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Preparation method of nickel-ferrite nano material

A technology of nanomaterials and nickel ferrite, which is applied in nanotechnology, material resistance, chemical instruments and methods, etc., can solve problems such as high working temperature requirements, easy phase transition, poor selectivity, etc., and achieve high application value and preparation Simple method, good sensitivity and selectivity effect

Inactive Publication Date: 2018-07-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional metal oxides such as Fe 2 o 3 , ZnO, SnO 2 etc. Although some effects have been achieved as a gas-sensing material, there are various shortcomings, such as γ-Fe 2 o 3 Unstable, prone to phase change, ZnO requires a higher working temperature (400-450°C), SnO 2 poor selectivity, etc.

Method used

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  • Preparation method of nickel-ferrite nano material
  • Preparation method of nickel-ferrite nano material
  • Preparation method of nickel-ferrite nano material

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Preparation of Ni-Fe-MOF Nanomaterials

[0020] Nickel nitrate hexahydrate (14.4 mg), ferric nitrate nonahydrate (29.2 mg), fumaric acid (123.7 mg), polyvinylpyrrolidone (75 mg) were dissolved in a mixed solution of N,N-dimethylformamide and ethanol ( 10mL, V / V=2:1). The above mixture was stirred at room temperature for 10 min, then the obtained solution was transferred to a 20 mL reactor and heated at 120 °C for 12 h, after centrifuging the obtained product, it was dried with DMF and ethanol in a vacuum oven at 60 °C for 8 h successively to obtain Precursor Ni-Fe-MOF nanomaterials.

Embodiment 2

[0022] Preparation of Ni-Fe-MOF Nanomaterials

[0023] Dissolve nickel nitrate hexahydrate (19.2mg), iron nitrate nonahydrate (36.4mg), terephthalic acid (182.6mg), polyvinylpyrrolidone (100mg) in a mixed solution of N,N-dimethylacetamide and ethanol (15mL, V / V=2:1). Stir the above mixture at room temperature for 10 min, then transfer the obtained solution to a 20 mL reaction kettle and heat at 140°C for 8 h, centrifuge the obtained product, centrifuge with DMF and ethanol successively, and dry in a vacuum oven at 80°C for 6 h , to obtain the precursor Ni-Fe-MOF nanomaterials.

[0024] The morphology of the obtained Ni-Fe-MOF nanomaterials was characterized by scanning electron microscopy. Such as figure 1 As shown, the obtained Ni-Fe-MOF nanomaterials have a biconical structure with a particle size of about 1.5 μm.

Embodiment 3

[0026] Preparation of NiFe 2 o 4 nanomaterials

[0027] The Ni-Fe-MOF nanomaterial (20 mg) in Example 1 or Example 2 was put into a crucible, placed in a muffle furnace, and calcined at a high temperature in an air atmosphere. The calcination temperature is 500°C, the heating rate is 1°C / min, and the calcination time is 4h.

[0028] Its structure was analyzed by X-ray diffractometer, such as image 3 As shown, the nanomaterial is NiFe with spinel structure 2 o 4 nanomaterials.

[0029] Characterization of the obtained NiFe by scanning electron microscopy 2 o 4 Morphology of nanomaterials. Such as Figure 4 As shown, the resulting NiFe 2 o 4 The nanomaterial has a biconical structure, and the comparison before and after calcination shows that the material shrinks to a certain extent after calcination, and the aspect ratio increases.

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Abstract

The invention discloses a preparation method of a nickel-ferrite nano material, and belongs to the technical field of preparation of nano materials. The preparation method adopts a solvothermal methodto prepare a metal-organic precursor material, and adopts a high-temperature calcination method to prepare an NiFe2O4 nano material. The preparation method is characterized by comprising the following steps: dissolving nickel nitrate hexahydrate, iron nitrate nonahydrate, fumaric acid and polyvinylpyrrolidone in mixed solution of N,N-dimethyl formamide and alcohol; stirring under a room temperature, transferring the obtained solution into a reaction kettle for heating under a certain temperature condition, centrifugally separating, and carrying out vacuum drying to obtain a precursor Ni-Fe-MOF nano material; carrying out high-temperature calcination at a certain temperature to obtain the NiFe2O4 nano material. The preparation method provided by the invention is simple, environmentally friendly and pollution-free, and has a high practical level; the obtained NiFe2O4 nano material can be directly used as a gas-sensitive material.

Description

technical field [0001] The invention relates to a preparation method of a nickel ferrite nano material, which belongs to the technical field of nano material preparation. Background technique [0002] In recent years, with the intensification of environmental pollution, various toxic and harmful gases have gradually increased. On the other hand, people pay more and more attention to their own health. Therefore, the demand for detection of toxic and harmful gases has also attracted more and more attention. . Metal oxide gas sensors are widely used because of their simple structure, fast response, low price, long service life, and high sensitivity to flammable gases and organic volatile gases. Traditional metal oxides such as Fe 2 o 3 , ZnO, SnO 2 etc. Although some effects have been achieved as a gas-sensing material, there are various shortcomings, such as γ-Fe 2 o 3 Unstable, prone to phase change, ZnO requires a higher working temperature (400-450°C), SnO 2 poor sel...

Claims

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Application Information

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IPC IPC(8): C01G53/00B82Y40/00G01N27/12
CPCC01G53/00B82Y40/00C01P2002/32C01P2002/72C01P2004/03C01P2004/30G01N27/12
Inventor 宋学志孟玉兰孙凯铭王小风
Owner DALIAN UNIV OF TECH
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