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Co-doped SnO2 formaldehyde-acetone gas sensor and preparation method thereof

A gas sensor and formaldehyde technology, applied in the direction of instruments, scientific instruments, air quality improvement, etc., can solve the problem of increasing the number of sensors, and achieve the effects of reduced diffusion resistance, low cost, and simple steps in the preparation method

Active Publication Date: 2021-08-06
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the selective detection of a specific VOC gas by a single high-performance sensor can be achieved through the above strategies, the increase in the number of sensors is inevitable when detecting various indoor VOC gases

Method used

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  • Co-doped SnO2 formaldehyde-acetone gas sensor and preparation method thereof
  • Co-doped SnO2 formaldehyde-acetone gas sensor and preparation method thereof
  • Co-doped SnO2 formaldehyde-acetone gas sensor and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0047] Co doping SnO with three-dimensional inverse opal structure 2 Nano-sensitive material gas sensor, its specific production process is as follows:

[0048] (1) First, add 0.3 g of sodium polystyrene sulfonate, 0.25 g of sodium bicarbonate, and 30 mL of styrene into 300 mL of deionized water in sequence, and heat in a water bath under a nitrogen atmosphere (nitrogen flow rate: 50 sccm) (water bath heating temperature : 80°C) stirring. After stirring for 1 h, add 0.15 g of potassium persulfate, and continue stirring in a water bath (water bath heating temperature: 80° C.) under a nitrogen atmosphere (nitrogen flow rate: 50 sccm) for 20 h;

[0049] (2) After the reaction, the obtained product was alternately centrifuged and washed 5 times with water and ethanol, and the obtained product was dried in a 60° C. oven for 12 hours to obtain polystyrene microsphere powder;

[0050] (3) the polystyrene microsphere powder that 0.6g step (2) obtains, the SnCl of 0.25g 4 ·5H 2 O, ...

Embodiment 2

[0055] Co doping SnO with three-dimensional inverse opal structure 2 Nano-sensitive material gas sensor, its specific production process is as follows:

[0056] (1) First, add 0.3 g of sodium polystyrene sulfonate, 0.25 g of sodium bicarbonate, and 30 mL of styrene into 300 mL of deionized water in sequence, and heat in a water bath under a nitrogen atmosphere (nitrogen flow rate: 50 sccm) (water bath heating temperature : 80°C) stirring. After stirring for 1 h, add 0.15 g of potassium persulfate, and continue stirring in a water bath (water bath heating temperature: 80° C.) under a nitrogen atmosphere (nitrogen flow rate: 50 sccm) for 20 h;

[0057] (2) After the reaction, the obtained product was alternately centrifuged and washed 5 times with water and ethanol, and the obtained product was dried in a 60° C. oven for 12 hours to obtain polystyrene microsphere powder;

[0058] (3) the polystyrene microsphere powder that 0.6g step (2) obtains, the SnCl of 0.25g 4 ·5H 2 O, ad...

Embodiment 3

[0063] Co doping SnO with three-dimensional inverse opal structure 2 Nano-sensitive material gas sensor, its specific production process is as follows:

[0064] (1) First, add 0.3 g of sodium polystyrene sulfonate, 0.25 g of sodium bicarbonate, and 30 mL of styrene into 300 mL of deionized water in sequence, and heat in a water bath under a nitrogen atmosphere (nitrogen flow rate: 50 sccm) (water bath heating temperature : 80°C) stirring. After stirring for 1 h, add 0.15 g of potassium persulfate, and continue stirring in a water bath (water bath heating temperature: 80° C.) under a nitrogen atmosphere (nitrogen flow rate: 50 sccm) for 20 h;

[0065] (2) After the reaction, the obtained product was alternately centrifuged and washed 5 times with water and ethanol, and the obtained product was dried in a 60° C. oven for 12 hours to obtain polystyrene microsphere powder;

[0066] (3) the polystyrene microsphere powder that 0.6g step (2) obtains, the SnCl of 0.25g 4 ·5H 2 O, ...

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Abstract

The invention discloses a formaldehyde-acetone dual-mode gas sensor of a Co-doped SnO2 nano sensitive material and a preparation method thereof, and belongs to the technical field of gas sensors. The outer surface of the ceramic tube is provided with a gold electrode, and the outer surface of the ceramic tube is coated with the Co-doped SnO2 nano sensitive material with the three-dimensional inverse opal structure. According to the sensitive material, sodium polystyrene sulfonate, sodium bicarbonate and styrene are used as raw materials, water is used as a solvent, potassium persulfate is used as an initiator, and polystyrene microspheres are prepared in a water bath; then, a three-dimensional opal structure formed by self-assembly of polystyrene microspheres is used as a hard template, diluted hydrochloric acid and a hydrogen peroxide aqueous solution are used as solvents, cobalt nitrate hydrate and tin chloride hydrate are used as raw materials, ultrasonic atomization deposition is performed, finally, sintering is performed in air, and the polystyrene microsphere template is removed. The sensor disclosed by the invention has a wide application prospect in the field of dual-mode detection of indoor VOCs, and in-situ selective detection of different VOC gases can be realized by changing the working temperature.

Description

technical field [0001] The invention belongs to the technical field of semiconductor oxide gas sensors, in particular to a Co-doped SnO sensor based on a three-dimensional inverse opal structure 2 A formaldehyde-acetone dual-mode gas sensor of a nano-sensitive material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of our country's economy, more and more people will choose to use cumbersome and delicate decoration to make the living room comfortable and beautiful. However, what follows is the indoor air pollution caused by interior decoration. Among them, formaldehyde and acetone are common harmful substances, and their health hazards to the human body cannot be underestimated. Therefore, gas detection is particularly important. Among them, the semiconductor metal oxide gas sensor has always been a research hotspot in the field of gas sensors due to its advantages of low price, all solid state, small size, and i...

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 孙鹏陈珂卢革宇刘方猛闫旭刘凤敏粱喜双高原
Owner JILIN UNIV
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