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Gas-sensitive material for detecting acetaldehyde and method for producing gas-sensitive component by utilizing gas-sensitive material

A technology of gas-sensitive materials and gas-sensitive elements, which is applied in the field of gas detection, can solve problems such as high cost and difficult online detection, and achieve the effects of fast response recovery, reduced energy consumption, and low energy consumption

Inactive Publication Date: 2013-11-20
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are colorimetric titration, gas chromatography, high performance liquid chromatography, and spectrophotometry. These methods are limited by regions and instruments, and it is difficult to achieve online detection, and the cost is high.

Method used

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  • Gas-sensitive material for detecting acetaldehyde and method for producing gas-sensitive component by utilizing gas-sensitive material
  • Gas-sensitive material for detecting acetaldehyde and method for producing gas-sensitive component by utilizing gas-sensitive material
  • Gas-sensitive material for detecting acetaldehyde and method for producing gas-sensitive component by utilizing gas-sensitive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of different crystal forms of MnO 2 Nano stave:

[0041] ①α-MnO 2 Nanorods: 0.008mol KMnO 4 and 0.003mol of MnSO 4 ·H 2 O was dissolved in 80 mL ultrapure water, and the mixed solution was transferred to a 100 mL polytetrafluoroethylene autoclave, reacted at 120 °C for 24 h, cooled, filtered the resulting precipitate, washed three times with ultrapure water, Dry under normal pressure to obtain α-MnO 2 Nano stave.

[0042] ②β-MnO 2 Nanorods: 0.006 mol MnSO 4 ·H 2 O and 0.006 mol (NH 4 ) 2 S 2 o 8 Dissolved in 80 mL of ultrapure water, reacted in a 100 mL polytetrafluoroethylene autoclave at 120 °C for 24 h, filtered the resulting precipitate after cooling, washed with ultrapure water, and dried under normal pressure at 80 °C to obtain β-MnO 2 Nano stave.

[0043] ③γ-MnO 2 Nanorods: 0.004 mol MnSO 4 ·H 2 O and 0.008mol (NH 4 ) 2 S 2 o 8 Dissolved in 70 mL of ultrapure water, reacted in a 100 mL polytetrafluoroethylene autoclave at 140°C fo...

Embodiment 2

[0053] α-MnO 2 The preparation method of the nanorods is the same as in Example 1, and the tin dioxide is also an ultrafine nanoparticle prepared by the sol-gel method in the reference.

[0054] A gas-sensitive material for detecting acetaldehyde, comprising α-MnO by mass percentage 2 Nanorod 90.91%, nano SnO 2 was 9.09%.

[0055] The method for making the side-heating type acetaldehyde gas sensor with the above-mentioned gas-sensitive material comprises the following steps:

[0056] (1) The above α-MnO 2 Put 2g of nanorods into the agate mortar, add 0.2g of nano SnO 2 , mixed and ground for 5 min;

[0057] (2) Add 4 g of ethanol to the agate mortar, and after the slurry is ground to dryness, add 4 g of ethanol and stir evenly to obtain a viscous gas-sensitive material;

[0058] (3) Use a screen printing machine to print the viscous sensitive material onto the Al printed with gold interdigitated electrodes 2 o 3 Ceramic plates (Al 2 o 3 ceramic plate), placed in the ...

Embodiment 3

[0063] α-MnO 2 The preparation of nanorods is the same as that in Example 1.

[0064] A gas-sensitive material for detecting acetaldehyde, comprising α-MnO by mass percentage 2 Nanorod 83.34%, nano SnO 2 8.33%, nano ZnO 0.2g.

[0065] The method for making the side-heating type acetaldehyde gas sensor with the above-mentioned gas-sensitive material comprises the following steps:

[0066] (1) Take α-MnO 2 2g of nanorod sensitive material, adding 0.2g of nano-ZnO calcined at 400°C, and preparing SnO by sol-gel method 2 Nanoparticles 0.2g, ground for 5min by agate mortar;

[0067] (2) Add 4.5 g of ethanol to the agate mortar, and after the slurry is ground to dryness, add 4.5 g of ethanol and stir evenly to obtain a viscous gas-sensitive material;

[0068] (3) Use a screen printing machine to print the viscous sensitive material onto the Al printed with gold interdigitated electrodes 2 o 3 Ceramic plates (Al with gold interdigitated electrodes printed on them, washed with...

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Abstract

The invention relates to a gas-sensitive material for detecting acetaldehyde. The gas-sensitive material contains alpha-MnO2 nanorods, wherein the addition amount of the alpha-MnO2 nanorods in the gas-sensitive material is 0.1-100wt%. An acetaldehyde gas-sensitive sensor produced by utilizing the gas-sensitive material is fast in response recovery, high in sensitivity, good in selectivity, and capable of meeting requirements on the acetaldehyde gas-sensitive sensor in foods and environment.

Description

technical field [0001] The invention relates to a gas-sensitive material for detecting acetaldehyde and a method for making a gas-sensitive element with it, belonging to the field of gas detection. Background technique [0002] In recent years, the identification and detection of harmful gases in the air and food have attracted more and more attention. As an air pollutant and carcinogen, acetaldehyde exists widely in various combustion exhaust emissions, food and working environments. [0003] In terms of food detection, acetaldehyde and diacetyl in fermented milk products are the main components of yogurt flavor. The detection of acetaldehyde in fermented milk plays an important role in the development of fermented milk products or the selection of high-quality yogurt. In addition, it is often used in food storage. The role of ethanol and acetaldehyde in the preservation of postharvest horticultural crops. Proper acetaldehyde and ethanol treatment can delay the ripening and...

Claims

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Application Information

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IPC IPC(8): G01N27/00
Inventor 刘善堂刘欢欢宋灿郑第周思良周发武
Owner WUHAN INSTITUTE OF TECHNOLOGY
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