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Alpha-Fe2O3 nano microsphere hydrogen sulfide gas-sensing material and preparation of gas-sensing component

A technology of nano-microspheres and hydrogen sulfide gas, which is applied in nanotechnology, analytical materials, material resistance, etc., can solve the problems of high preparation cost and large amount of ionic liquid, and achieve good dispersion, uniform appearance, and fast response-recovery The effect of the characteristic

Active Publication Date: 2019-01-04
QIQIHAR UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As far as ionic liquids are concerned, the amount of ionic liquids used in the preparation of nanomaterials is large, and the high cost of preparation is another problem that needs to be improved urgently.

Method used

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  • Alpha-Fe2O3 nano microsphere hydrogen sulfide gas-sensing material and preparation of gas-sensing component
  • Alpha-Fe2O3 nano microsphere hydrogen sulfide gas-sensing material and preparation of gas-sensing component
  • Alpha-Fe2O3 nano microsphere hydrogen sulfide gas-sensing material and preparation of gas-sensing component

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Embodiment Construction

[0022] First add 2.0 mmol FeCl 3 ·6H 2 O and 0.05-0.1 mmol [C 12 mim][PF 6 ] mixed and dissolved in 35 mL of water, and magnetically stirred for 60 min; the resulting mixture was transferred to a 30-50 mL stainless steel self-pressurized reactor with a polytetrafluoroethylene liner, sealed, and kept at 150-210 °C React for 8-12 hours. Naturally cooled to room temperature and centrifuged to obtain a red iron oxide precursor.

[0023] The precursor was washed several times with ultrapure water and ethanol, and then dried in vacuum at 80 °C for 12 hours. The scanning electron microscope image of the powder is as follows: Figure 1-2 shown. It can be seen from the figure that the precursor is a monodisperse nanosphere with a diameter of about 2 μm, and a rough spherical structure formed by self-assembly and accumulation of nanoparticles with a particle size of 20-100nm.

[0024] The XRD patterns obtained after the precursors were heat-treated at 250, 400 and 600 °C for 2 hou...

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Abstract

The invention relates to a alpha-Fe2O3 nano microsphere hydrogen sulfide gas-sensing material and a preparation method of a gas-sensing component. The method includes the following steps: taking FeCl3.6H2O as a raw material and [C12-2-C12im]Br2 as an auxiliary reagent; preforming reaction in a stainless steel self-pressure reaction kettle by a hydrothermal method under 150-210 DEG C for 8-12 hours,; naturally cooling to room temperature and then centrifuging; washing a product with ethanol and ultrapure water for multiple times respectively; vacuum drying to obtain an a-Fe2O3 nanosphere; and calcining the a-Fe2O3 precursor at 250 DEG C for 2 hours to obtain the a-Fe2O3 nanosphere hydrogen sulfide gas-sensing material. The method of the invention has the beneficial effects that ionic liquidGemini imidazole surfactant ([C12-2-C12im]Br2) is adopted for the first time for assisted synthesis of the alpha-Fe2O3 nano microsphere hydrogen sulfide gas-sensing material with a self-assembled porous structure, which opens up a brand-new way for the development and real-time detection of new harmful gas gas-sensing materials.

Description

technical field [0001] The present invention relates to a kind of α-Fe 2 o 3 The nano microsphere hydrogen sulfide gas sensitive material, and the invention also relates to a method for making a gas sensitive element by using the gas sensitive material. Background technique [0002] Hydrogen sulfide (H 2 S) is a flammable, soluble and highly toxic gas. After inhalation, it can pass through the cell membrane and combine with iron in mitochondrial cytochrome enzymes to form a complex, which will block the respiration of cells and cause acute poisoning and chronic damage. Low concentrations of hydrogen sulfide in industrial production not only endanger the lives of workers but also cause explosions. Therefore, realizing the early identification and real-time detection of hydrogen sulfide gas is an important means to ensure personal safety and prevent industrial accidents. [0003] At present, the common detection methods of hydrogen sulfide gas include chromatography, spect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B82Y40/00G01N27/12
CPCB82Y40/00C01G49/06C01P2002/72C01P2004/03C01P2004/32C01P2004/45C01P2004/61C01P2004/64G01N27/127
Inventor 王平于海霞徐蕾隋丽丽郭祥峰贾丽华
Owner QIQIHAR UNIVERSITY
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