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Tin-doped layered porous nanometer zinc oxide as well as preparation method and application thereof

A nano-zinc oxide and tin-doped technology, which is applied in the field of gas-sensitive sensors, can solve problems such as not being able to meet the detection requirements of benzene series, achieve excellent gas-sensing performance, simple method, and improve the effect of surface reaction performance

Active Publication Date: 2014-03-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the performance of the gas-sensing materials used in the currently prepared VOCs gas sensors and reported in the literature has been improved to a certain extent, they are still limited to the optimization of a single unit and cannot meet the requirements for the benzene series in VOCs in real life. Especially the detection requirements for benzene gas, which is difficult to detect and has carcinogenic effects (requires the minimum detection concentration to be at the ppb level)

Method used

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  • Tin-doped layered porous nanometer zinc oxide as well as preparation method and application thereof
  • Tin-doped layered porous nanometer zinc oxide as well as preparation method and application thereof

Examples

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preparation example Construction

[0019] Preparation of tin-doped layered porous nano-zinc oxide: Weigh zinc salts (zinc acetate, zinc sulfate) and dissolve them in water, add stannous chloride at a ratio of 0.1-22.0 at.% and stir to form a white emulsion, slowly add Polyol (such as ethylene glycol, glycerol, 1,2-propanediol, 1,4-butanediol) until a translucent light white mixture is formed, the volume ratio of water to polyol is 1:1-1:6 . Transfer the mixed liquid into a reaction kettle, seal the reaction kettle and heat the hydrothermal reaction. The reaction temperature is 120-200° C., and the reaction time is 12-84 hours. After the reaction, the liquid and solid of the reaction product are separated, and the solid product is washed and dried.

[0020] Characterization of tin-doped layered porous nano-zinc oxide: The morphology of the sample was observed by transmission electron microscope (TEM, JEOL JEM-2100).

[0021] Tin-doped layered porous nano-zinc oxide gas-sensing performance test: The substrate of...

Embodiment 1

[0023] Weigh zinc acetate and add water to dissolve, add stannous chloride according to the ratio of 0.1at.% and stir to form a white emulsion, slowly add ethylene glycol until a translucent light white mixed solution is formed, the volume ratio of water and ethylene glycol is 1:1. Transfer the mixed solution into a reaction kettle, seal the reaction kettle and heat it for hydrothermal reaction. The reaction temperature is 120° C., and the reaction time is 12 hours. After the reaction is completed, the liquid and solid of the reaction product are separated, and the solid product is washed and dried.

Embodiment 2

[0025] Weigh zinc acetate and add water to dissolve, add stannous chloride according to the ratio of 5.0at.% and stir to form a white emulsion, slowly add glycerol until a translucent light white mixed solution is formed, the volume ratio of water and glycerol is 1:6. Transfer the mixed solution into a reaction kettle, seal the reaction kettle and heat the hydrothermal reaction, the reaction temperature is 200° C., and the reaction time is 12 hours. After the reaction is completed, the liquid and solid of the reaction product are separated, and the solid product is washed and dried.

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Abstract

The invention provides tin-doped layered porous nanometer zinc oxide. The tin-doped layered porous nanometer zinc oxide is characterized in that the tin-doped layered porous nanometer zinc oxide is of a three-dimensional porous layered structure formed by crystal particles and nanopores on the whole, the thickness of each layer of tin-doped layered porous nanometer zinc oxide is about 10-20nm, the length of each layer of tin-doped layered porous nanometer zinc oxide is about 0.8-1.2 micrometers, the width of each layer of tin-doped layered porous nanometer zinc oxide is about 300-700nm, and the tin doping content is 0.1-22.0at.%. A typical preparation method of the tin-doped layered porous nanometer zinc oxide comprises the steps of weighing zinc salt, dissolving the zinc salt by adding water, adding stannous chloride according to proportions, stirring so as to form white emulsion, slowly adding polyhydric alcohols (such as ethylene glycol, glycerol, 1,2-propylene glycol, 1,4-butanediol) till forming semitransparent light white mixed liquid, transferring the mixed liquid to a reaction kettle, sealing the reaction kettle, carrying out thermal reaction by adding hot water, then carrying out solid-liquid separation on a reaction product after the reaction, and washing and drying the solid product. The tin-doped layered porous nanometer zinc oxide provided by the invention has excellent gas-sensitive property for volatile organic compounds, and has the advantages of simple method and low cost.

Description

technical field [0001] The invention relates to the field of gas sensors, in particular to a tin-doped layered porous nano-zinc oxide used for detecting volatile organic compound gas sensors and its preparation method and application. Background technique [0002] Volatile organic compounds (volatile organic compounds, VOCs) refer to various organic compounds with a boiling point of 50°C-260°C at room temperature. According to their chemical structure, VOCs can be further divided into: alkanes, aromatics, esters, aldehydes and others. More than 300 species have been identified so far. The most common ones are benzene, toluene, xylene, styrene, trichloroethylene, chloroform, trichloroethane, diisocyanate (TDI), diisocyanocresyl, etc. When the concentration of volatile organic compounds in the indoor air is too high, it is easy to cause acute poisoning. In mild cases, headache, dizziness, cough, nausea, vomiting, or drunkenness will occur; in severe cases, liver poisoning or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02B82Y30/00G01N27/04
Inventor 袁方利姚明水丁飞陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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