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Micron tin dioxide gas sensing material and preparation method and application thereof

A technology of tin dioxide and gas-sensitive materials, which is applied in the fields of analysis of materials, material resistance, and material analysis through electromagnetic means, which can solve the problems of multiple raw materials and human health, slow response and recovery time, and complicated preparation processes. Achieve the effect of simple and easy process, low preparation cost and good repeatability

Active Publication Date: 2019-04-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although SnO with different morphologies and micro-nano structures doped with different metals and metal oxides has been prepared by the above method, 2 Gas sensor, its gas sensing performance is better than traditional SnO 2 The gas sensor has been greatly improved, but there are still some problems, such as poor selectivity, low working temperature, slow response and recovery time, and complicated preparation process, many selected raw materials are harmful to the environment and human health, therefore, How to improve the selectivity and sensitivity of carbon dioxide to gas, reduce the working temperature, and optimize the preparation process are still hot research topics in the future.

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  • Micron tin dioxide gas sensing material and preparation method and application thereof
  • Micron tin dioxide gas sensing material and preparation method and application thereof
  • Micron tin dioxide gas sensing material and preparation method and application thereof

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preparation example Construction

[0036] A kind of preparation method of micron-scale tin dioxide gas sensitive material of the present invention, comprises the following steps:

[0037] S1, placing 1 to 2 mmol of tin dichloride in a certain amount of ethanol solvent, the amount of ethanol solvent being 70 to 80% of the capacity of the reactor, configured into a solution;

[0038] S2. Transfer the solution prepared in step S1 to the reaction kettle, raise the temperature to 160-240°C at a heating rate of 5-10°C / min, and then keep it warm for 4-8 hours. During this process, the solution reacts. After the reaction is completed , to obtain a mixed solution containing solid tin dioxide;

[0039] Preferably, the set temperature of the reaction kettle is 180-220°C.

[0040] S3. Take out the mixed solution containing solid tin dioxide from the reaction kettle, transfer it to a centrifuge tube for centrifugation, the centrifugation rate is 5000~10000r / min, the time is 3~6min, and the number of times is 2~4 times. Ob...

Embodiment 1

[0044] Weigh 1mmol of tin dichloride and dissolve it in 30mL of absolute ethanol, stir until dissolved to obtain a clear and transparent solution;

[0045] Then transfer the transparent solution to the reaction kettle, then put the reaction kettle into an oven for heating, heat the reaction kettle to 220°C, and then keep it warm for 6 hours. The heating process of the reaction kettle is from room temperature to 5°C / min heating rate to 160°C;

[0046] In the above process, the tin dichloride in the transparent solution reacts chemically in absolute ethanol to generate a mixed solution containing solid tin dioxide;

[0047] After reaching the holding time, the reaction kettle was naturally cooled to room temperature, and the mixed solution was taken out from the reaction kettle, and placed in a centrifuge for centrifugation. Wherein, the centrifugal speed of the centrifuge was set to 8000r / min, the centrifugation time was 3min, and the number of centrifugations was 3 times;

...

Embodiment 2

[0050] Weigh 1mmol of tin dichloride and dissolve it in 35mL of absolute ethanol, stir until dissolved, and obtain a clear and transparent solution;

[0051] Then transfer the transparent solution to the reaction kettle, then put the reaction kettle into the oven for heating, heat the reaction kettle to 200°C, and then keep it warm for 6 hours. The heating process of the reaction kettle is from room temperature to 10°C / min heating rate to 240°C;

[0052] In the above process, the tin dichloride in the transparent solution reacts chemically in absolute ethanol to generate a mixed solution containing solid tin dioxide;

[0053] After reaching the holding time, the reaction kettle was naturally cooled to room temperature, and the mixed solution was taken out from the reaction kettle, and placed in a centrifuge for centrifugation. Wherein, the centrifugal speed of the centrifuge was set to 5000r / min, the centrifugation time was 6min, and the number of centrifugations was 4 times...

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Abstract

The invention discloses a micron tin dioxide gas sensing material and a preparation method and application thereof, wherein the preparation method includes the following steps: configuring the tin dioxide and ethanol into a solution; then transferring the solution to a reaction kettle, after a certain period of reaction, obtaining a mixed solution containing the solid tin dioxide after the reaction system is cooled; and obtaining light yellow pure phase tin dioxide micron particles by centrifugation and drying. The micron tin dioxide gas sensing material and the preparation method and application thereof provide a new solution and technological process for the green, environmentally friendly and industrialized production of the micron SnO2, and the process of the method is simple and easyto conduct and is sound in repeatability. And the whole reaction system does not have any pollution to the environment, which is a green and environmentally friendly micron powder synthesis process. The gas sensor has strong practicability, good application prospect and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of synthesis of nano-scale gas-sensitive materials and sensors, and in particular relates to a micron-scale tin dioxide gas-sensitive material and its preparation method and application. Background technique [0002] With the advancement of science and technology, people's living standards have gradually improved, but the emissions from industry, agriculture and people's daily activities have also increased. Among these gases, some are flammable and explosive, such as hydrogen, alcohol, and other gases; some are toxic, such as formaldehyde, hydrogen sulfide, carbon monoxide, etc. This is a big problem, which is of great significance to production and life, and the gas sensor plays an indispensable role. [0003] The gas sensor can detect the composition and concentration of the gas, and convert the relevant information into an available output signal, so as to perform the functions of gas detection and alar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127Y02A50/20
Inventor 张荔同若冰郭锐朱建峰
Owner SHAANXI UNIV OF SCI & TECH
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