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Preparation method of a novel gas-sensing material and application of the gas-sensing material

A technology of gas-sensing materials and composite materials, applied in the field of preparation of new gas-sensing materials, to achieve the effect of less equipment, strong stability and good selectivity

Active Publication Date: 2020-04-07
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it also poses a security risk

Method used

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  • Preparation method of a novel gas-sensing material and application of the gas-sensing material
  • Preparation method of a novel gas-sensing material and application of the gas-sensing material
  • Preparation method of a novel gas-sensing material and application of the gas-sensing material

Examples

Experimental program
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Effect test

Embodiment 1

[0018] 1. Preparation of Fe 3 o 4 @SiO 2 Material

[0019] 1) Prepare 1mol / L NaOH solution: Weigh 0.8g of NaOH powder into a 25ml measuring cylinder, then add 20ml of deionized water, and stir evenly;

[0020] 2) Weigh 1.6g of FeCl 3 ﹒ 6H 2 0 and 1.7g FeSO 4 ﹒ 7H 2 O in a 50ml beaker, then add 30ml of water, put in a magnetic stirrer, stir on a multi-head magnetic stirrer for 30min to obtain solution A;

[0021] 3) After reacting for 30min, add the NaOH solution described in step 1) dropwise to solution A, solution A gradually turns black, continue to add dropwise until the pH of the solution=11, then add 0.28g of trisodium citrate dihydrate, Raise the temperature to 80°C, and continue stirring for 1 hour to react; after the reaction, centrifugally dry to obtain ferric oxide;

[0022] 4) Weigh 0.1 g of ferric oxide prepared in step 3), and dissolve it in 20 ml of deionized water, then add 80 ml of ethanol and 1 ml of ammonia water, mix well, pour into a single-necked...

Embodiment 2

[0033] 1. Preparation of NiFe 2 o 4 @SiO 2 Material

[0034] 1) Weigh 0.28g of FeCl 3 ﹒ 6H 2 O, 0.15g Ni(NO 3 ) 2 ﹒ 6H 2 O and 0.5 g of CH 3 After COONa, pour into the beaker;

[0035] 2) Measure 15mL of deionized water and 15mL of ammonia water (25%) into the above-mentioned beaker respectively; place the beaker on a magnetic stirrer and perform magnetic stirring until completely dissolved to obtain solution B;

[0036] 3) Weigh 0.35g of PAM powder and add it into solution B, and continue magnetic stirring until a dark brown gelled substance appears;

[0037] 4) Pour the gelled substance in the beaker in step 3) into the inner kettle of the reactor, and react at 180°C for 12 hours. After the reaction is complete, the reactor is naturally cooled to room temperature. After the reactor is opened and the inner kettle is taken out, the precipitate is centrifuged, and then After washing several times with deionized water and ethanol, dry in a constant temperature drying...

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Abstract

The invention relates to a preparation method of a novel gas sensitive material and application of the gas sensitive material. The preparation method comprises the following steps: synthesizing ferroferric oxide (Fe3O4) through a co-precipitation method or preparing nickel ferrite (NiFe2O4) through an improved hydrothermal method; then correspondingly wrapping the surfaces with porous silicon dioxide through a sol-gel method so as to obtain Fe3O4@SiO2 or NiFe2O4@SiO2 novel gas sensitive material. The MFe2O4@SiO2 (M=iron or nickel) composite material prepared by the method has the characteristics of being high in ethyl alcohol sensitivity, and outstanding in selecting performance.

Description

technical field [0001] The invention relates to a preparation method of a novel gas-sensitive material and an application of the gas-sensitive material, belonging to the technical field of material engineering. Background technique [0002] With the vigorous development of the automobile industry and the rapid improvement of people's living standards, family cars have become the means of transportation for every household, which provides convenience for people to travel. However, it also poses a security risk. According to statistics, more than half of traffic accidents are related to drunk driving. Therefore, the detection of ethanol gas is particularly important. Therefore, how to develop new gas-sensing materials with higher sensitivity and excellent selectivity to ethanol is a technical problem to be solved by those skilled in the art. [0003] Good gas-sensing materials are the key to realize gas detection. Spinel type composite oxide is a kind of more important met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 王红林果龚敏杨瑞嵩
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING