive material, a preparation method and application thereof, and belongs to the technical field of gas sensors. The gas-sensitive material is composed of Sn3O4 and rGO, Sn3O4 nanosheets are staked to form a three-dimensional flower-shaped structure, rGO is positioned on the Sn3O4 nanosheets to form a Sn3O4-rGO heterojunction gas-sensitive material, and the heterojunction is a p-n junction. The formaldehyde sensor uses the flower-shaped Sn3O4-rGO heterojunction as the gas-sensitive material, and the gas sensor of an indirectly heating structure can be used to effectively solve the problems including high operation temperature and low sensitivity, selectivity and repeatability of a traditional gas sensor.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to a gas-sensitive material for a formaldehyde sensor, a sensor, a preparation method and an application thereof. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] To meet the requirements of environmental gas monitoring and industrial gas analysis, researchers have studied various gas sensors for detecting toxic and harmful gases, such as nitrogen oxides, carbon oxides, sulfides, and volatile organic compounds. As one of the most common volatile organic compounds, formaldehyde plays an increasingly important role in fields such as chemistry, biology and textile i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 李阳殷菲菲张春伟岳文静高嵩
Owner UNIV OF JINAN