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Preparation method of zinc ferrite/tin dioxide composite nano material with good gas-sensitive response to acetone gas

A technology of composite nanomaterials and tin dioxide, which is applied in the field of gas-sensing sensing materials, can solve problems such as damage to the central nervous system, and achieve the effects of lowering working temperature, good gas-sensing performance, and improving the degree of gas-sensing response.

Pending Publication Date: 2019-09-17
ANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is easy to volatilize, and long-term exposure to acetone atmosphere can cause damage to the human central nervous system

Method used

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  • Preparation method of zinc ferrite/tin dioxide composite nano material with good gas-sensitive response to acetone gas
  • Preparation method of zinc ferrite/tin dioxide composite nano material with good gas-sensitive response to acetone gas
  • Preparation method of zinc ferrite/tin dioxide composite nano material with good gas-sensitive response to acetone gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Weigh 6.010g of zinc nitrate hexahydrate and 16.490g of iron nitrate nonahydrate, and dissolve them in deionized water in turn to form A solution;

[0045] (2) Weigh 13.902g of anhydrous citric acid and fully dissolve it in solution A;

[0046] (3) Constantly stir and sonicate solution A for 30 minutes, and add 2 g of polyethylene glycol (PEG);

[0047] (4) At the same time, use ammonia water to adjust the pH of the solution to 7, place it in an 80°C water bath and stir, stop stirring after 6-8 hours to form a gel, and continue heating for 48 hours;

[0048] (5) Pass the obtained xerogel through an electric furnace at a temperature of 500°C to fully remove organic matter to obtain ZFO precursor powder;

[0049] (6) The obtained ZFO precursor powder is fully ground and placed in a muffle furnace, heated to 600°C at a rate of 10°C / min for calcination for 2 hours, and then annealed at a rate of 10°C / min to 200°C to form ZFO nanopowder sample, figure 1 It shows that ...

Embodiment 2

[0062] The difference between this example and Example 1 is that the composite molar ratio of zinc ferrite to tin dioxide is different (ZFO / SO=1:1). The gas sensitivity test found that compared with Example 1, the best response value of the sample to 100ppm acetone gas was 9.72, and the best working temperature was increased.

Embodiment 3

[0064] The difference between this example and Example 1 is that the composite molar ratio of zinc ferrite to tin dioxide is different (ZFO / SO=1:2). After the gas sensitivity test, it is found that compared with Example 1, the gas sensitivity performance of the sample is reduced, and the best response value for 100ppm acetone gas is 8.58.

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Abstract

The invention relates to a preparation method of a zinc ferrite / tin dioxide composite nano material with good gas-sensitive response to acetone gas, belonging to the technical field of gas-sensitive sensing materials, and aiming at solving the problems that the gas-sensitive response value of zinc ferrite needs to be improved and the working temperature of a semiconductor metal oxide is high. The method comprises the following steps: adopting a sol-gel method under the conditions of taking ferric nitrate and zinc nitrate as raw materials and using deionized water as a solvent, and adjusting the pH value of the solution with ammonia water to finally obtain a ZnFe2O4 nano powder sample; using the sol-gel method under the conditions of taking stannous chloride as a raw material and using the deionized water as the solvent to finally obtain SnO2 a nano powder sample; weighing ZFO and SO powder according to a molar ratio, mixing, grinding and calcining again at a high temperature to obtain the ZFO / SO composite material. Compared with the traditional gas-sensitive material, the material prepared by the method has an excellent acetone gas-sensitive property, thus being wide in application prospect; the preparation process is simple to operate; the obtained material has an important gas-sensitive application value.

Description

technical field [0001] The invention belongs to the technical field of gas-sensing sensing materials, and in particular relates to a preparation method of a zinc ferrite / tin dioxide composite nanomaterial with good gas-sensing response to acetone gas. Background technique [0002] Recently, due to the needs of environmental monitoring, industrial development, and medical diagnosis, the development of gas sensor technology has received more and more attention. Zinc ferrite material has the characteristics of fast response / recovery, and can quickly detect the gas to be measured, but its gas sensitivity response value needs to be further improved. Traditional semiconducting metal oxides (such as SnO 2 ) has the characteristics of high gas sensitivity response, wide application range and high working temperature. Therefore, zinc ferrite and tin dioxide are simply compounded to achieve the goal of improving the gas-sensing response and reducing the working temperature. [0003...

Claims

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Application Information

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IPC IPC(8): C01G49/00C01G19/02B82Y30/00B82Y40/00G01N27/04G01N27/12
CPCB82Y30/00B82Y40/00C01G19/02C01G49/00C01P2004/82G01N27/04G01N27/127
Inventor 鞠林刘晨徐同帅
Owner ANYANG NORMAL UNIV
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