Method for synthesizing ZnO supported Fe2O3 nanoheterostructured gas sensor on basis of MOF (metal-organic framework) template

A nano-heterostructure, gas-sensing element technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve the problem of long response recovery time, high working temperature of gas sensor, low sensitivity, etc. problem, to achieve excellent selectivity and improve the effect of gas sensing performance

Active Publication Date: 2018-12-14
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But traditional α-Fe 2 o 3 Gas sensors have disadvantages such as high working temperature, long response recovery time, and low sensitivity.

Method used

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  • Method for synthesizing ZnO supported Fe2O3 nanoheterostructured gas sensor on basis of MOF (metal-organic framework) template
  • Method for synthesizing ZnO supported Fe2O3 nanoheterostructured gas sensor on basis of MOF (metal-organic framework) template
  • Method for synthesizing ZnO supported Fe2O3 nanoheterostructured gas sensor on basis of MOF (metal-organic framework) template

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Weigh 0.116 g of fumaric acid and dissolve in 10 mL of deionized water, stir for 1 h at room temperature, add 0.27 g of ferric chloride hexahydrate, stir for 30 min, and put it in the reactor at 100°C for 12 h; after the reaction is complete After natural cooling to room temperature, wash the precipitate with absolute ethanol and deionized water for 5 times, and finally collect the solid product MIL-88A by centrifugation; after drying, the product is placed in a muffle furnace and calcined at a constant temperature of 500℃ for 2 h, and the heating rate is set Is 1℃ / min, and finally α-Fe is obtained 2 O 3 Nanorod, marked as S5;

[0025] (2) Porous α-Fe prepared in step (1) 2 O 3 Nanorods are used as the substrate and methanol and water are used as a mixed solvent to combine porous α-Fe 2 O 3 The nanorods were immersed in a solution containing zinc acetate and a solution containing fumaric acid successively. The specific process is as follows: Weigh 0.020 g α-Fe 2 O 3 Put...

Embodiment 2

[0029] Repeat the soaking process and solvothermal reaction described in step (2) once for the powder obtained by centrifugation after step (2) solvothermal reaction in Example 1 (that is, the number of soaking and solvothermal reactions is increased to 2), and the remaining steps are the same as the implementation Example 1 is the same; the obtained Zn-MOF / α-Fe 2 O 3 The powder is labeled B2, and the final sample after calcination is labeled S2.

Embodiment 3

[0031] Repeat the soaking process and solvothermal reaction described in step (2) for the powder obtained by centrifugation after step (2) solvothermal reaction in Example 1 (that is, the number of soaking and solvothermal reactions is increased to 3), and the remaining steps are the same as the implementation Same as Example 1; the resulting Zn-MOF / α-Fe 2 O 3 The powder is labeled B3, and the final sample after calcination is labeled S3.

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Abstract

The invention discloses a method for synthesizing a ZnO supported Fe2O3 nanoheterostructured gas sensor on the basis of an MOF (metal-organic framework) template. The method comprises the following steps: (1) an MIL-88A nanorod is obtained with a solvothermal method and sintered, and a porous alpha-Fe2O3 nanorod is obtained; (2) the porous alpha-Fe2O3 nanorod is taken as a substrate, zinc acetatedihydrate is taken as a reaction raw material, fumaric acid is taken as a ligand, methanol and water are taken as a mixed solvent, and soaking is performed multiple times; (3) after a solvothermal reaction, Zn-MOF/alpha-Fe2O3 powder is obtained by centrifugation, washing and drying and is calcined, and ZnO/alpha-Fe2O3 heterostructured nanopowder is obtained; (4) the gas sensor is prepared. The nanoheterostructured material is synthesized successfully with MOFs as a template, the prepared gas sensor is a practical semiconductor type gas sensor with high sensitivity, good stability and low cost,and one new idea is provided for synthesis of LDO (layered double oxide) nanoheterostructures.

Description

Technical field [0001] The invention belongs to the technical field of preparation of nano-functional materials, and specifically relates to a method for synthesizing a ZnO-loaded iron trioxide nano heterostructure gas sensor based on a MOF template. Background technique [0002] In recent years, my country’s environmental pollution problems have become more and more serious, mainly involving air pollution, soil pollution, water pollution, etc., among which air pollution has increasingly affected our travel and health. In the 21st century, with the progress of human culture and the rapid development of industry, people's living standards have also made a qualitative leap. Nowadays, the number of private cars in our country has reached an alarming number, and a steady stream of car exhaust is also continuously emitted into the air. Among them, the pollutants emitted by cars mainly include carbon monoxide, formaldehyde, nitric oxide, sulfides, and hydrocarbons. Wait. Their harm t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00G01N27/127
Inventor 贾潇刘荣王治伟丁豪
Owner FUZHOU UNIV
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