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Ethanol gas sensor based on zinc ferrite nano-sensitive material and preparation method thereof

A gas sensor and sensitive material technology, applied in the fields of nanotechnology, nanotechnology, analytical materials, etc. for materials and surface science, it can solve the problems of gas-sensing performance differences such as sensitivity, selectivity, and working temperature, and achieve improved gas sensitivity. The effect of sensitive performance, simple method and easy availability of raw materials

Inactive Publication Date: 2018-12-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The type of organic ligands, the amount of additives, and the temperature class of material synthesis lead to significant differences in gas-sensing properties such as sensitivity, selectivity, and operating temperature.

Method used

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  • Ethanol gas sensor based on zinc ferrite nano-sensitive material and preparation method thereof
  • Ethanol gas sensor based on zinc ferrite nano-sensitive material and preparation method thereof
  • Ethanol gas sensor based on zinc ferrite nano-sensitive material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of the ethanol gas sensor based on the zinc ferrite nano-sensitive material comprises the following steps:

[0026] (1) Preparation of precursor Zn, Fe-MOF nanomaterials

[0027] Zinc nitrate hexahydrate (74.4 mg), ferric nitrate nonahydrate (202 mg), fumaric acid (928.6 mg) were dissolved in 10 mL N,N-dimethylformamide (DMF) solution and sonicated until uniform. Stir the above mixture at room temperature for 10 minutes, then transfer the obtained solution to a 20mL reactor and heat at 100°C for 8h, centrifuge the obtained product, wash it with DMF and ethanol successively, and then put it in a vacuum drying oven at 60°C After drying for 8 hours, the precursor Zn,Fe-MOF nanomaterials were obtained. The morphology of the obtained Zn, Fe-MOF nanomaterials was characterized by scanning electron microscopy. Such as figure 1 As shown, the obtained Zn, Fe-MOF nanomaterials have a spindle structure with a particle size of about 200nm.

[0028] (2) Pr...

Embodiment 2

[0036] (1) The steps for preparing Zn, Fe-MOF nanomaterials are the same as in Example 1.

[0037] (2) Preparation of ZnFe 2 o 4 nanomaterials

[0038] The Zn, Fe-MOF nanomaterial (100 mg) obtained in Example 1 was put into a crucible, placed in a muffle furnace, and calcined at a high temperature in an air atmosphere. The calcination temperature is 550°C, the heating rate is 1°C / min, and the calcination time is 2h. ZnFe 2 o 4 The structure and morphology of the nanomaterials are similar to those in Example 1.

[0039] (3) The steps of preparing the ethanol gas sensor are the same as those in Example 1.

Embodiment 3

[0041] (1) Preparation of Zn, Fe-MOF nanomaterials

[0042] At room temperature, zinc nitrate hexahydrate (82mg), ferric nitrate hexahydrate (130mg), fumaric acid (935mg) were dissolved in 12ml N,N-dimethylformamide DMF, and the mixed solution was sonicated until uniform. Move the homogeneous solution into a reaction kettle, heat and react at 120°C for 7 hours, then cool to room temperature, wash the obtained product with DMF and ethanol several times, put it in a vacuum box, and dry it at 80°C for 6 hours. Obtain the precursor material.

[0043] (2) Preparation of ZnFe 2 o 4 nanomaterials

[0044] The obtained Zn, Fe-MOF nanomaterial (100 mg) was put into a crucible, placed in a muffle furnace, and calcined at a high temperature in an air atmosphere. The calcination temperature is 350°C, and the calcination time is 6h. ZnFe 2 o 4 The structure and morphology of the nanomaterials are similar to those in Example 1.

[0045] (3) The steps of preparing the ethanol gas sen...

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Abstract

Belonging to the technical field of oxide semiconductor gas sensors, the invention provides an ethanol gas sensor based on a zinc ferrite nano-sensitive material and a preparation method thereof. Thepreparation method includes: taking a zinc salt, an iron salt, an organic ligand and an organic solvent as the raw materials, subjecting the mixture to ultrasonic dispersion, then carrying out solvothermal reaction, and conducting washing, drying and high-temperature calcinations on the product to obtain a hollow spindle structure zinc ferrite nano-sensitive material; and finally, constructing theethanol gas sensor with the zinc ferrite nano-sensitive material. The invention has the beneficial effects that: the raw materials are easily available, the cost is low and the method is simple; thezinc ferrite nano-sensitive material is a hollow structure, has a high specific surface area and has abundant oxygen adsorption functional groups on the surface, and can improve the gas sensitive performance of the material; the ethanol gas sensor has low working temperature, and is a low energy consumption ethanol gas sensor.

Description

technical field [0001] The invention belongs to the technical field of oxide semiconductor gas sensors, and relates to a ZnFe sensor based on a hollow spindle structure 2 o 4 Ethanol gas sensor of nano sensitive material and preparation method thereof. Background technique [0002] As a flammable and volatile colorless transparent liquid, ethanol is widely used in people's life, national defense chemical industry, medical and health care, food industry, industrial and agricultural production. Its vapor easily forms explosive mixtures with air. In addition, the alcohol breath detection analyzer based on the ethanol sensor gradually replaces the traditional method to identify drunk driving, so as to avoid casualties and property losses. Therefore, in order to prevent various accidents, it is very necessary to monitor and alarm ethanol in time and accurately. Currently existing ethanol sensors mainly include fuel cell type (catalytic combustion type), metal oxide semiconduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12B82Y30/00
CPCG01N27/127B82Y30/00
Inventor 王小风孙凯铭宋学志田帅谷弘志
Owner DALIAN UNIV OF TECH
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